Specification
Title: Quick setting agent for wet type spraying material, manufacturing method thereof, wet type spraying material including the same and method of constructing a wet type spraying material
Technical field
[0001]
　TECHNICAL FIELD The present invention relates to a quick setting agent for a wet type spraying material, a manufacturing method thereof, a wet type spraying material including the same, and a method of constructing a wet type spraying material.
BACKGROUND ART
[0002]
　As the lining of various industrial kiln furnaces with irregular refractories or repair thereof, the monolithic refractories are preliminarily kneaded with a predetermined amount of moisture, then pressure-fed to the nozzle, quick-add additives are added in front of the nozzle or nozzle, and sprayed Wet spraying method is known. As a role of the quick-setting admixture used in this method, a quick setting action and a curing accelerating action can be mentioned. The quick connect action is a function to momentarily eliminate the fluidity of the muddy so as to prevent the muddy with flowable pumpable pumping from falling from the surface to be coated at the moment of spraying . This disappearance of flowability is manifested by rapid coalescence agglomeration of particles in muddy weather.
[0003]
　Conventionally, alkaline salt aluminate solution, alkali silicate solution, calcium chloride solution, calcium hydroxide slurry and the like are used as quick-setting admixtures. However, alkali aluminates and alkali silicates contain caustic soda, which is not preferable from the working environment.
[0004]
　In view of this, in Patent Document 1, a rapid setting agent in which calcium chloride is mixed into a specific calcium hydroxide slurry has been proposed.
Prior Art Document
Patent literature
[0005]
Patent Document 1: Japanese Unexamined Patent Publication No. 2014-101242
Summary of the invention
Problem to be Solved by Invention
[0006]
　However, the calcium hydroxide slurry used in Patent Document 1 has a high viscosity, transportability by a pump is not good, and there is a problem that clogging due to adhesion occurs in the quick-filler supply pipe It was. In addition, as a quick-setting admixture, it is described that it is mixed with a large amount of calcium chloride and used.
[0007]
　The inventors of the present invention have found that by using a calcium hydroxide slurry having a low viscosity, transportability by a pump is improved, excellent workability is obtained, and a large amount of calcium chloride It was found that good curability can be obtained without using it.
[0008]
　An object of the present invention is to provide a quick-setting admixture excellent in workability and capable of obtaining satisfactory quick-setting property and curability, a method for producing the same, and a method for constructing a wet type spraying material and a wet type spraying material including the same .
Means for solving the problem
[0009]
　The quick-setting admixture of the present invention is a quick-setting admixture for a wet type spraying material of an irregular refractory prepared from a calcium hydroxide slurry to which calcium chloride is added as necessary, and the calcium hydroxide slurry The oxalic acid reactivity, sedimentation volume, and viscosity defined are respectively oxalic acid reactivity: 40 minutes or less, sedimentation volume: less than 60 ml, and viscosity: less than 200 mPa · S, calcium hydroxide and The total content of calcium chloride is less than 46 mass%, and the content ratio of calcium hydroxide: calcium chloride is in the range of 50: 50 to 100: 0.
[0010]
　Oxalic Acid Reactivity: 50 g of calcium hydroxide slurry prepared at a concentration of 5% by mass and kept at 25 ± 1 ° C. was added with 40 g of oxalic acid aqueous solution having a concentration of 0.5 mol / liter kept at 25 ± 1 ° C. Was added at a stroke, and the time (minute) until the pH reached 7.0 after addition was measured,
[0011]
　Settling volume: Calcium hydroxide slurry adjusted to a concentration of 2 mass% was placed in a 100 ml graduated cylinder, allowed to stand at room temperature and sedimentation volume measured after 1 hour elapsed
[0012]
　Viscosity: Viscosity when calcium hydroxide slurry adjusted to a concentration of 8% by mass was measured with a B type viscometer
[0013]
　The oxalic acid reactivity is preferably 20 minutes or less.
[0014]
　The BET specific surface area of ​​calcium hydroxide is preferably 5 m 2 / g or more.
