【Technical Field】
The present invention relates to a manufacturing method of a coal briquette. In detail, the present invention relates to a manufacturing method of a coal briquette that can be manufactured with a low cost while improving cold strength thereof.
【Background Art】
A melting reduction iron-manufacturing process uses a reducing furnace for reducing iron ore and a melter gasifier for melting reduced iron ore. When iron ore is melted in a melter gasifier, coal briquettes as a heat source for melting iron ore are charged into the melter gasifier. At this time, the reduced iron is melted in the melter gasifier, converted into molten iron and slag, and then discharged to the outside. The coal briquettes charged into the melter gasifier form a coal-filled bed. Oxygen is fed through a tuyere installed in the melter gasifier, and then the coal-filled bed is combusted to produce combustion gas. While the combustion gas moves up through the coal-filled bed, the combustion gas is converted into high-temperature reducing gas. The high-temperature reducing gas is discharged to the outside of the melter gasifier, and then, as a reducing gas, is supplied to the reducing furnace.
Generally, a coal briquette is prepared by mixing coal and a binder. In this case, molasses is used as a binder. The ingredients for the molasses vary

depending on where it comes from, and it is difficult to consistently control the ingredients according to a sugar manufacturing process. Therefore, in the case where a coal briquette is prepared by using molasses as a binder, it is difficult to control the quality of the coal briquette. Particularly, in the case of using high moisture molasses, there is a problem in that the quality of the coal briquette is reduced.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
【DISCLOSURE】
【Technical Problem】
The present invention has been made in an effort to provide a manufacturing method of a coal briquette capable of being manufactured with a low cost while having excellent cold strength.
【Technical Solution】
In an exemplary embodiment of the present invention, a manufacturing method of a coal briquette charged to a dome portion of a melter gasifier to be rapidly heated in a molten iron manufacturing device including the melter gasifier charged with reduced iron and a reduction furnace connected to the melter gasifier and providing the reduced iron is provided.
The manufacturing method of the coal briquette according to an exemplary embodiment of the present invention includes: a step of providing

pulverized coal; a step of providing sugar cane syrup; a step of adding the sugar cane syrup and a curing agent to the pulverized coal to provide a mixture; and a step of molding the mixture to provide a coal briquette.
The sugar cane syrup may include sucrose at 50 to 90 weight percent with respect to 100 weight percent of the sugar cane syrup , at least one among carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-) at 1 to 40 weight percent, and a of balance water. In detail, the sugar cane syrup includes sucrose at 65 to 85 weight percent, at least one kind among carbon dioxide (CO2), carbonate (H2CO3), and hydrogen carbonate ion (HCO3-) at 5 to 30 weight percent, and the balance of water. In more detail, the sugar cane syrup includes sucrose at 70 to 78 weight percent, at least one kind among carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-) at 10 to 20 weight percent, and the balance of water.
The sugar cane syrup may further include at least one kind among glucose and fructose at 0.1 to 5 weight percent.
The sugar cane syrup may further include at least one kind among cellulose, lignin, and CaCO3 at 0.1 to 5 weight percent.
The sugar cane syrup may further include at least one kind among paraffin, glycerin, and hexane at 0.01 to 1 weight percent.
The sugar cane syrup may include the water at 8 to 40 weight percent.
The viscosity of the sugar cane syrup may be 100 cP to 10,000 cP.
The step of providing the sugar cane syrup may include: a step of crushing sugar cane while injecting the water; a step of juicing the crushed sugar cane to provide sugar cane juice; a step of adding CO2, and CaO or

Ca(OH)2, into the sugar cane juice; and a step of concentrating the sugar cane juice to manufacture the sugar cane syrup.
The step of providing the sugar cane syrup may further include a step of adding a bubble inhibitor to the sugar cane syrup after forming the sugar cane syrup.
The bubble inhibitor may be at least one kind among paraffin, glycerin, and hexane.
In the step of adding CO2, and CaO or Ca(OH)2, into the sugar cane juice, pH of the sugar cane juice may be 8 to 10.
In the step of providing the mixture, the sugar cane syrup at more than 0 to less than 12 weight percent and the curing agent at 1 weight percent to 6 weight percent with respect to the pulverized coal at 100 weight percent may be added. In detail, in the step of providing the mixture, the sugar cane syrup at 5 to 10 weight percent and the curing agent at 2 to 4 weight percent with respect to the pulverized coal at 100 weight percent may be added.
The curing agent may be at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), calcium carbonate, cement, bentonite, clay, silica, silicate, dolomite, magnesium oxide (MgO), magnesium hydroxide (Mg(OH)2), phosphoric acid, and sulfuric acid.
The curing agent may be at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), magnesium oxide (MgO), and magnesium hydroxide (Mg(OH)2).
The step of adding the sugar cane syrup and the curing agent to the pulverized coal to provide the mixture may include a step of adding the curing

