CN117089223A - Barite powder and preparation method and application thereof - Google Patents
Barite powder and preparation method and application thereof Download PDFInfo
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- CN117089223A CN117089223A CN202311051761.5A CN202311051761A CN117089223A CN 117089223 A CN117089223 A CN 117089223A CN 202311051761 A CN202311051761 A CN 202311051761A CN 117089223 A CN117089223 A CN 117089223A
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
The invention belongs to the technical field of inorganic fillers, and provides barite powder, a preparation method and application thereof, which solve the problem of low filler solid content in a coating. The method comprises the following steps: grinding the barite coarse powder and the grinding aid solution to obtain intermediate powder; grinding the barite coarse powder solution and the coupling agent to obtain barium sulfate slurry; mixing the intermediate powder, barium sulfate slurry, a coupling agent and water to obtain the barite powder. The preparation method provided by the invention adopts the polyalcohol, the surfactant, the titanate coupling agent and the silane coupling agent to treat the barite powder before and after the preparation method, and has comprehensive effects of improving the dispersibility and suspension property of the barite powder and reducing the surface energy. The preparation process is relatively simple, the used equipment and auxiliary agents are all commercial mature products, and after the equipment and auxiliary agents are organically combined, the high-performance barite powder with high tap density and low surface tension can be obtained, and the effective filling rate in the epoxy primer reaches more than 65 percent.
Description
Technical Field
The invention relates to the technical field of inorganic fillers, in particular to barite powder and a preparation method and application thereof.
Background
The epoxy anticorrosive paint has excellent anticorrosive performance, and is one kind of anticorrosive paint with most application in ship, pipeline and other heavy anticorrosive fields. Because the surfaces of ships, petroleum pipelines and the like are in very bad environments, the requirements on the bottom coating of the anti-corrosion coating are high, the film thickness of the anti-corrosion coating is generally required to be 800 mu m or even more than 1000 mu m, and meanwhile, the viscosity of the coating cannot be excessively high for construction and storage effects, the coating cannot sink in the storage process, and the coating cannot sag after being coated on the surface of a substrate, and the drying time is short. The natural barite is widely applied to the epoxy heavy-duty primer due to the excellent corrosion resistance and weather resistance, and along with the increasing requirements of environmental protection and corrosion resistance, the solvent content in the epoxy primer is required to be as low as possible, i.e. the solid content (i.e. the filling proportion of filler) of the paint is required to be as high as possible, and more than 60% is required. At present, natural barite powder in China is obtained through simple one-time mechanical grinding and grading, the particle size distribution of the powder is unreasonable, so that the tap density of the product is low, the surface energy is large, and the requirement of high filling cannot be met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides barite powder, a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of barite powder, which comprises the following steps:
(1) Grinding the barite coarse powder and the grinding aid solution to obtain intermediate powder;
(2) Grinding the barite coarse powder solution and the coupling agent to obtain barium sulfate slurry;
(3) And (3) mixing the intermediate powder in the step (1), the barium sulfate slurry in the step (2), the coupling agent and water to obtain the barite powder.
Preferably, the D98 value of the barite coarse powder in step (1) is 40-55 μm;
the mass of the grinding aid in the grinding aid solution is 0.06-0.12% of the mass of the coarse powder of the barite.
Preferably, the solid content of the grinding aid solution in the step (1) is 45-55%;
the grinding aid comprises alcohol, titanate coupling agent, emulsifying agent and dispersing agent;
the alcohol is ethylene glycol and/or glycerol; the titanate coupling agent is one or more of isopropyl tri (diisooctyl pyrophosphoryloxy) titanate, isopropyl tri (ethylenediamine N-ethoxy) titanate and di (diisooctyl pyrophosphoryloxy) ethylene titanate; the emulsifier is sodium dodecyl sulfonate; the dispersing agent is sodium polyacrylate and/or sodium polycarboxylate;
the mass ratio of the alcohol to the titanate coupling agent to the emulsifier to the dispersing agent is 1:0.1 to 0.5:0.2 to 0.7: 1.2-2.
Preferably, the frequency of the grinding in the step (1) is 15 to 20HZ, and the D98 value of the intermediate powder is 18 to 28 μm.