[0015]
　The method for producing a quick-setting admixture of the present invention comprises a step of subjecting a calcium hydroxide slurry to a milling treatment, a step of drying the calcium hydroxide slurry after the milling treatment to powder calcium hydroxide, A step of preparing a calcium hydroxide slurry by adding water to powdered calcium hydroxide and adding calcium chloride if necessary to the resultant calcium hydroxide slurry to prepare the quick setting formulation of the present invention In order to improve the quality of the image.
[0016]
　The wet blowing material of the present invention is characterized by including a refractory powder, alumina cement and the rapid setting agent of the present invention.
[0017]
　In the method of applying a wet type spraying material of the present invention, water is added to an irregular shaped refractory including refractory powder and alumina cement and kneaded to prepare a muddy weather, and the quick-setting admixture of the present invention is added to the muddle And spraying the added wet blowing material is carried out.
Effect of the invention
[0018]
　According to the present invention, workability is excellent and good quick-setting property and curability are obtained.
MODE FOR CARRYING OUT THE INVENTION
[0019]
　Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments.
[0020]
　The quick-setting admixture of the present invention is prepared from a calcium hydroxide slurry to which calcium chloride is added, if necessary, wherein the oxalic acid reactivity of the calcium hydroxide slurry is 40 minutes or less, the sedimentation volume is less than 60 ml, the viscosity is 200 mPa · S, which is smaller than S.
[0021]
　The oxalic acid reactivity, the sedimentation volume, and the viscosity of the calcium hydroxide slurry in the present invention are the oxalic acid reactivity, the sedimentation volume, and the sedimentation capacity of the calcium hydroxide slurry before addition of calcium chloride when calcium chloride is added It is viscosity.
[0022]
　(Calcium hydroxide slurry) The
　calcium hydroxide slurry can be prepared, for example, by reacting quicklime (calcium oxide) obtained by calcining limestone with water. For example, it is possible to prepare a calcium hydroxide slurry by calcining limestone in a kiln at about 1000 ° C. to produce quicklime, adding about ten times the amount of hot water to the quicklime, and stirring for 30 minutes it can.
[0023]
　As described above, the calcium hydroxide slurry of the present invention has an oxalic acid reactivity of 40 minutes or less, a sedimentation volume of less than 60 ml and a viscosity of less than 200 mPa · S. Such a calcium hydroxide slurry can be produced by grinding the calcium hydroxide slurry prepared as described above. Examples of the grinding treatment include a bead mill and the like. Particularly, by carrying out the grinding treatment, it is possible to reduce the value of the oxalic acid reactivity.
[0024]
　
　The oxalic acid reactivity in the present invention was adjusted to a concentration of 5 mass% and added to 50 g of the calcium hydroxide slurry kept at 25 ± 1 ° C. at 0.5 ± 1 ° C. 40 g of oxalic acid aqueous solution having a concentration of mol / liter is added all at once and measuring the time (minute) until the pH reaches 7.0 after the addition can be obtained. More preferably, the oxalic acid reactivity is 30 minutes or less, more preferably 20 minutes or less. When the value of the oxalic acid reactivity increases, it becomes difficult to obtain excellent quick-setting property and curability.
[0025]
　
　The sedimentation volume in the present invention is the sedimentation volume measured after 1 hour from the placement of a calcium hydroxide slurry adjusted to a concentration of 2% by mass in a 100 ml graduated cylinder after standing at room temperature.
[0026]
　In the present invention, the sedimentation volume is less than 60 ml, more preferably 50 ml or less, particularly preferably 40 ml or less. As the sedimentation volume increases, the pumping performance by the pump deteriorates and the workability sometimes deteriorates.
[0027]
　
　The viscosity when the calcium hydroxide slurry in the present invention is adjusted to 8 mass% and measured with a B type viscometer is less than 200 mPa · S, more preferably 100 mPa · s or less, particularly preferably It is 80 mPa · s or less. If the viscosity is increased, the pumping performance by the pump deteriorates and the workability sometimes deteriorates.
