A hot-dip galvanizing control agent and a method for preparing the same

Abstract

The application relates to the technical field of hot-dip galvanizing, and discloses a hot-dip galvanizing control agent and a preparation method thereof, which comprises a solid adhesion agent, a liquid adhesion agent, refractory aggregate, a dispersing agent and water; the solid adhesion agent comprises washed kaolin, calcined kaolin and bentonite; the proportion of the washed kaolin and the calcined kaolin is between 1:2 and 1:5; the proportion of the total amount of the washed kaolin and the calcined kaolin and the bentonite is between 1:0.02 and 0.1; the washed kaolin is a 325-mesh powder; and the calcined kaolin is a 325-mesh powder. The control agent is coated on the area of a steel member that does not need to be galvanized before the steel member is immersed into a zinc pot after being assisted with galvanization, so that the surface of the steel member is prevented from directly contacting with zinc liquid, the purpose of controlling the area from being galvanized is achieved, and normal galvanization of other areas is not affected; the application avoids the trouble of implementing local depolarization after hot-dip galvanizing, reduces the use of zinc liquid, reduces production cost and has other advantages.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot-dip galvanizing, in particular to a hot-dip galvanizing control agent and a preparation method thereof. BACKGROUND

[0002] Hot-dip galvanizing is to immerse the steel member after rust removal into high-temperature molten zinc liquid, so that a layer of zinc is attached to the surface of the steel member, thereby achieving the purpose of corrosion protection.

[0003] At present, some steel members are not allowed to be immersed in zinc, and some steel members are subjected to overall hot-dip galvanizing, and then the local area is cleaned. This method is time-consuming and laborious, wastes raw materials, and has high cost. Some are pre-coated with ordinary refractory clay and high-aluminum soil and other mineral raw materials. Although the price is relatively low, these materials have a high content of impurities, especially metallic iron, metallic sodium and metallic potassium. Water glass is a very good and low-cost liquid binder, but its main component is NaO.nSiO2, and it contains a high content of metallic iron oxide. If a large amount of these raw materials is used, the alkali metal oxides, metallic iron oxides and silicon dioxide contained in the raw materials will be brought into the zinc liquid in large quantities, thereby affecting the stability of the zinc liquid and the quality of the hot-dip galvanizing product. If a large amount of iron elements are introduced into the zinc liquid, when the content of iron elements exceeds 0.03wt% (the maximum solubility of iron in the zinc liquid), iron and zinc will combine to form iron-zinc alloy, which will sink to the bottom of the pot, i.e. bottom slag. Iron is also easy to combine with aluminum to form bottom slag, which reduces the content of effective aluminum in the zinc liquid. In addition, the presence of iron increases the viscosity and surface tension of the zinc liquid, thereby deteriorating the wetting conditions of the zinc liquid for the steel plate, prolonging the immersion time of the zinc liquid, and improving the space. In view of this, a hot-dip galvanizing control agent and a preparation method thereof are proposed to solve the above problems. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the deficiencies of the prior art, the present application provides a hot-dip galvanizing control agent and a preparation method thereof. The control agent is coated on the area of the steel member that does not need to be galvanized before the steel member is immersed in the zinc pot after the galvanizing of the steel member is assisted. The purpose of controlling the area not to be galvanized can be achieved, and the normal galvanizing of other areas is not affected. The trouble of implementing local deplating after hot-dip galvanizing is avoided, the use of zinc liquid is reduced, the production cost is reduced, and other advantages are achieved. The problems of cleaning the part that does not need to be hot-dip galvanized after overall hot-dip galvanizing, and the high content of impurities in ordinary refractory clay and water glass affecting the quality of the hot-dip galvanizing zinc liquid are solved.

[0006] (II) Technical solutions

[0007] In order to achieve the above-mentioned purpose of controlling the area not to be plated with zinc after the steel member is plated with zinc, the control agent is coated on the area of the steel member not to be plated with zinc, so as to block the direct contact of the surface of the steel member with the zinc liquid, thereby achieving the purpose of controlling the area not to be plated with zinc, without affecting the normal plating of zinc in other areas, avoiding the trouble of implementing local deplating after hot-dip zinc plating, reducing the use of zinc liquid, and reducing the production cost and the like.