agent to the pulverized coal to provide a first mixture and a step of mixing the first mixture and the sugar cane syrup to provide the mixture.
The step of adding the sugar cane syrup and the curing agent to the pulverized coal to provide the mixture may be carried out by adding the sugar cane syrup and the curing agent to the pulverized coal and mixing them for 5 to 30 minutes.
The cold strength of the coal briquette may be efficiently obtained by using the sugar cane syrup including sucrose and CO2. Further, the coal briquette having the excellent cold strength may be formed with a low cost by using the sugar cane syrup. When including the sugar cane syrup, it is not necessary to repeat an over-saturated concentrate recrystallization process to produce a raw sugar such that the coal briquette can be manufactured inexpensively. In addition, it is easy to preserve the sugar cane syrup for a long time.
【Advantageous Effects】
【Description of the Drawings】
FIG. 1 is a schematic flowchart of a manufacturing method of a coal briquette according to an exemplary embodiment of the present invention.
FIG. 2 is a view showing chemical formulas of components of the sugar cane syrup used in a manufacturing method of a coal briquette of FIG. 1.
FIG. 3 is a schematic view of a manufacturing apparatus to provide the sugar cane syrup of FIG. 1.
FIG. 4 is a schematic view of a molten iron manufacturing device using

a coal briquette manufactured in FIG. 1.
FIG. 5 is a schematic view of another molten iron manufacturing device using a coal briquette manufactured in FIG. 1.
【Mode for Invention】
Terms such as first, second, and third are used for explaining various parts, components, areas, layers, and/or sections, but the present invention is not limited thereto. These terms are used only for distinguishing any part, component, area, layer, or section from other parts, components, areas, layers, or sections. Therefore, a first part, component, area, layer, or section to be described below may be referred to as second part, component, area, layer, or section within the range of the present invention.
The technical terms used in the present invention are only for describing a particular exemplary embodiment, but it is considered that the present invention is not limited thereto. The singular forms used in the present invention include plural forms as long as the phrases do not clearly have a contrary sense. The meaning of "including" used in the specification specifies a specific characteristic, area, integer, step, action, element, and/or component, but it is not considered to eliminate the existence or addition of other characteristics, areas, integers, steps, actions, elements, and/or components.
Unless otherwise defined, all terms including technical terms and scientific terms have the same meanings as those generally understood by a person skilled in the art of the present invention. The terms that are defined in a dictionary and are generally used are not to be interpreted with idealized meanings or overly formal meanings unless the terms are further interpreted

and defined to have meanings corresponding to the related technique documents and the content disclosed herein.
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
FIG. 1 is a schematic flowchart of a manufacturing method of a coal briquette according to an exemplary embodiment of the present invention. The flowchart of the method for manufacturing the coal briquette of FIG. 1 is only for illustrating the present invention, and the present invention is not limited thereto. Therefore, the manufacturing method of the coal briquette can be diversely modified.
As shown in FIG. 1, the manufacturing method of the coal briquette includes i) a step (S10) of providing pulverized coal, ii) a step (S20) of providing a sugar cane syrup, iii) a step (S30) of providing a mixture by adding the sugar cane syrup and a curing agent to the pulverized coal, and iv) a step (S40) of providing a coal briquette by molding the mixture.
First, the pulverized coal is provided in step S10. The pulverized coal is used as a raw coal. Moisture is mixed with the pulverized coal in advance to maintain the amount of moisture included in the pulverized coal to be 3 wt% to 12 wt%. In the case where the amount of moisture mixed in the pulverized coal is controlled in the above-described range, the moisture may close pores in particles of pulverized coal. As a result, the curing agent and the binder to be

mixed in following processes do not penetrate into the particles of the pulverized coal, and thus exist on the outside of the particles of the pulverized coal. Therefore, the particles of pulverized coal are well bound to each other, and thereby hot strength and cold strength of the coal briquette can be efficiently improved. Also, the coal particles may be crushed so that 90 wt% or more of the coal particles have a size of less than 3 mm. As described later, when using the sugar cane syrup as a binder, the pulverized coal may be a development coal, an unglazed coal, a lignite, or an anthracite. That is, as the sugar cane syrup and the pulverized coal of the above-described coal kind are mixed, the coal briquette with improved hot strength may be manufactured. Accordingly, the hot strength and the cold strength of the coal briquette may be prevented from being deteriorated by a change of a kind of the pulverized coal.
Next, the sugar cane syrup is provided in step S20. The sugar cane syrup includes one kind or more among sucrose, carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-), and water is included as an essential constituent element.
FIG. 2 is a view showing chemical formulas of components of the sugar cane syrup used in a manufacturing method of a coal briquette of FIG. 1. That is, FIG. 2 represents chemical formulas of sucrose, glucose, and fructose. A product name of sucrose is sugar. Sucrose is a disaccharide in which α-glucose and β-fructose are 1,2-linked, has a molecular formula of C12H22O11, and is a main component of a juice liquid such as from sugar cane, beets, etc. Sucrose is excellent in sweetness quality, strength, etc. such that it is used as a reference substance for sweetener evaluation. In an exemplary embodiment