[0028]
　
　The BET specific surface area of ​​the calcium hydroxide slurry of the present invention is preferably 5 m 2 / g or more, more preferably 8 m 2 / g or more, particularly preferably 6 to 10 m 2 / g It is within the range. The BET specific surface area can be obtained by drying the calcium hydroxide slurry and measuring the BET specific surface area of ​​powdered calcium hydroxide. If the BET specific surface area is too low, excellent quick-setting properties and curability may not be obtained in some cases.
[0029]
　(Preparation of Calcium Hydroxide Slurry)
　As described above, calcium hydroxide slurry in the present invention can be prepared by subjecting calcium hydroxide slurry to a milling treatment. Alternatively, the calcium hydroxide slurry after grinding treatment may be dried and pulverized, and water may be added to the powdered calcium hydroxide slurry to form calcium hydroxide slurry again. By using powdered calcium hydroxide, costs such as transportation expenses can be reduced and handling and the like can be facilitated.
[0030]
　(Quick-bonding
　agent ) The quick-setting admixture of the present invention is prepared by adding calcium chloride to the calcium hydroxide slurry as necessary. The total content of calcium hydroxide and calcium chloride in the quick-filling agent is less than 46 mass%, more preferably 40 mass% or less, particularly preferably 35 mass% or less. If the sum of the content of calcium hydroxide and calcium chloride in the quick-filling agent is too high, the viscosity becomes high, so that clogging due to adhesion in the quick-connect material supply pipe occurs, and the transportability by the pump is deteriorated. In addition, the rapid acting action is strong, the monolithic refractory solidifies before it reaches the surface to be coated, and the rebound loss increases. Further, since solidification occurs in the nozzle, nozzle clogging occurs and it is likely to be impossible to blow.
[0031]
　In addition, the total content of calcium hydroxide and calcium chloride in the quick-filling agent is preferably 10% by mass or more. If the sum of the contents of calcium hydroxide and calcium chloride in the quick-filling agent is too low, the quick-setting action is insufficient, which is not preferable.
[0032]
　In the present invention, the content ratio of calcium hydroxide: calcium chloride in the quick-filling agent is in the range of 50: 50 to 100: 0. Calcium hydroxide has a function of preventing the workpiece attached to the surface to be coated from dropping due to its own weight by accelerating curing of the worked body. Calcium chloride has a function of preventing the work body from dropping from the surface to be coated at the time of spraying by aggregating the worked body.
[0033]
　When the content of calcium chloride is too large, retardation of curing of the worked body occurs and the above function of calcium hydroxide is not sufficiently exhibited. The content ratio of calcium hydroxide: calcium chloride in the quick-filling agent is more preferably in the range of 60:40 to 100: 0, and still more preferably in the range of 70:30 to 100: 0.
[0034]
　(Wet Blowing Material)
　The wet blowing material of the present invention contains refractory powder, alumina cement and the above-described quick setting agent of the present invention.
[0035]
　Besides these, the wet type spraying material may contain a binder, a dispersant, an organic fiber, a metal component, a thickener, and the like.
[0036]
　Examples of the refractory powder include alumina raw materials such as fused alumina, sintered alumina, bauxite, diaspore, shale shale, and calcined alumina, silica stone, silica sand, amorphous silica (for example, micro silica, silica flower , Fumed silica, white carbon), alumina siliceous raw materials such as waxy stone, chamotte, clay, undarussite, sillimanite, kaya knight and mullite, coal, coke, pitch, artificial graphite, natural graphite , Scaly graphite, earthy graphite), carbonaceous raw materials such as carbon black, spinel raw materials such as electro fused spinel and sintered spinel, magnesia raw material such as magnesia clinker, dolomite raw material such as dolomite clinker, electrofused zirconia and the like Zirconia raw material such as zircon sand, nitriding From raw material raw material, aluminum nitride raw material, silicon carbide raw material, boron carbide raw material, titanium boride raw material, zirconium boride raw material, etc., and pulverized refractory waste material containing at least either of them as a main component One or more kinds selected can be used.