Preferably, the D98 value of the barite coarse powder in the barite coarse powder solution in the step (2) is 40-55 μm;
the solid content of the barite coarse powder solution is 20-40%.
Preferably, the coupling agent in the step (2) is one or more of aminopropyl trimethoxysilane, aminopropyl triethoxysilane and vinyltriethoxysilane;
the mass of the coupling agent is 0.2 to 0.6 percent of the mass of the barite coarse powder in the step (2);
the rotational speed of the grinding in the step (2) is 2000-3000 rpm.
Preferably, in the step (3), the mass ratio of the intermediate powder to the barium sulfate in the barium sulfate slurry is 1:0.2 to 0.6;
the coupling agent is one or more of aminopropyl trimethoxy silane, aminopropyl triethoxy silane and vinyl triethoxy silane;
the mass of the coupling agent is 0.3-1% of the sum of the mass of the intermediate powder and the mass of the barium sulfate in the barium sulfate slurry;
the solid content of the mixture is 30-40%.
Preferably, the stirring speed of the mixing in the step (3) is 100 to 300rpm and the time is 20 to 40 minutes.
The invention also provides the barite powder obtained by the preparation method.
The invention also provides application of the barite powder in epoxy anticorrosive paint, sound box base, yoga mat and powder paint extinction.
The invention provides a preparation method of barite powder, which comprises the following steps: grinding the barite coarse powder and the grinding aid solution to obtain intermediate powder; grinding the barite coarse powder solution and the coupling agent to obtain barium sulfate slurry; mixing the intermediate powder, barium sulfate slurry, a coupling agent and water to obtain the barite powder. According to the invention, the barite powder particles with different particle size distributions are obtained through two processes of a dry method and a wet method, and the dry method particles and the wet method particles with different particle size distributions are organically combined in a liquid phase environment to obtain the grain group with high fine powder content (the content of 2 mu m is more than 32%), large breakpoint (the D98 is more than or equal to 25 mu m) and reasonable particle group with reasonable particle size distribution, and the grain group with the particle size distribution ensures that the particles are closely stacked, the stacking density is large, and the filling rate is high.
In the preparation method provided by the invention, the compound grinding aid is adopted during dry grinding, the titanate coupling agent in the grinding aid is used for primary coating of the dry powder, and the dry powder has excellent dispersion performance; and adding a certain amount of aminosilane coupling agent when the superfine barite powder is ground by a wet method and the two subsequent barite powders are compounded, fully coating the barite particles while improving the dispersibility, reducing the surface energy of the particles, improving the compatibility and coupling effect of the barite particles and the epoxy resin, and avoiding the deterioration of the viscosity of the coating when the coating is filled at high level. The filling proportion of the barite powder in the epoxy resin is mainly determined by the grain size distribution of the barite powder and the surface energy of the grains, the organic combination of the grains with various sizes of the barite powder can effectively improve the tap density of the barite powder, namely, higher filling rate is obtained, the proper surface modification can effectively change the surface of the grains, the surface energy of the grains is reduced, the barite powder can be filled in the epoxy resin in high proportion, the viscosity of the paint is reasonable, and the construction is easy.
The preparation method provided by the invention adopts the polyalcohol, the surfactant, the titanate coupling agent and the silane coupling agent to treat the barite powder before and after the preparation method, and has comprehensive effects of improving the dispersibility and suspension property of the barite powder and reducing the surface energy. The preparation process is relatively simple, the used equipment and auxiliary agents are all commercial mature products, and after the equipment and auxiliary agents are organically combined, the high-performance barite powder with high tap density and low surface tension can be obtained, and the effective filling rate in the epoxy primer reaches more than 65 percent.
Detailed Description
The invention provides a preparation method of barite powder, which comprises the following steps:
(1) Grinding the barite coarse powder and the grinding aid solution to obtain intermediate powder;
(2) Grinding the barite coarse powder solution and the coupling agent to obtain barium sulfate slurry;
(3) And (3) mixing the intermediate powder in the step (1), the barium sulfate slurry in the step (2), the coupling agent and water to obtain the barite powder.