[0008] Preferably, the solid adhesive agent comprises washed kaolin, calcined kaolin, and bentonite, the ratio of the washed kaolin and the calcined kaolin is between 1:2 and 1:5, and the ratio of the total amount of the washed kaolin and the calcined kaolin to the bentonite is between 1:0.02 and 0.1.

[0009] Preferably, the washed kaolin is a 325-mesh powder, the kaolin content of the washed kaolin is ≥98wt%, the calcined kaolin is a 325-mesh powder, the metakaolin content of the calcined kaolin is ≥99wt%, the bentonite is calcium-based bentonite with a montmorillonite content of 85-90wt% or organic bentonite with a montmorillonite content of ≥70wt%, and the bentonite is a 200-mesh powder.

[0010] Preferably, the liquid adhesive agent is aluminum sol or liquid aluminum dihydrogen phosphate, and one of them is selected as the liquid binder of the zinc-plated surface control agent. The aluminum sol is an acidic aluminum sol with a solid content of 10-20wt%, the liquid aluminum dihydrogen phosphate has a phosphorus pentoxide content of 33±1wt%, an aluminum trioxide content of 8.5±0.5wt%, and an iron trioxide content of ≤0.1wt%.

[0011] Preferably, the refractory aggregate comprises ordinary alumina powder, calcined alumina powder, and acicular wollastonite powder, the weight ratio of the ordinary alumina powder and the calcined alumina powder is between 1:0.5 and 1:3, the weight ratio of the total amount of the ordinary alumina powder and the calcined alumina powder to the acicular wollastonite powder is between 1:0.02 and 1:0.1, the aluminum trioxide content of the alumina powder and the calcined alumina powder is ≥99wt%, the fineness of the alumina powder and the calcined alumina powder is 200 mesh, the acicular wollastonite powder has a calcium oxide content of ≥46wt%, a silicon dioxide content of ≥50wt%, an iron trioxide content of ≤0.50wt%, and a length-diameter ratio of 15-20.

[0012] Preferably, the weight ratio of the solid adhesive agent and the refractory aggregate is between 1:1 and 1:3, the weight ratio of the liquid binder to water is between 1:0.5 and 1:3, and the weight ratio between the liquid and the solid powder is between 1:1 and 1:3.

[0013] Preferably, the dispersant is one or a combination of carboxymethyl cellulose, a 1 wt% solution thereof, and polyvinyl alcohol, a 5 wt% solution thereof.

[0014] Preferably, the water is tap water.

[0015] The present application also provides a hot-dip galvanizing control agent and a preparation method thereof, and the technical solution is as follows, comprising the following steps:

[0016] 1) Add water, solid adhesion agent, dispersant and wollastonite in a container according to the proportion;

[0017] 2) Stir with a stirrer to obtain a uniformly dispersed slurry;

[0018] 3) Continue to add refractory aggregate and liquid binder to the slurry obtained in step 2 according to the proportion;

[0019] 4) Continue to stir to obtain a slurry or paste with a certain viscosity.

[0020] (Three) beneficial effects

[0021] Compared with the prior art, the present application provides a hot-dip galvanizing control agent and a preparation method thereof, which has the following beneficial effects:

[0022] The hot-dip galvanizing control agent and the preparation method thereof are prepared by mixing solid adhesives, refractory aggregates, liquid adhesives, dispersants and water, and the main raw materials of the refractory aggregates are alumina, aluminosilicate, calcium silicate, aluminum phosphate and a small amount of organic matter, and the overall high-temperature resistance can reach above 1000℃. After high-temperature treatment in a hot-dip galvanizing pot, more than 99wt% of the solid substances are taken out by the steel member or floated on the surface of the zinc liquid to become zinc ash, and only a very small amount of metallic iron, alkali metal oxides, silicon dioxide and other trace elements are dissolved in the zinc liquid or suspended in the zinc liquid, which has basically no effect on the stability of the zinc liquid. The solid adhesives include water-washed kaolin, calcined kaolin and bentonite, the water-washed kaolin and the calcined kaolin are in a ratio of 1:2-1:5, and the total amount of the water-washed kaolin and the calcined kaolin and the bentonite are in a ratio of 1:0.02-0.1. The water-washed kaolin, the calcined kaolin and the bentonite in the solid adhesives are combined to form the solid adhesives, and the refractory temperature of each of the three substances is above 1000℃. The refractory aggregates of the galvanizing surface control agent include alumina powder, calcined alumina powder and wollastonite, and the refractory temperature of each of the three substances is above 1200℃. The liquid adhesives of the galvanizing surface control agent are selected from aluminum sol and aluminum dihydrogen phosphate, and one of the two is selected as the liquid adhesive of the galvanizing surface control agent. The calcined kaolin and the calcined alumina are both high-temperature calcined products, and the ordinary alumina powder has a very low water content. After entering the zinc liquid, the ordinary alumina powder will not deform and crack due to dehydration. A small amount of needle-like wollastonite powder has good toughening effect and can effectively reduce the cracks caused by high-temperature dehydration, prevent local hot-dip galvanizing failure, and has the functions of coating the control agent on the steel member in the area not needing galvanizing before the steel member is immersed in the zinc pot, blocking the direct contact of the surface of the steel member with the zinc liquid, and achieving the purpose of controlling the area not needing galvanizing. In addition, the control agent does not affect the normal galvanizing of other areas, avoids the trouble of implementing local depolarization after hot-dip galvanizing, reduces the use of zinc liquid, and reduces the production cost. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] The present application provides a hot-dip galvanizing control agent and a preparation method thereof, which comprises solid adhesives, liquid adhesives, refractory aggregates, dispersants and water.

