【CLAIMS】【Claim 1】
A method of manufacturing coal briquettes which are inputted into and quickly heated in a dome portion of a melting and gasifying furnace in an apparatus for manufacturing molten iron that comprises the melting and gasifying furnace into which reduced iron is inputted, and a reducing furnace which is connected to the melting and gasifying furnace and provides the reduced iron, the method comprising:
providing powdered coal;
preparing a coal blend by mixing powdered coal and acid-treated starch powder;
heat treating the coal blend; and
manufacturing coal briquettes by molding the heat-treated coal blend.
【Claim 2】
The method of claim 1, wherein
in the step of preparing the coal blend, the acid-treated starch powder is prepared by the steps comprising: pulverizing biomass; separating the remaining liquid comprising starch by

immersing the pulverized biomass in an acid aqueous solution; washing the separated remaining liquid with a pH of 3 to 5.5; and drying the washed remaining liquid.
【Claim 3】
The method of claim 1, wherein
in the step of preparing the coal blend, the pH of the acid-treated starch powder is 3 to 5.5 when dissolved in water at a concentration of 30 % by volume.
【Claim 4】
The method of claim 1, wherein
in the step of preparing the coal blend, an average particle size of the acid-treated starch powder is 0.01 to 1 mm.
【Claim 5】
The method of claim 1, wherein
in the step of preparing the coal blend, the acid-treated starch powder of 1 to 10 parts by weight are added to the powdered coal of 100 parts by weight.

【Claim 6】
The method of claim 1, wherein
the step of preparing the coal blend is performed at a temperature of 50 to 65 ℃.
【Claim 7】
The method of claim 1, wherein
in the step of heat treating, the acid-treated starch powder in the coal blend is transformed into a bio-plastic by the heat treatment.
【Claim 8】
The method of claim 1, wherein
the step of heat treating comprises supplying steam to the coal blend.
【Claim 9】
The method of claim 8, wherein
the moisture in the steam is supplied such that becomes 1 to 5 parts by weight to the powdered coal of 100 parts by weight.

【Claim 10】
The method of claim 8, wherein a temperature of the steam is 120 to 300 ℃.
【Claim 11】
The method of claim 1, wherein
in the step of heat treating, a temperature of the coal blend is 60 to 200 ℃.
【Claim 12】
The method of claim 1, further comprising drying the heat-treated coal blend after the step of heat treating.
【Claim 13】
The method of claim 1, wherein
the manufactured coal briquette comprises 1 to 10 wt% of a bio-plastic, 3 to 15 wt% of moisture, and a balance of coal, and the bio-plastic consists of 25 to 70 wt% of amylopectin and 30 to 75 wt% of amylose.

【Claim 14】
An apparatus for manufacturing coal briquettes which are inputted into and quickly heated in a dome portion of a melting and gasifying furnace in an apparatus for manufacturing molten iron that comprises the melting and gasifying furnace into which reduced iron is inputted, and a reducing furnace which is connected to the melting and gasifying furnace and provides the reduced iron, the apparatus comprising:
a powdered coal supply bin;
an acid-treated starch powder supply bin;
a mixer supplied with powdered coal and acid-treated starch powder from the powdered coal supply bin and the acid-treated starch powder supply bin and mixing to prepare a coal blend;
a kneader provided with the coal blend from the mixer and heat treating it; and
a molder provided with the heat-treated coal blend from the kneader and molding it.
【Claim 15】
The apparatus of claim 14, further comprising a preheating mixer preheating the coal blend at a

temperature of 50 to 65 ℃ and mixing between the mixer and the kneader.
【Claim 16】
The apparatus of claim 14, wherein
the kneader is connected with a steam supply pipe and is provided with steam from the steam supply pipe to heat treat the coal blend.
【Claim 17】
The apparatus of claim 14, wherein
a dryer drying the heat-treated coal blend between the kneader and the molder.