In the invention, the barite coarse powder is from barite raw ore, and the barium sulfate content of the barite raw ore is preferably more than or equal to 95%, more preferably more than or equal to 96%, and even more preferably more than or equal to 97%; the barite raw ore is subjected to jaw crushing, cone crushing and screening in sequence to obtain barite particles, wherein the particle size of the barite particles is preferably 2-6 mm, more preferably 3-5 mm, and even more preferably 3.5-4.5 mm; and (3) conveying the barite particles into a Raymond mill for grinding to obtain barite coarse powder.
In the present invention, the D98 value of the barite coarse powder in step (1) is preferably 40 to 55 μm, more preferably 42 to 53 μm, still more preferably 44 to 50 μm.
In the present invention, the mass of the grinding aid in the grinding aid solution is preferably 0.06 to 0.12% of the mass of the barite coarse powder, more preferably 0.07 to 0.11%, and still more preferably 0.08 to 0.1%.
In the present invention, the solid content of the grinding aid solution in the step (1) is preferably 45 to 55%, more preferably 46 to 54%, still more preferably 48 to 52%.
In the present invention, the grinding aid comprises an alcohol, a titanate coupling agent, an emulsifier and a dispersant.
In the present invention, the alcohol is preferably ethylene glycol and/or glycerol; the titanate coupling agent is preferably one or more of isopropyl tri (diisooctyl pyrophosphoryloxy) titanate, isopropyl tri (ethylenediamine N-ethoxy) titanate and di (diisooctyl pyrophosphoryloxy) ethylene titanate; the emulsifier is preferably sodium dodecyl sulfonate; the dispersant is preferably sodium polyacrylate and/or sodium polycarboxylate.
In the invention, the mass ratio of the alcohol to the titanate coupling agent to the emulsifier to the dispersant is preferably 1:0.1 to 0.5:0.2 to 0.7:1.2 to 2, more preferably 1:0.2 to 0.4:0.3 to 0.6:1.4 to 1.8, more preferably 1:0.25 to 0.35:0.4 to 0.5:1.5 to 1.7.
In the present invention, the frequency of the grinding in the step (1) is preferably 15 to 20HZ, more preferably 16 to 19HZ, still more preferably 17 to 18HZ; the D98 value of the intermediate powder is preferably 18 to 28. Mu.m, more preferably 19 to 27. Mu.m, and still more preferably 22 to 24. Mu.m.
In the present invention, the D98 value of the barite coarse powder in the barite coarse powder solution in step (2) is preferably 40 to 55 μm, more preferably 42 to 53 μm, still more preferably 44 to 50 μm.
In the present invention, the solid content of the barite coarse powder solution is preferably 20 to 40%, more preferably 25 to 35%, and still more preferably 28 to 32%.
In the present invention, the coupling agent in step (2) is preferably one or more of aminopropyl trimethoxysilane, aminopropyl triethoxysilane and vinyltriethoxysilane.
In the present invention, the mass of the coupling agent is preferably 0.2 to 0.6%, more preferably 0.3 to 0.5%, still more preferably 0.35 to 0.45% of the mass of the coarse barite powder in step (2).
In the present invention, the rotational speed of the polishing in the step (2) is preferably 2000 to 3000rpm, more preferably 2200 to 2800rpm, and still more preferably 2400 to 2600rpm.
In the present invention, the content of the 2 μm component in the barium sulfate slurry is preferably not less than 90%, more preferably not less than 92%, still more preferably not less than 94% by grinding in the step (2).
In the present invention, the mass ratio of the intermediate powder in the step (3) to the barium sulfate in the barium sulfate slurry is preferably 1:0.2 to 0.6, more preferably 1:0.3 to 0.5, more preferably 1:0.35 to 0.45.
In the present invention, the coupling agent is preferably one or more of aminopropyl trimethoxysilane, aminopropyl triethoxysilane and vinyl triethoxysilane coupling agents.
In the invention, the coupling agent plays roles of dispersing and surface modification, and reduces the surface energy of the barite particles.
In the present invention, the mass of the coupling agent is preferably 0.3 to 1%, more preferably 0.4 to 0.9%, and even more preferably 0.5 to 0.8% of the sum of the mass of barium sulfate in the intermediate powder and the barium sulfate slurry.
In the present invention, the intermediate powder of step (1), the barium sulfate slurry of step (2), the coupling agent and water are mixed to obtain a mixed system, and the solid content of the mixture is preferably 30 to 40%, more preferably 32 to 38%, and even more preferably 34 to 36%.