of the present invention, sucrose may be included at 50 to 90 weight percent with respect to 100 weight percent of the sugar cane syrup. In detail, sucrose may be included at 65 to 85 weight percent. More preferably, sucrose may be included at 70 to 78 weight percent. When an amount of sucrose within the sugar cane syrup is very small, the strength of the coal briquette may not be sufficiently obtained and microorganism breeding may not be suppressed. Particularly, microorganisms included in the sugar cane syrup at a large amount ferment the sucrose included in the sugar cane syrup into an alcohol component so to reduce a sugar component, thereby deteriorating the cold strength of the coal briquette. According, it is necessary to not allow the sugar cane syrup to be fermented by the microorganisms. Also, when the amount of sucrose is excessive, the mixture is not well coated within the coal briquette when manufacturing the coal briquette and the mixture may stick to a roll. Accordingly, the amount of sucrose is controlled with the above-described range.
In the sugar cane syrup, at least one kind of glucose and fructose may be further included as well as sucrose. Glucose is a typical aldohexose, that is, a monosaccharide with 6 carbons and an aldehyde group. Glucose as a central compound for carbohydrate metabolism may synthesize 38 ATPs per molecule, and its molecular formula is C6H12O6. There are two kinds of optical isomers, which are a D type and an L type, and only the D type exists naturally, and this D-glucose is called glucose. On the other hand, fructose as a type of 2-ketohexose, which is also called levulose, is distributed as a free type and in a form of a disaccharide, or as a homopolysaccharide such as levan (β-2,6-

fructan) or inulin (β-1,2-fructan) in fruits, vegetables, honey, etc. When one of glucose and fructose is included in the sugar cane syrup, the amount thereof may be 0.1 to 5 weight percent with respect to 100 weight percent of the sugar cane syrup.
The sugar cane syrup includes at least one kind among carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-). As shown in Reaction Formula 1 below, carbon dioxide (CO2) existing in the sugar cane syrup is reversibly transformed into carbonic acid (H2CO3) and hydrogen carbonate ion (HCO3-). Hereinafter, the term carbon dioxide is used as a concept of a wide range including carbonic acid and carbonate ion, in which carbon dioxide is reversibly transformed, as well as carbon dioxide (CO2).
CO2 + H2O ↔ H2CO3 ↔ H+ + HCO3- (1)
Carbon dioxide dissolved in the sugar cane syrup reacts with the curing agent in a later-described step (S30) such that CaCO3 is produced like Reaction Formula 2 below, thereby serving a function of further improving the cold strength of the coal briquette.
H2O + 2CO2 + Ca(OH)2 ↔ CaCO3 + H2CO3 + H2O ↔ Ca2+ + 2HCO3-+H2O (2)
Carbon dioxide is included at 1 to 40 weight percent with respect to 100 weight percent of the sugar cane syrup. In detail, carbon dioxide may be included at 5 to 30 weight percent. More preferably, carbon dioxide may be included at 10 to 20 weight percent. When too little carbon dioxide is included, the cold strength of the coal briquette may not be sufficiently improved. When too much carbon dioxide is included, an excessive amount of CaCO3 is

produced, such that the cold strength of the coal briquette may decrease. Accordingly, the content of the carbon dioxide may be adjusted to the above range.
Sugar cane syrup may further include at least one among cellulose, lignin, and CaCO3. Cellulose and lignin are materials that are treated as impurities in the manufacturing process of the sugar cane syrup, however when the sugar cane syrup is used as the binder of the coal briquette, cellulose and lignin act as the binder in the manufacturing process of the coal briquette such that the cold strength of the coal briquette may be further improved. A Ca component is combined with carbon dioxide in the sugar cane syrup such that CaCO3 may be produced. When at least one kind of cellulose, lignin, and CaCO3 is included, they may be included at 0.1 to 5 weight percent with respect to 100 weight percent of the sugar cane syrup. More specifically, 0.1 to 5 weight percent of each of cellulose, lignin, and CaCO3 may be included.
The sugar cane syrup may further include at least one among paraffin, glycerin, and hexane. Paraffin may prevent bubble occurrence caused by an organic acid in the sugar cane syrup. That is, when carbon dioxide included in the sugar cane syrup is ejected to the outside, the bubble occurs. When agitating the sugar cane syrup, the organic material as a surfactant causes the bubble to form such that a container storing the sugar cane syrup may explode by a volume increase through the bubble occurrence. Paraffin, glycerin, and hexane are used to prevent this. When further including paraffin, glycerin, and hexane, 0.01 to 1 weight percent thereof may be included with respect to 100 weight percent of the sugar cane syrup.