[0037]
　In consideration of flowability / adhesiveness at the time of construction, compactness of the construction body, etc., preparation of the particle size of the refractory powder is appropriately prepared for coarse grains, medium grains and fine grains. In addition, it is preferable to combine ultrafine powder having an average particle size of 10 μm or less such as calcined alumina, light calcined magnesia, volatile silica, calcined spinel and the like for the fine particles.
[0038]
　The alumina cement functions as a binder, and the addition amount thereof is preferably from 0.5 to 20 parts by mass, more preferably from 2 to 10 parts by mass, based on 100 parts by mass of the refractory powder. When it is 0.5 parts by mass or more, good corrosion resistance can be maintained. In addition, alumina cement is preferably one having an average particle size of 10 μm or less for the reason that it is possible to increase pump pumpability of muddy objects and the like.
[0039]
　Examples of binders other than alumina cement include aluminum lactate, calcium lactate, aluminum glycolate, lactic acid-aluminum glycolate, hydraulic alumina, magnesia cement, portland cement, phosphate, silicate and the like. When these are used in combination, the addition amount thereof is, for example, 20 parts by mass or less based on 100 parts by mass of the refractory powder.
[0040]
　Dispersants have the effect of increasing the fluidity of muddy objects. Specific examples thereof are sodium tripolyphosphate, sodium hexametaphosphate, sodium polyacrylate, sodium polyacrylic phosphate, polycarboxylic acid, sodium ligninsulfonate, carboxyl group-containing polyether and the like. If the addition amount is too small, the effect of improving the fluidity can not be obtained, whereas if it is too much, the fluidity is rather impaired, so it is preferably 0.01 to 0.5 parts by mass based on 100 parts by mass of the refractory powder .
[0041]
　Examples of the organic fiber include polypropylene fiber, nylon fiber, PVA fiber, polyethylene fiber, acrylic fiber, polyester fiber, pulp and the like. The addition amount thereof is preferably 0.02 to 1 part by mass with respect to 100 parts by mass of the refractory powder.
[0042]
　As the thickener, for example, bentonite, CMC, isobane and the like can be mentioned, and the addition amount thereof is preferably 5 parts by mass or less with respect to 100 parts by mass of the refractory powder.
[0043]
　Examples of the metal powder include aluminum, silicon, ferrosilicon, aluminum alloy, silicon alloy and the like, and the addition amount is preferably 0.01 to 3 parts by mass with respect to 100 parts by mass of the refractory powder.
[0044]
　The wet spraying material can be prepared by adding water to an irregularly shaped refractory containing a refractory powder and alumina cement and kneading it to prepare a muddy and adding a calcium hydroxide slurry to the muddle . When used in combination with calcium chloride, a wet type spraying material can be prepared by adding calcium hydroxide slurry and a mixture of calcium chloride to a mud.
[0045]
　The amount of water added when preparing the mud is not particularly limited, but it is generally preferably 3 to 15 parts by mass, more preferably 5 to 12 parts by mass, based on 100 parts by mass of the monolithic refractory Is further preferred.
[0046]
　The amount of the calcium hydroxide slurry added to the monolithic refractory is preferably in the range of 0.3 to 1.5 parts by mass with respect to 100 parts by mass of the monolithic refractory.
[0047]
　The quick-setting admixture of the present invention may contain a dispersant, a dispersed state stabilizer, a bubble agent and the like.
[0048]
　As the dispersant, the same ones as those contained in the monolithic refractory can be mentioned.
[0049]
　Examples of the dispersion state stabilizer include inorganic thickeners such as silicic anhydride and clay, and water-soluble polymers such as CMC, PVA and polyacrylate.
[0050]
　The foaming agent is a substance which causes air bubbles to adhere to the particle surface of calcium hydroxide and suppresses sedimentation due to the buoyancy of the air bubbles, and examples thereof include various surfactants such as lauryl sulfate.