In the present invention, the stirring speed of the mixing in the step (3) is preferably 100 to 300rpm, more preferably 150 to 250rpm, still more preferably 180 to 220rpm; the time is preferably 20 to 40 minutes, more preferably 25 to 35 minutes, and still more preferably 28 to 32 minutes.
In the invention, after the mixing in the step (3), the obtained slurry is sent into a spray dryer for spray drying and collection, and the barite powder is obtained.
The invention also provides the barite powder obtained by the preparation method.
In the present invention, the average particle diameter D50 of the barite powder is preferably 2.5 to 3.5. Mu.m, more preferably 2.6 to 3.4. Mu.m, still more preferably 2.8 to 3.2. Mu.m; the content of the 2 μm component is preferably 32 to 35%, more preferably 33 to 34%, still more preferably 33.4 to 33.6%; d98 is preferably 24 to 26. Mu.m, more preferably 24.2 to 25.8. Mu.m, still more preferably 24.4 to 25.2. Mu.m; the oil absorption value is preferably 9 to 10ml/100g, more preferably 9.2 to 9.8ml/100g, still more preferably 9.4 to 9.6ml/100g.
In the invention, the barite powder has particle groups with reasonable coarse and fine collocation, and the particle groups with particle size distribution ensure that particles are closely stacked, the stacking density is high, and the filling rate is high.
The invention also provides application of the barite powder in extinction of epoxy paint, sound box base, yoga mat and powder paint.
In the invention, the epoxy coating is obtained after mixing the barite powder and the epoxy resin, wherein the mass ratio of the barite powder to the epoxy resin is preferably 50-80: 90 to 110, more preferably 55 to 75:92 to 108, more preferably 60 to 70: 98-102; the viscosity of the epoxy coating is preferably not more than 30000 mpa.s, more preferably not more than 28000 mpa.s, and even more preferably not more than 25000 mpa.s.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The barite raw ore with the barium sulfate content of 96% is subjected to jaw crushing, cone crushing and screening in sequence to obtain 4mm barite particles, and then the barite particles are sent into a Raymond mill for grinding to obtain barite coarse powder (D98 value is 46 μm).
Preparing a grinding aid, namely mixing ethylene glycol and glycerin in any ratio to obtain alcohol, wherein the mass ratio of alcohol to isopropyl tri (diisooctyl pyrophosphoryloxy) titanate to sodium dodecyl sulfonate to sodium polyacrylate is 1:0.3:0.5:1.6, grinding aid mass is 0.08% of the barite coarse powder mass; grinding aid is prepared into grinding aid solution with solid content of 50% by using water, and the barite powder and the grinding agent solution are mixed in a vertical rolling mill with diameter of 1100mm and are ground at a frequency of 16HZ, so that intermediate powder with D98 value of 26 mu m is obtained.
Preparing a barite coarse powder solution with the solid content of 35% by using water, adding aminopropyl triethoxysilane with the mass of 0.3% of the barite coarse powder, and carrying out wet grinding at the rotating speed of 2500rpm to obtain barium sulfate slurry with the component content of 2 mu m of 93%.
The mass ratio of barium sulfate in the intermediate powder and the barium sulfate slurry is controlled to be 1:0.4, the mass of the aminopropyl triethoxysilane is 0.6 percent of the sum of the mass of the barium sulfate in the intermediate powder and the mass of the barium sulfate slurry, water is added after mixing to control the solid content of the mixed slurry to be 35 percent, then the mixed slurry is stirred at the speed of 250rpm for 30 minutes, and the slurry is sent into a spray dryer to be dried after the stirring is finished, so as to obtain the barite powder.
Example 2
The barite raw ore with the barium sulfate content of 95% is subjected to jaw crushing, cone crushing and screening in sequence to obtain 3mm barite particles, and then the barite particles are sent into a Raymond mill for grinding to obtain barite coarse powder (D98 value is 51 μm).