The sugar cane syrup may include water as a balance. In detail, the water may be included at 8 to 40 weight percent with respect to 100 weight percent of the sugar cane syrup. When insufficient water is included, flowability is not good such that the efficiency of the manufacturing process of the coal briquette may be deteriorated. When excessive water is included, it is not suitable for use as the binder. Accordingly, the content of the water may be controlled within the above-described range. The content of the water affects the viscosity of the sugar cane syrup, and the viscosity of the sugar cane syrup may be 100 cP to 10,000 cP.
The sugar cane syrup is composed of the above-described components, but other components may be further included, and a case of further including other components is not excluded in the present invention.
Next, the manufacturing process of the sugar cane syrup will be described in detail.
FIG. 3 is a view schematically showing a manufacturing apparatus 15 to provide the sugar cane syrup. The manufacturing apparatus 15 of FIG. 3 is only to explain the present invention, and the present invention is not limited thereto. Accordingly, the manufacturing apparatus 15 may be modified into other forms.
As shown in FIG. 3, the manufacturing apparatus 15 includes a grinder 151, a juicer 152, a sugar cane juice reservoir 153, an impurity remover 155, a sugar cane concentrator 157, and a quicklime reservoir 159. The manufacturing apparatus 15 may further include other constituent elements if necessary.

The grinder 151 has protrusions and depressions on a surface thereof such that the sugar cane charged along with injected water is finely crushed. The finely crushed sugar cane is juiced with the juicer 152 and the sugar cane juice is extracted. The sugar cane juice is stored in the sugar cane juice reservoir 153. The sugar cane juice is manufactured by crushing the sugar cane such that many impurities mixed in the cultivation of the sugar cane exist. Accordingly, quicklime (CaO) or hydrated lime Ca(OH)2 is fed to the sugar cane juice transferred to the impurity remover 155 from the quicklime reservoir 159 to produce the sugar cane syrup from which the impurities are removed. In this case, CO2 is supplied along with CaO or Ca(OH)2. When the pH of the sugar cane juice is controlled within 8 to 10, the removal of the impurities may be easier. The sugar cane syrup may be directly used or concentrated to be used as the coal briquette binder. Since the sugar cane syrup has very low viscosity, it is advantageous for pipeline transport compared to molasses. Also, since the sugar cane syrup has excellent mixing efficiency, a cold strength deviation of the coal briquette may be reduced by a uniform mixture. Further, the sugar cane syrup stably maintains the cold strength of the coal briquette regardless of a variation of the coal type. In this case, as the amount of water injected to the sugar cane syrup and the amount of sugar cane are controlled, the amount of sucrose, etc. included in the sugar cane syrup may be controlled in an appropriate range. When long-term storage is necessary for transport of the sugar cane syrup, a bubble inhibitor such as paraffin, glycerin, and hexane may be added at 0.01 to 1 weight percent with respect to the sugar cane syrup. Paraffin may prevent the bubble occurrence of the sugar cane syrup cause by

the organic acid, etc. That is, when carbon dioxide included in the sugar cane syrup is ejected to the outside, the bubble occurs. When agitating the sugar cane syrup, the organic material as a surfactant causing the bubble exists such that a container storing the sugar cane syrup may explode because of a volume increase and the bubble occurrence. Paraffin, glycerin, and hexane are used to prevent this. The sugar cane syrup is further concentrated in the sugar cane concentrator 157, and is transferred to the coal briquette manufacturing process to be used. The sugar cane syrup is distilled and recrystallized by use of a vacuum fan (154) for extraction of a raw sugar solution and is extracted as massecuite, and the raw sugar is extracted through a centrifugal separation step in a centrifugal separator 156. This process is continuously repeated from the vacuum fan 154 and the centrifugal separator 156 to extract the raw sugar, and molasses is discharged as a byproduct. In an exemplary embodiment of the present invention, since the sugar cane syrup concentrated in the sugar cane concentrator 157 is used, the recrystallization and centrifugal separation processes are not required, the manufacturing process is simple, and sugar cane syrup of a low cost is produced.
In this way, since the sugar cane syrup is obtained by juicing sugar cane and concentrating the juice, the production process thereof is simple, and a crystallization process requiring a high investment cost is unnecessary. Further, a process for preparing a solution for use as the binder may be omitted. Therefore, the process can be made more efficient by simplifying the process as a whole. In addition, when a sugar cane syrup production area and a manufacturing area of the coal briquette are close, the transportation cost is low