Example
[0051]
　
　Example 1 A calcium hydroxide slurry having a
　solid content concentration of 16.0% by mass and a BET specific surface area of ​​6.0 m 2 / g was charged in a bead mill (Dyno-Mill KDL-PILOT manufactured by Wiley & Type) at a flow rate of 15 kg / h to prepare calcium hydroxide slurry having a BET specific surface area of ​​11.4 m 2 / g and a sedimentation volume of 54 ml / 60 min at a concentration of 2 mass%. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0052]
　(Example 2)
　A BET specific surface area of ​​10.5 m 2 / g, a sedimentation volume of 42 ml / 60 min at a concentration of 2 mass%, and a sedimentation volume of 40 ml / 60 min were obtained in the same manner as in Example 1, except that the flow rate in the wet grinding treatment was 20 kg / Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0053]
　Example 3
　BET specific surface area of ​​9.7 m 2 / g, sedimentation volume of 35 ml / 60 min at a concentration of 2 mass% was obtained in the same manner as in Example 1, except that the flow rate in wet grinding treatment was 25 kg / h Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0054]
　Example 4
　BET specific surface area was 9.6 m 2 / g, sedimentation volume at a concentration of 2 mass% was 30 ml / 60 min in the same manner as in Example 1, except that the flow rate in the wet grinding treatment was 35 kg / h Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0055]
　Example 5 The
　procedure of Example 1 was repeated except that the flow rate in the wet grinding treatment was 45 kg / h, the BET specific surface area was 9.2 m 2 / g, the sedimentation volume at a concentration of 2% by mass was 28 ml / 60 min Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0056]
　(Example 6)
　A BET specific surface area of ​​8.9 m 2 / g, a sedimentation volume of 25 ml / 60 min at a concentration of 2 mass%, and a sedimentation volume of 25 ml / 60 min were obtained in the same manner as in Example 1, except that the flow rate in the wet grinding treatment was 70 kg / Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0057]
　Example 7
　BET specific surface area of ​​7.7 m 2 / g, a sedimentation volume of 18 ml / 60 min at a concentration of 2 mass% was obtained in the same manner as in Example 1, except that the flow rate in the wet grinding treatment was 100 kg / Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0058]
　Example 8 In the same
　manner as in Example 1 except that the flow rate in the wet grinding treatment was 200 kg / h, a BET specific surface area of ​​6.5 m 2 / g, a sedimentation volume at a concentration of 2% by mass of 10 ml / 60 min Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0059]
　Comparative Example 1 A calcium hydroxide slurry having a
　solid content concentration of 16.0 mass% and a BET specific surface area of ​​6.5 m 2 / g was charged at a flow rate of 3 kg / h with a bead mill (Dyno-Mill KDL-PILOT type manufactured by Willy E. Bacoffen) Wet grinding treatment was carried out to prepare a calcium hydroxide slurry having a BET specific surface area of ​​17.5 m 2 / g and a sedimentation volume of 98 ml / 60 min at a concentration of 2 mass%. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0060]
　Comparative Example 2
　BET specific surface area was 9.0 m 2 / g, sedimentation volume at 2 mass% concentration was 62 ml / 60 min (Comparative Example 2), except that the flow rate in the wet grinding treatment was 10 kg / h, Of calcium hydroxide slurry was prepared. The oxalic acid reactivity and viscosity of the obtained calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0061]
　Comparative Example 3 A calcium hydroxide slurry having a
　BET specific surface area of ​​20.3 m 2 / g was prepared and used without wet grinding treatment. The sedimentation volume, oxalic acid reactivity and viscosity at 2 mass% concentration of the calcium hydroxide slurry were measured, and the measurement results are shown in Table 1.
[0062]
　 In the
　examples 1 to 8 and the comparative examples 1 to 3, the fastening agent was prepared using the calcium hydroxide slurry alone with the mass ratio of calcium hydroxide: calcium chloride being 100: 0 .