Preparing a grinding aid, namely mixing ethylene glycol and glycerin in any ratio to obtain alcohol, wherein the mass ratio of the alcohol to the isopropyl tri (ethylenediamine N-ethoxy) titanate to the sodium dodecyl sulfate to the sodium polyacrylate is 1:0.4:0.7:1.8, grinding aid is 0.1% of the weight of the coarse powder of the barite; grinding aid is prepared into grinding aid solution with solid content of 45% by using water, and the barite powder and the grinding agent solution are mixed in a vertical rolling mill with diameter of 1100mm and are ground at a frequency of 18HZ, so that intermediate powder with D98 value of 24 μm is obtained.
Preparing a barite coarse powder solution with 37% of solid content by using water, adding vinyltriethoxysilane with 0.5% of the weight of the barite coarse powder, and carrying out wet grinding at a rotation speed of 2300rpm to obtain barium sulfate slurry with a 2 μm component content of 95%.
The mass ratio of barium sulfate in the intermediate powder and the barium sulfate slurry is controlled to be 1:0.5, the mass of the aminopropyl triethoxysilane is 0.8 percent of the sum of the mass of the barium sulfate in the intermediate powder and the mass of the barium sulfate slurry, water is added after mixing to control the solid content of the mixed slurry to be 35 percent, then the mixed slurry is stirred at the speed of 200rpm for 40 minutes, and the slurry is sent into a spray dryer to be dried after the stirring is finished, so as to obtain the barite powder.
Example 3
The barite raw ore with the barium sulfate content of 98% is subjected to jaw crushing, cone crushing and screening in sequence to obtain 5mm barite particles, and then the barite particles are sent into a Raymond mill for grinding to obtain barite coarse powder (D98 value is 50 μm).
Preparing a grinding aid, wherein the mass ratio of glycerin to bis (diisooctyl pyrophosphoryloxy) ethylene titanate to sodium dodecyl sulfonate to sodium polycarboxylate is 1:0.4:0.5:1.6, grinding aid mass is 0.08% of the barite coarse powder mass; grinding aid is prepared into grinding aid solution with solid content of 53% by using water, and the barite powder and the grinding agent solution are mixed in a vertical rolling mill with diameter of 1100mm and are ground at a frequency of 20HZ, so that intermediate powder with D98 value of 20 mu m is obtained.
Preparing a barite coarse powder solution with 28% of solid content by using water, adding aminopropyl trimethoxysilane with 0.3% of the weight of the barite coarse powder, and carrying out wet grinding at a rotating speed of 2600rpm to obtain barium sulfate slurry with 93% of 2 mu m component content.
The mass ratio of barium sulfate in the intermediate powder and the barium sulfate slurry is controlled to be 1: and 0.2, the mass of the aminopropyl trimethoxy silane is 0.4 percent of the sum of the mass of the barium sulfate in the intermediate powder and the mass of the barium sulfate slurry, water is added after mixing to control the solid content of the mixed slurry to 40 percent, then the mixed slurry is stirred at the speed of 280rpm for 35 minutes, and the slurry is sent into a spray dryer for drying after the stirring is finished, so as to obtain the barite powder.
Example 4
The barite raw ore with the barium sulfate content of 95% is subjected to jaw crushing, cone crushing and screening in sequence to obtain 2mm barite particles, and then the barite particles are sent into a Raymond mill for grinding to obtain barite coarse powder (D98 value is 42 μm).
Preparing a grinding aid, wherein the mass ratio of glycol to isopropyl tri (diisooctyl pyrophosphoryl oxy) titanate to sodium dodecyl sulfonate to sodium polyacrylate is 1:0.3:0.7:1.4, grinding aid is 0.11% of the weight of the coarse powder of the barite; grinding aid is prepared into grinding aid solution with solid content of 46% by using water, and the barite powder and the grinding agent solution are mixed in a vertical rolling mill with diameter of 1100mm and are ground at a frequency of 17HZ, so that intermediate powder with D98 value of 26 mu m is obtained.
Preparing a barite coarse powder solution with the solid content of 36% by using water, adding aminopropyl triethoxysilane with the mass of 0.4% of the barite coarse powder, and carrying out wet grinding at the rotating speed of 2500rpm to obtain barium sulfate slurry with the component content of 94% of 2 mu m.