such that the price of sugar cane is low, so the price of the binder is low, and the manufacturing cost can consequently be reduced. Further, since the sugar cane syrup does not stick well to a molding roll, a shape failure occurrence of the coal briquette may be prevented, and since the viscosity is lower than that of molasses, the sugar cane syrup may be more uniformly coated to the coal briquette. On the other hand, since the sugar cane syrup has higher adhesion ability compared with molasses, the cold strength of the coal briquette is improved, thereby preventing deterioration of the cold strength and the hot strength due to vibration change of a coal kind of the coal briquette. If the sugar cane syrup is used instead of the molasses binder, coals of various kinds may be used.
When the molasses binder is concentrated, since the solid content increases to more than 80 % and the viscosity becomes 25,000 cP or more, the molasses binder may not be applied to the coal briquette process. The viscosity of the sugar cane syrup is 100 cP to 10,000 cP. That is, the viscosity of the sugar cane syrup is lower than the molasses by 40 times or more. Therefore, transportation, storage, and quantification extraction for the coal briquette manufacture is easy. Also, when being mixed with the pulverized coal, the mixing efficiency increases such a coal briquette strength deviation may be improved.
Again referring to FIG. 1, in step S30, the sugar cane syrup and the curing agent are added to the pulverized coal to provide the mixture.
The sugar cane syrup was described in detail, and the sugar cane syrup at more than 0 to less than 12 weight percent with respect to 100 weight

percent of the pulverized coal is added. When the amount of the sugar cane syrup is large, the manufacturing cost of the coal briquette may increase. Also, when the amount of the sugar cane syrup is small, the cold strength of the coal briquette may be deteriorated. Accordingly, the amount of the sugar cane syrup may be controlled in the above range. In detail, the sugar cane syrup at
5 to 10 weight percent with respect to 100 weight percent of pulverized coal
may be added. In detail, the addition amount of the sugar cane syrup may be
determined depending on the content of sucrose within the syrup. For
example, when sucrose at 70 to 78 weight percent is included therein, sugar
cane syrup at 5 to 10 weight percent with respect to 100 weight percent of the
pulverized coal may be added. Further, when sucrose at 65 to 75 weight
percent is included therein, the sugar cane syrup at 6 to 11 weight percent with
respect to 100 weight percent of the pulverized coal may be added.
The curing agent may include at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), calcium carbonate, cement, bentonite, clay, silica, silicate, dolomite, magnesium oxide (MgO), magnesium hydroxide (Mg(OH)2), phosphoric acid, and sulfuric acid, and in detail, may include at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), magnesium oxide (MgO), and magnesium hydroxide (Mg(OH)2). The curing agent at 1 weight percent to
6 weight percent may be added with respect to 100 weight percent of the
pulverized coal. By controlling the amount of the curing agent within the
above-described amount, the cold strength of the coal briquette may be largely
improved by the combining with the sugar cane syrup. In detail, the curing
agent at 2 weight percent to 4 weight percent may be added with respect to 100

weight percent of the pulverized coal.
The sugar cane syrup and the curing agent may be simultaneously added, however it is preferable for the curing agent to be firstly added and then to add the sugar cane syrup for smooth combination. In detail, the curing agent is added to the pulverized coal to provide a first mixture, and the first mixture and the sugar cane syrup are mixed to form the mixture.
The mixture may be mixed for 5 minutes to 30 minutes. When the mixture time is short, the sugar cane syrup is not uniformly distributed in the pulverized coal. Further, when the mixture time is too long, the fluidity of the mixture is deteriorated and the manufacturing cost increases. Accordingly, it is preferable for the mixture time to be controlled with the above-described range. In addition, for the same reason as described above, it is preferable for the mixture temperature to be 50 °C to 100 °C.
In step S40, the mixture is molded to provide the coal briquette. For example, although not shown in FIG. 1, the coal briquette in a form of a pocket or a strip may be manufactured by charging the mixture between a pair of rolls that are rotated in opposite directions to each other. In this case, the coal briquette may be manufactured at 3 °C to 300 °C. By manufacturing the coal briquette within the above-described temperature range, the coal briquette having the excellent hot strength and cold strength may be obtained. Also, since the amount of sugar cane syrup contained in the coal briquette is increased, the cold strength of the coal briquette may be improved.
The binder component included in the coal briquette may be analyzed as follows. First, a 100 g coal briquette is finely crushed. Then, 500 mL of