[0063]
　In Examples 9 to 12 and Comparative Example 4, the mass ratio of calcium hydroxide: calcium chloride was set to 90:10 (Example 9), 80:20 (Example 10), 70:30 (Example 11) 50: 50 (Example 12) and 40: 60 (Comparative Example 4). As the calcium hydroxide slurry, the calcium hydroxide slurry of Example 4 was used.
[0064]
　In Example 13 and Comparative Example 5, the mass ratio of calcium hydroxide: calcium chloride was 80:20, the total content of calcium hydroxide and calcium chloride in the quick-filling agent was 45 mass% (Example 13) And 50 mass% (Comparative Example 5), respectively.
[0065]
　
　[Measurement of Viscosity]
　Viscosity was measured for each of the prepared quick setting agents. The viscosity was measured using a B type viscometer (Tokyo Keiki). Specifically, the viscosity value was measured 1 minute after calcium chloride was dissolved in only calcium hydroxide slurry or calcium hydroxide slurry.
[0066]
　[Evaluation in Wet Blow Material Construction]
　Cohesive property, curability and rebound loss in the application of the wet type spraying material were evaluated using the rapid filling agents of the above examples and comparative examples.
[0067]
　The measurement conditions for wet spraying will be described below.
[0068]
　The wet spraying apparatus is equipped with a pressure pump (manufactured by Sayama Seisakusho) which feeds the kneaded amorphous refractory to the pressure feed pipe, and a pressure feed pipe is connected to the pressure feed pump. The pressure feed pipe was equipped with an iron pipe with an inner diameter of 2.0 inches 20 m and further equipped with a pressure reducer hose with an inner diameter of 1.5 inches via a reducer with a length of 10 m. Also, a tip of a pressure-resistant hose connected with a nozzle with a pre-drawing rubber was used. Transportation and supply of the quick-setting admixture to the monolithic refractory was carried out through a quick-filling agent supply pipe connected to a rubber nozzle using compressed air as a carrier, using a Moono pump having a snake pump.
[0069]
　The surface to be processed was made of concrete wall, and the construction thickness was 150 mm.
[0070]
　The monolithic refractory is composed of alumina having a particle size of 1 to 5 mm and mullite of 33% by mass and alumina having a particle size of 1 mm or less and 48% by mass as calcined alumina as a refining powder, and silica A mixture of 100 mass% of fume 5 mass% and alumina cement 7 mass% as a binder and 0.1 mass% of sodium tripolyphosphate as a dispersing agent was added by extrusion was used. For the construction, 7.8 mass% of construction water was added and thoroughly kneaded in advance with a mixer. The addition amount of the quick-setting admixture was 0.3% by mass on the outside with respect to the monolithic refractory (the amount excluding the construction water content).
[0071]
　Next, evaluation methods of cohesiveness and curability will be described.
[0072]
　(Cohesive Property) In
　the case of adding 2% by mass of a quick-setting admixture to 500 g of a kneaded mixture of water and a wet type spraying material, cohesiveness when quickly kneaded by hand was evaluated. Specifically, the time when the material became damaged was visually evaluated. If the time of becoming damaged was within 10 seconds, it was evaluated as .largecircle., When it was within 8 seconds, it was evaluated as .largecircle. .
[0073]
　(
　Curability ) The curing property was evaluated by measuring the penetration resistance using a penetration hardness meter with a tip of 6 mmφ against the workpiece obtained by spraying and measuring the penetration resistance until reaching about 3.5 MPa did.
[0074]
　The curing time was determined by measuring penetration resistance using a penetrometer with a tip of 6 mmφ against the workpiece obtained by spraying and measuring the penetration resistance within 2 hours or less depending on the time until penetration resistance reached about 3.5 MPa The case was evaluated as ◯, and the case where it exceeded 2 hours was evaluated as x. In the case of more than 2 hours, when the construction body was tilted, there was a possibility that the construction body would fall and the work process was delayed, so it was marked as "x".
[0075]
　(Rebound loss) The
　rebound loss is often 20% by mass or more (x), the amount dropped in rebound without adhering to the surface to be coated after spraying, against the total kneading amount of irregular refractories The case of less than% by weight was defined as less (o).