[0025] In the present application, the solid adhesives include water-washed kaolin, calcined kaolin and bentonite, the ratio of the water-washed kaolin and the calcined kaolin is between 1:2 and 1:5, and the ratio of the total amount of the water-washed kaolin and the calcined kaolin and the bentonite is between 1:0.02 and 0.1. The water-washed kaolin, the calcined kaolin and the bentonite in the solid adhesives are combined to form the solid adhesives, and the refractory temperature of each of the three substances is above 1000℃.

[0026] It should be noted that the calcined kaolin and the calcined alumina are both high-temperature calcined, and the ordinary alumina powder has very low water content, so that after entering the zinc liquid, it will not cause large deformation and cracks due to dehydration, and a small amount of acicular wollastonite powder has good toughening effect, which can effectively reduce the cracks caused by high-temperature dehydration and prevent local hot-dip galvanizing failure. The selected water-washed kaolin has good cohesiveness, plasticity, dispersibility and fire resistance, but the high-temperature shrinkage is relatively high, and the addition amount should not be too high.

[0027] It should be further pointed out that the fineness of the solid particles determines the effect of local zinc layer control of hot-dip galvanizing to some extent. The finer the solid particles, the more dense the aggregate adhering to the surface of the steel member, and the more difficult the zinc liquid to contact the surface of the steel member through the gap. However, the finer the aggregate, the lower the adhesion strength, and it is easy to fall off during hot-dip galvanizing, affecting the control effect.

[0028] In the present application, the water-washed kaolin is a 325 mesh powder, the kaolin content of the water-washed kaolin is ≥98wt%, the calcined kaolin is a 325 mesh powder, the metakaolin content of the calcined kaolin is ≥99wt%, the bentonite is a calcium-based bentonite with a montmorillonite content of 85-90wt% or an organic bentonite with a montmorillonite content of ≥70wt%, and the bentonite is a 200 mesh powder.

[0029] In the present application, the liquid adhesive is an aluminum sol or a liquid aluminum dihydrogen phosphate, and one of them is optionally used as a liquid binder of the zinc-plated surface control agent. The aluminum sol is an acidic aluminum sol with a solid content of 10-20wt%, and the liquid aluminum dihydrogen phosphate has a P2O5 content of 33±1wt%, an aluminum trioxide content of 8.5±0.5wt%, and an iron trioxide content of ≤0.1wt%.

[0030] It should be noted that the aluminum sol and the liquid aluminum dihydrogen phosphate are used as liquid binders because the aluminum sol is a nanoparticle and the aluminum dihydrogen phosphate is a liquid binder, both of which have good binding effect, and the iron impurities, alkali metal impurities and silicon dioxide impurities of both are very low, which has little effect on the hot-dip galvanizing zinc liquid and can be ignored.