ethanol is added and the liquid is separated from the coal. Next, the liquid is filtrated to separate a solid, the liquid is removed by using a rotary evaporator, and the balance is dissolved in water to determine a ratio of 0.01 % sucrose. In general, since the sucrose ratio of molasses is 30 wt% to 40 wt%, it may be assumed that the sugar cane syrup can be used as the coal briquette binder when the amount of sucrose thereof is more than that.
FIG. 4 is a schematic view of a molten iron manufacturing device using a coal briquette manufactured in FIG. 1. A structure of the molten iron manufacturing device 100 of FIG. 4 is only to illustrate the present invention, and the present invention is not limited thereto. Accordingly, the molten iron manufacturing device 100 of FIG. 4 can be transformed into various shapes.
As shown in FIG. 4, the molten iron manufacturing device 100 includes a melter gasifier 10, a fluidized bed reduction furnace 22, a reduced iron compression device 40, and a compressed reduced iron reservoir 50. The compressed reduced iron reservoir 50 may not be provided.
The prepared coal briquettes are charged into the melter gasifier 10, and form a coal-filled bed inside the melter gasifier 10. The coal briquettes generate a reducing gas in the melter gasifier 10, and the generated reducing gas is supplied to the fluidized bed reduction furnace 22. Fine iron ore is supplied to a plurality of fluidized bed reduction furnaces 22 each having a fluidized bed, is fluidized by the reducing gas supplied into the fluidized bed reduction furnaces 22 from the melter gasifier, and then becomes reduced iron. The reduced iron is compressed by the reducing iron compression device 40, and then stored in the compressed reduced iron reservoir 50. The

compressed reduced iron is supplied from the compressed reduced iron reservoir 50 to the melter gasifier 10, and then melted in the melter gasifier 10.
A dome portion 101 is formed at the upper portion of the melter gasifier 10. That is, a wide space is formed as compared with other parts of the melter gasifier 10, and high-temperature reducing gas is directed to the wide space. Therefore, the coal briquettes charged into the dome portion 101 are easily differentiated by the high-temperature reducing gas. In other words, the coal briquettes are charged to the top of the melter gasifier that is maintained at 1000 °C, and thus the coal briquettes are quickly shocked by heat. Therefore, while the coal briquettes are moved to the lower part of the melter gasifier, the coal briquettes may be differentiated.
However, since the coal briquettes prepared according to the method of FIG. 1 have high hot strength, the coal briquettes are not differentiated at the dome portion 101 of the melter gasifier 10, and fall to the lower portion of the melter gasifier 10. Char produced by a pyrolytic reaction of the coal briquettes is moved to the lower part of the melter gasifier 10, and then subjected to an exothermic reaction with oxygen supplied from a tuyere 30. As a result, the coal briquettes may be used as a heat source for maintaining the melter gasifier 10 at a high temperature. Meanwhile, since the char has gas permeability, a large amount of gas generated at the lower part of the melter gasifier 10 and reduced iron supplied from the fluidized bed reduction furnace 22 can be easily and uniformly passed through the coal-filled bed in the melter gasifier 10.
In addition to the above-described coal briquettes, if necessary, lump coal or coke may be charged into the melter gasifier 10. The tuyere 30 is

provided on the external wall of the melter gasifier 10 to feed oxygen therein. The oxygen is fed into the coal-filled bed and forms a combustion zone. The coal briquettes may be combusted in the combustion zone to generate reducing gas.
The cold strength of the coal briquette may not only be maximized, but the coal briquette cost may also be lower by using the sucrose of the sugar cane syrup. Also, the process efficiency of the fluidized bed reduction furnace may be maximized and logistics costs by long-distance transport of molasses can be reduced.
FIG. 5 is a schematic view of another molten iron manufacturing device using a coal briquette manufactured in FIG. 1. The structure of the molten iron manufacturing device 200 of FIG. 5 is only to illustrate the present invention, and the present invention is not limited thereto. Accordingly, the molten iron manufacturing device 200 of FIG. 5 can be transformed into various shapes. The structure of the molten iron manufacturing device 200 of FIG. 5 is similar to the structure of the molten iron manufacturing device 100 of FIG. 4, and thus the same parts are indicated by using the same reference numerals and the detailed descriptions thereof are not provided.
As shown in FIG. 5, the molten iron manufacturing device 200 includes a melter gasifier 10 and a packed bed reduction furnace 20. In addition, the molten iron-manufacturing apparatus 200 may include other devices if necessary. Iron ore is charged to the packed bed reduction furnace 20 and is reduced. The iron ore charged into the packed bed reduction furnace 20 is dried in advance, and then, while being passed through the packed bed