[0076]
　Evaluation results of quick filler are shown in Tables 1 to 3.
[0077]
[table 1]

[0078]
　As shown in Table 1, it can be seen that the quick-setting admixtures of Examples 1 to 8 according to the present invention have good cohesiveness and curability, and rebound loss is small. In the quick-setting admixtures of Comparative Example 1 and Comparative Example 2, clogging due to adhesion occurred within the quick-filler supply pipe, spraying work was not possible and curability and rebound loss could not be measured. On the other hand, the quick-setting admixtures of Examples 1 to 8 did not cause clogging due to adhesion in the quick-filler supply pipe and were excellent in workability.
[0079]
　The quick-setting admixture of Comparative Example 3 whose oxalic acid reactivity is outside the range of the present invention is inferior in cohesiveness and rebound loss is increased.
[0080]
[Table 2]

[0081]
　As shown in Table 2, by setting the content ratio of calcium hydroxide: calcium chloride
within the range of 50: 50 to 100 : 0, good curability can be obtained and the rebound loss can be reduced.
[0082]
[Table 3]

[0083]
　As shown in Table 3, by setting the total content of calcium hydroxide and calcium chloride in the quick-filling agent to less than 46 mass%, good curability can be obtained and rebound loss can be reduced.
The scope of the claims
[Claim 1]
　An accelerator for a wet type spraying material of an irregular refractory prepared from a calcium hydroxide slurry to which calcium chloride is added as necessary,
　wherein the calcium hydroxide slurry has an oxalic acid reactivity, Sedimentation volume, and viscosity, respectively, are oxalic acid reactivity: 40 minutes or less, sedimentation volume: less than 60 ml, and viscosity: less than 200 mPa · S, and
　the total content of calcium hydroxide and calcium chloride in the quick- , The content of calcium hydroxide: calcium chloride is less than 46 mass%, and the content ratio of calcium hydroxide: calcium chloride is in the range of 50: 50 to 100: 0.
　Oxalic Acid Reactivity: 50 g of calcium hydroxide slurry prepared at a concentration of 5% by mass and kept at 25 ± 1 ° C. was added with 40 g of oxalic acid aqueous solution having a concentration of 0.5 mol / liter kept at 25 ± 1 ° C. (Min) Time to reach pH 7.0 after addition
　Sedimentation volume: Calcium hydroxide slurry adjusted to a concentration of 2% by mass was placed in a 100 ml graduated cylinder and allowed to stand at room temperature for 1 hour Settled volume
　viscosity to be measured later : Viscosity when calcium hydroxide slurry adjusted to a concentration of 8 mass% is measured with a B type viscometer
[Claim 2]
　2. The quick-setting admixture for a wet type spraying material according to claim 1, wherein the oxalic acid reactivity is 20 minutes or less.
[Claim 3]
3. The quick-setting admixture for a wet-type spraying material according to claim 1 or 2, wherein the 　calcium hydroxide has a BET specific surface area of ​​5 m 2 / g or more.
[Claim 4]
　A step of subjecting the calcium hydroxide slurry to a
　milling treatment , a step of drying the calcium hydroxide slurry after the milling treatment to powder calcium
　hydroxide, adding water to the powdered calcium hydroxide And a step of preparing a calcium hydroxide slurry and adding calcium chloride as necessary to the obtained calcium hydroxide slurry to prepare a quick setting admixture according to any one of claims 1 to 3 A method for producing a quick setting agent for a wet type spraying material.
[Claim 5]
　A wet spray comprising the refractory powder, alumina cement and the quick-setting admixture according to any one of claims 1 to 3.
[Claim 6]
　Water is added to an irregular refractory including a refractory powder and alumina cement, and the mixture is kneaded to prepare a muddy object, and the quick-setting admixture according to any one of claims 1 to 3 is added to the muddle A method of constructing a wet type spraying material by spraying a wet type spraying material.