[0031] In the present application, the refractory aggregate comprises ordinary alumina powder, calcined alumina powder and acicular wollastonite powder, optionally one, two or three of which is used as the refractory aggregate of the galvanizing surface control agent, all of which have a refractory temperature of 1200℃ or above, the weight ratio of the ordinary alumina powder and the calcined alumina powder is 1:0.5-3, the weight ratio of the total weight of the ordinary alumina powder and the calcined alumina powder to the acicular wollastonite powder is 1:0.02-0.1, the content of aluminum trioxide in the alumina powder and the calcined alumina powder is ≥99wt%, the fineness of the alumina powder and the calcined alumina powder is 200 mesh, the content of calcium oxide in the acicular wollastonite powder is ≥46wt%, the content of silicon dioxide is ≥50wt%, the content of ferric trioxide is ≤0.50wt%, and the aspect ratio is 15-20, the main raw materials involved are alumina, aluminosilicate, calcium silicate, aluminum phosphate and a small amount of organic matter, etc., the overall high-temperature resistance can reach 1000℃ or above, the iron content is all below 0.5wt%, the total content is below 0.2wt%, the total content of alkali metal and silicon dioxide is below 1wt%, after high-temperature hot-dip galvanizing, 99wt% or more of the solid matter is taken out by the steel member or floated on the surface of the zinc liquid to become zinc ash, only a very small amount of metallic iron, alkali metal oxides, silicon dioxide and other trace elements are dissolved in the zinc liquid or suspended in the interior of the zinc liquid, which basically has no effect on the stability of the zinc liquid.

[0032] The present application also provides that the weight ratio of the solid adhesive and the refractory aggregate is 1:1-1:3, the weight ratio of the liquid binder and water is 1:0.5-3, and the weight ratio between the liquid and the solid powder is 1:1-1:3.

[0033] In the present application, the dispersant is one or a combination of carboxymethyl cellulose and polyvinyl alcohol, the carboxymethyl cellulose is a 1wt% solution, and the polyvinyl alcohol is a 5wt% solution.

[0034] The present application also provides that the water is tap water.

[0035] The present application also provides a preparation method of the hot-dip galvanizing control agent, which comprises the following steps:

[0036] 1) First, add water, solid adhesive, dispersant and wollastonite in a container according to the proportion;

[0037] 2) Stir with a stirrer to obtain a uniformly dispersed mud;

[0038] 3) Continue to add refractory aggregate and liquid binder to the mud obtained in step 2 according to the proportion;

[0039] 4) Continue to stir to obtain mud or mud paste with certain viscosity.

[0040] Example one: the present application provides a hot-dip galvanizing control agent and its preparation method, with a mine anchor rod with fine tooth screw at one end, the customer requires no galvanizing, so that the nut can not be normally installed, the whole length of the mine anchor rod is 2200mm, the diameter is 20mm, and the length of 1900mm at one end is thick tooth screw, and the length of 300mm at the other end of the screw is fine tooth screw, wherein the fine tooth screw is not allowed to be galvanized.

[0041] First, configure the hot-dip galvanizing local control agent, the formula is as follows:

[0042]

[0043] According to the above ratio, first take 400g of water washed kaolin, 1660g of calcined kaolin, 80g of organic bentonite, 100g of acicular wollastonite powder, 1900g of water, 20g of CMC (1wt%) solution, mix and stir evenly with a blender, obtain a uniform flow and sticky mud, then take 1180g of ordinary alumina powder, 1580g of calcined alumina powder, 900g of liquid aluminum dihydrogen phosphate, add to the stirred mud, continue to stir until a thick slurry is obtained.

[0044] Insert the fine tooth screw end of the mine anchor rod with plating film into the mixed mud paste, and rotate two to three times, to ensure that the fine tooth screw is completely covered with mud paste, and then immerse it in the hot-dip galvanizing zinc pot for hot-dip galvanizing operation, the mud covering layer is extremely easy to peel off after zinc immersion, and no zinc penetration or zinc layer is found in the covered protection area, the most useful brush is used to clean the residual zinc skin and solid powder on the thread tooth surface, and a layer of self-spraying zinc repair is sprayed.

[0045] Example two: the present application provides a hot-dip galvanizing control agent and its preparation method, taking a steel member with internal screw hole as an example, such as left box column, right box column and column bottom plate, each set of column and column bottom plate has 4 M5, 2 M6 and 18 M8 screw holes and 19 f4.5 sliding holes, a total of 43 holes, which need to be controlled to prevent normal installation after galvanizing.