reduction furnace 20, the iron ore becomes reduced iron. The reduced gas is supplied from the melter gasifier 10 to the packed bed reduction furnace 20, and thus the filled bed is formed inside the packed bed reduction furnace 20.
Hereinafter the present invention will further described in detail through experimental examples. These experimental examples are only to illustrate the present invention, and the present invention is not limited thereto.
Experimental Examples 1-4: a coal briquette strength experiment depending on a content of carbon dioxide in a sugar cane syrup
Coal, sugar cane syrup, and a curing agent are prepared. The sugar cane syrup including sucrose at 70 weight percent with respect to 100 weight percent of sugar cane, carbon dioxide of the content represented in Table 1, and a balance of water is prepared.
The coal briquette including the coal at 100 weight percent, the sugar cane syrup at 10 weight percent, the curing agent at 2.7 weight percent, and the moisture is manufactured. Firstly, the coal and the curing agent are mixed for 1 minute to 20 minutes, and then the sugar cane syrup is added to be mixed for 1 to 20 minutes.
The mixture is charged and compressed to manufacture 100 weight percent of the coal briquette with a pillow shape of a 64.5 mm X 25.4 mm X 19.1 mm size.
Compression strength and drop strength are measured after drying for 1 hour and are summarized in Table 1 below.
(Table 1)

As shown in Table 1, it may be confirmed that the compression strength and the drop strength are improved in Experimental Example 1 to Experimental Example 4, in which carbon dioxide of a proper amount is included in the sugar cane syrup, compared with Comparative Example 1 and Comparative Example 2.
Experimental Example 5-7: a coal briquette strength experiment depending on a content of sucrose in a sugar cane syrup
Coal, sugar cane syrup, and a curing agent are prepared. The sugar cane syrup including sucrose at a content represented in Table 2 with respect to 100 weight percent of sugar cane, carbon dioxide at 10 weight percent, and the balance of water is prepared.
The coal briquette including the coal at 100 weight percent, the sugar cane syrup at 10 weight percent, the curing agent at 2.7 weight percent, and the moisture is manufactured. Firstly, the coal and the curing agent are mixed for

1 minute to 20 minutes, and then the sugar cane syrup is added to be mixed for 1 to 20 minutes.
The mixture is charged and compressed to manufacture 100 weight percent of the coal briquette with a pillow shape of a 64.5 mm X 25.4 mm X 19.1 mm size.
The compression strength and the drop strength are measured after drying for 1 hour and are summarized in Table 2 below.
As shown in Table 2, it may be confirmed that the compression strength and the drop strength are improved in Experimental Example 5 to Experimental Example 7, in which the content (a concentration and a combination ratio) of sucrose is included in the proper range in the sugar cane syrup, compared with Comparative Example 3.

Experimental Example 7-9: a coal briquette strength experiment depending on an amount in a sugar cane syrup
Coal, sugar cane syrup, and a curing agent are prepared. The sugar cane syrup including sucrose at 75 weight percent with respect to 100 weight percent of sugar cane, carbon dioxide at 10 weight percent, and the balance of water is prepared.
The coal briquette including the coal at 100 weight percent, the sugar cane syrup at the content summarized in Table 3 below, the curing agent at 2.7 weight percent, and the moisture is manufactured. In a Comparative Example 4, molasses at 10 weight percent instead of the sugar cane syrup is used. Firstly, the coal and the curing agent are mixed for 1 minute to 20 minutes, and then the sugar cane syrup is added to be mixed for 1 to 20 minutes.
The mixture is charged and compressed to manufacture 100 weight percent of the coal briquette with a pillow shape of a 64.5 mm X 25.4 mm X 19.1 mm size.
The compression strength and the drop strength are measured after drying for 1 hour, and are summarized in Table 3 below.