The mass ratio of barium sulfate in the intermediate powder and the barium sulfate slurry is controlled to be 1:0.5, the mass of the aminopropyl triethoxysilane is 0.7 percent of the sum of the mass of the barium sulfate in the intermediate powder and the mass of the barium sulfate slurry, water is added after mixing to control the solid content of the mixed slurry to be 35 percent, then the mixed slurry is stirred at the speed of 150rpm for 30 minutes, and the slurry is sent into a spray dryer to be dried after the stirring is finished, so as to obtain the barite powder.
The performance test is carried out on the barite powder prepared in the examples 1-4, and the indexes of average grain diameter D50, content of 2 mu m, coarse grain breakpoint D98, oil absorption value, tap density, and bisphenol A resin with weight stone powder and epoxy value of 0.5 are examined according to the proportion of 65 at 25 ℃:100 and 70: the viscosity values after 100 blends are reported in Table 1.
TABLE 1 Performance test results
As can be seen from the above examples, the present invention provides a method for preparing barite powder, which is characterized by special particle size distribution, large tap density, low surface energy, good dispersibility, high filling rate, low viscosity, etc., wherein D50: 3+/-0.5 mu m, 32-35% of 2 mu m content, D98: 25+/-1 mu m, oil absorption value of 9-10 ml/100g, and epoxy resin (bisphenol A type, epoxy value of 0.5) according to the mass ratio of 65:100 is less than 30000 mpa.s.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The preparation method of the barite powder is characterized by comprising the following steps:
(1) Grinding the barite coarse powder and the grinding aid solution to obtain intermediate powder;
(2) Grinding the barite coarse powder solution and the coupling agent to obtain barium sulfate slurry;
(3) And (3) mixing the intermediate powder in the step (1), the barium sulfate slurry in the step (2), the coupling agent and water to obtain the barite powder.
2. The process of claim 1 wherein the barite meal in step (1) has a D98 value of 40 to 55 μm;
the mass of the grinding aid in the grinding aid solution is 0.06-0.12% of the mass of the coarse powder of the barite.
3. The method of claim 1 or 2, wherein the grinding aid solution in step (1) has a solids content of 45 to 55%;
the grinding aid comprises alcohol, titanate coupling agent, emulsifying agent and dispersing agent;
the alcohol is ethylene glycol and/or glycerol; the titanate coupling agent is one or more of isopropyl tri (diisooctyl pyrophosphoryloxy) titanate, isopropyl tri (ethylenediamine N-ethoxy) titanate and di (diisooctyl pyrophosphoryloxy) ethylene titanate; the emulsifier is sodium dodecyl sulfonate; the dispersing agent is sodium polyacrylate and/or sodium polycarboxylate;
the mass ratio of the alcohol to the titanate coupling agent to the emulsifier to the dispersing agent is 1:0.1 to 0.5:0.2 to 0.7: 1.2-2.
4. The method according to claim 3, wherein the frequency of the grinding in the step (1) is 15 to 20HZ, and the D98 value of the intermediate powder is 18 to 28. Mu.m.
5. The process according to claim 1 or 4, wherein the D98 value of the barite coarse powder in the barite coarse powder solution in step (2) is 40 to 55 μm;
the solid content of the barite coarse powder solution is 20-40%.
6. The method according to claim 5, wherein the coupling agent in the step (2) is one or more of aminopropyl trimethoxysilane, aminopropyl triethoxysilane and vinyltriethoxysilane;
the mass of the coupling agent is 0.2 to 0.6 percent of the mass of the barite coarse powder in the step (2);
the rotational speed of the grinding in the step (2) is 2000-3000 rpm.
7. The method according to claim 1, wherein the mass ratio of the intermediate powder to the barium sulfate in the barium sulfate slurry in the step (3) is 1:0.2 to 0.6;
the coupling agent is one or more of aminopropyl trimethoxy silane, aminopropyl triethoxy silane and vinyl triethoxy silane;
the mass of the coupling agent is 0.3-1% of the sum of the mass of the intermediate powder and the mass of the barium sulfate in the barium sulfate slurry;
the solid content of the mixture is 30-40%.
8. The method according to claim 1 or 7, wherein the stirring speed of the mixing in the step (3) is 100 to 300rpm for 20 to 40 minutes.
9. The barite powder obtained by the production method according to any one of claims 1 to 8.
10. The use of the barite powder according to claim 9 in epoxy paint, speaker bases, yoga mats, powder paint matting.
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