[0046] First, configure the hot-dip galvanizing local control agent, the formula is as follows:

[0047]

[0048] According to the above ratio, first, take 320g of washed kaolin, 1150g of calcined kaolin, 120g of calcium bentonite, 160g of acicular wollastonite powder, 1450g of water, 20g of PVA (5wt%) solution, mix and stir evenly with a blender to obtain a uniform flow and sticky mud, then take 1000g of ordinary alumina powder, 2250g of calcined alumina powder, 1150g of aluminum sol, add to the stirred mud, continue to stir until a uniform sticky paste is obtained.

[0049] After the workpiece to be protected is assisted plating, a protective film of the plating aid is formed, a brush of appropriate size is used to dip the prepared mud paste, and the mud paste is evenly applied 3-5 times in the screw hole or sliding hole to be protected, or a self-made glue gun is used to inject the mud paste into the screw hole or sliding hole to be protected, to ensure that all the threads and surfaces are covered with a thick layer of mud paste, and then the workpiece is immersed in a hot-dip zinc pot for hot-dip zinc plating. After hot-dip zinc plating, the mud paste covering layer is easily peeled off, and no zinc penetration or zinc plating is found in the covered and protected area. Finally, the remaining zinc skin and solid powder on the surface of the threads or sliding hole are cleaned with a brush, and a layer of self-spraying zinc repair is sprayed.

[0050] Example Three: The present application provides a hot-dip zinc plating control agent and a preparation method thereof. The mining anchor rod has a fine-threaded screw at one end, and the customer requires that the screw cannot be plated with zinc to prevent the nut from being unable to be normally installed.

[0051] The mining anchor rod has a length of 2400mm and a diameter of 22mm, and the 2100mm long end is a coarse-threaded screw rod, and the 300mm long end is a fine-threaded screw. The fine-threaded screw is not allowed to be plated with zinc.

[0052] First, the hot-dip zinc local control agent is configured, and the formula is as follows:

[0053]

[0054] According to the above ratio, first, take 320g of washed kaolin, 1150g of calcined kaolin, 120g of calcium bentonite, 160g of acicular wollastonite powder, 1450g of water, 20g of PVA (5wt%) solution, mix and stir evenly with a blender to obtain a uniform flow and sticky mud, then take 1000g of ordinary alumina powder, 2250g of calcined alumina powder, 1150g of aluminum sol, add to the stirred mud, continue to stir until a uniform sticky paste is obtained.

[0055] The fine thread screw end of the mine anchor rod with the plating aid film is inserted into the mixed mud paste, and is rotated for two to three times, so that the fine thread screw is covered by the mud paste, and the fine thread screw can be immersed into the hot-dip zinc pot for hot-dip zinc operation. After the hot-dip zinc operation, the mud paste covering layer is easy to peel off, and the phenomenon of zinc penetration or zinc plating is not found in the covering protection area. The residual zinc skin and solid powder on the thread surface are cleaned by using a brush, and a self-spraying zinc repair layer is sprayed.

[0056] The beneficial effects of the present application are:

[0057] The main raw material of the refractory aggregate, alumina, aluminosilicate, calcium silicate, aluminum phosphate and a small amount of organic matter, etc. are mixed by solid adhesive, refractory aggregate, liquid adhesive, dispersant and water. The overall high temperature resistance can reach above 1000℃, the iron content is below 0.5wt%, the total content is below 0.2wt%, the total content of alkali metal and silicon dioxide is below 1wt%, after hot dipping zinc zinc pot high temperature, more than 99wt% of the solid matter is taken out by the steel member or floated on the surface of the zinc liquid to become zinc ash, only a very small amount of metallic iron, alkali metal oxide, silicon dioxide and other trace elements are dissolved in the zinc liquid or suspended in the zinc liquid, which has little effect on the stability of the zinc liquid, the solid adhesive includes water-washed kaolin, calcined kaolin and bentonite, any two or three of which are combined to form the solid adhesive, the refractory temperature of the solid adhesive is above 1000℃, the refractory aggregate includes alumina powder, calcined alumina powder and wollastonite, any one, two or three of which is selected as the refractory aggregate of the galvanizing surface control agent, the refractory temperature of the refractory aggregate is above 1200℃, the liquid adhesive includes aluminum sol and aluminum dihydrogen phosphate, any one of which is selected as the liquid adhesive of the galvanizing surface control agent, the calcined kaolin and the calcined alumina are both high-temperature calcined, and the ordinary alumina powder has very low water content, so that it will not deform and crack after entering the zinc liquid, and a small amount of needle-like wollastonite powder has good toughening effect, which can effectively reduce the cracks caused by high-temperature dehydration and prevent local hot-dip galvanizing failure. The selected water-washed kaolin has good adhesion, plasticity, dispersibility and refractoriness, the fineness of the solid particles determines the effect of local hot-dip galvanizing to some extent, the finer the solid particles, the more compact the aggregate adhered to the surface of the steel member, and the more difficult the zinc liquid to contact the surface of the steel member through the gap, but the finer the aggregate, the lower the adhesion strength, which is easy to fall off during hot-dip galvanizing and affects the control effect, the aluminum sol and the liquid aluminum dihydrogen phosphate are used as the liquid adhesive because the aluminum sol is a nano particle and the liquid aluminum dihydrogen phosphate has good adhesion effect, and the iron impurities, alkali metal impurities and silicon dioxide impurities of the two are very low, which has little effect on the hot-dip galvanizing zinc liquid and can be ignored, the control agent is coated on the steel member in the area which does not need to be galvanized before the steel member is immersed in the zinc pot, which blocks the direct contact between the surface of the steel member and the zinc liquid, and achieves the purpose of controlling the area without galvanizing, and does not affect the normal galvanizing of other areas, avoids the trouble of local stripping after hot-dip galvanizing, reduces the use of zinc liquid and lowers the production cost.