As shown in Table 3, it may be confirmed that the compression strength and the drop strength are improved in Experimental Example 7 to Experimental Example 9 using the sugar cane syrup as the binder compared with Comparative Example 4 using molasses as the binder.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10. melter gasifier
15. sugar cane syrup manufacturing apparatus
20. packed bed reduction furnace
22. fluidized bed reduction furnace
30. tuyere

40. reduced iron compression device 50. compressed reduced iron reservoir
100, 200. molten iron manufacturing device
101. dome portion
151. grinder
152. juicer
153. sugar cane juice reservoir
154. vacuum fan
155. impurity remover
156. centrifugal separator
157. sugar cane concentrator 159. quicklime reservoir

We Claim:
1. A manufacturing method of a coal briquette charged to a dome
portion of a melter gasifier to be rapidly heated in a molten iron manufacturing
device including the melter gasifier charged with reduced iron, and a reduction
furnace connected to the melter gasifier and providing the reduced iron,
comprising:
a step of providing pulverized coal; a step of providing sugar cane syrup;
a step of adding the sugar cane syrup and a curing agent to the pulverized coal to provide a mixture; and
a step of molding the mixture to provide a coal briquette.
2. The manufacturing method of claim 1, wherein
the sugar cane syrup includes sucrose at 50 to 90 weight percent with respect to 100 weight percent of the sugar cane syrup, at least one among carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-) at 1 to 40 weight percent, and a balance of water.
3. The manufacturing method of claim 1, wherein
the sugar cane syrup includes sucrose at 65 to 85 weight percent, at least one kind among carbon dioxide (CO2), carbonic acid (H2CO3), and

hydrogen carbonate ion (HCO3-) at 5 to 30 weight percent, and the balance of water.
4. The manufacturing method of claim 3, wherein
the sugar cane syrup includes sucrose at 70 to 78 weight percent, at least one kind among carbon dioxide (CO2), carbonic acid (H2CO3), and hydrogen carbonate ion (HCO3-) at 10 to 20 weight percent, and the balance of water.
5. The manufacturing method of claim 1, wherein
the sugar cane syrup further includes at least one kind among glucose and fructose at 0.1 to 5 weight percent.
6. The manufacturing method of claim 1, wherein
the sugar cane syrup further includes at least one kind among cellulose, lignin, and CaCO3 at 0.1 to 5 weight percent.
7. The manufacturing method of claim 1, wherein
the sugar cane syrup further includes at least one kind among paraffin,

glycerin, and hexane at 0.01 to 1 weight percent.
8. The manufacturing method of claim 1, wherein
the sugar cane syrup includes water at 8 to 40 weight percent.
9. The manufacturing method of claim 1, wherein
the viscosity of the sugar cane syrup is 100 cP to 10000 cP.
10. The manufacturing method of claim 1, wherein
the step of providing the sugar cane syrup includes:
a step of crushing sugar cane while injecting water;
a step of juicing the crushed sugar cane to provide a sugar cane juice;
a step of adding CO2, and CaO or Ca(OH)2, into the sugar cane juice; and
a step of concentrating the sugar cane juice to manufacture the sugar cane syrup.
11. The manufacturing method
of claim 10, wherein

the step of providing the sugar cane syrup further includes a step of adding a bubble inhibitor to the sugar cane syrup after forming the sugar cane syrup.
12. The manufacturing method of claim 11, wherein
the bubble inhibitor is at least one kind among paraffin, glycerin, and hexane.
13. The manufacturing method of claim 10, wherein
in the step of adding CO2, and CaO or Ca(OH)2, into the sugar cane juice, pH of the sugar cane juice is 8 to 10.
14. The manufacturing method of claim 1, wherein
in the step of providing the mixture, the sugar cane syrup at more than 0 to less than 12 weight percent and the curing agent at 1 weight percent to 6 weight percent with respect to 100 weight percent of the pulverized coal are added.
15. The manufacturing method of claim 14, wherein

in the step of providing the mixture, the sugar cane syrup at 5 to 10 weight percent and the curing agent at 2 weight percent to 4 weight percent with respect to 100 weight percent of the pulverized coal are added.
16. The manufacturing method of claim 1, wherein
the curing agent is at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), calcium carbonate, cement, bentonite, clay, silica, silicate, dolomite, magnesium oxide (MgO), magnesium hydroxide (Mg(OH)2), phosphoric acid, and sulfuric acid.
17. The manufacturing method of claim 16, wherein
the curing agent is at least one kind among quicklime (CaO), hydrated lime (Ca(OH)2), magnesium oxide (MgO), and magnesium hydroxide (Mg(OH)2).
18. The manufacturing method of claim 1, wherein
the step of adding the sugar cane syrup and the curing agent to the pulverized coal to provide the mixture includes:
a step of adding the curing agent to the pulverized coal to provide a first mixture; and
a step of mixing the first mixture and the sugar cane syrup to provide the

19. The manufacturing method of claim 1, wherein
the step of adding the sugar cane syrup and the curing agent to the pulverized coal to provide the mixture is carried out by adding the sugar cane syrup and the curing agent to the pulverized coal and mixing them for 5 to 30 minutes.