[0058] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hot-dip galvanizing control agent, characterized in that, The formulation comprises: a solid adhesive, a liquid adhesive, refractory aggregates, a dispersant, and water. The solid adhesive includes washed kaolin, calcined kaolin, and bentonite. The ratio of washed kaolin to calcined kaolin is between 1:2 and 1:5, and the ratio of the total amount of washed kaolin and calcined kaolin to bentonite is 1:0.02-0.

1. The liquid adhesive is either alumina sol or liquid aluminum dihydrogen phosphate. The alumina sol has a solid content of 10-20 wt% acidic alumina sol. The liquid aluminum dihydrogen phosphate contains 33±1 wt% phosphorus pentoxide, 8.5±0.5 wt% aluminum oxide, and ≤0.1 wt% ferric oxide. The refractory aggregates include ordinary alumina powder, calcined alumina powder, and needle-like wollastonite powder. The ordinary alumina powder and calcined... The weight ratio of alumina powder is 1:0.5-3, the weight ratio of the total weight of ordinary alumina powder and calcined alumina powder to the weight of acicular wollastonite powder is 1:0.02-0.1, the alumina content in the alumina powder and calcined alumina powder is ≥99wt%, the fineness of the alumina powder and calcined alumina powder is 200 mesh, the fineness of the acicular wollastonite powder is 200 mesh, the content of calcium oxide is ≥46wt%, the content of silicon dioxide is ≥50wt%, the content of ferric oxide is ≤0.50wt%, the aspect ratio is 15-20, the weight ratio of the solid adhesive to the refractory aggregate is 1:1-1:3, the weight ratio of the liquid adhesive to water is 1:0.5-3, and the weight ratio between the liquid and the solid powder is 1:1-1:

3.

2. The hot-dip galvanizing control agent according to claim 1, characterized in that, The washed kaolin is 325 mesh powder, and the kaolin content of the washed kaolin is ≥98wt%. The calcined kaolin is 325 mesh powder, and the metakaolin content of the calcined kaolin is ≥99wt%. The bentonite is calcium-based bentonite with a montmorillonite content of 85-90wt% or organic bentonite with a montmorillonite content of ≥70wt%. The bentonite is 200 mesh powder.

3. The hot-dip galvanizing control agent according to claim 1, characterized in that, The dispersant is one or a combination of carboxymethyl cellulose and polyvinyl alcohol, wherein the carboxymethyl cellulose is a 1 wt% solution and the polyvinyl alcohol is a 5 wt% solution.

4. The hot-dip galvanizing control agent according to claim 1, characterized in that, The water in question is tap water.

5. A hot-dip galvanizing control agent according to any one of claims 1-4, characterized in that, Includes the following steps: 1) Add water, solid adhesive, dispersant, and needle-shaped wollastonite to the container according to the mixing ratio; 2) Stir with a mixer to obtain a uniformly dispersed slurry; 3) Add the remaining refractory aggregates and liquid binder to the slurry obtained in step 2 in proportion; 4) Continue stirring to obtain a mud or paste with a certain viscosity.

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