Superfine processing and grain diameter control method of powder materials
A powder material and particle size control technology, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of inability to prepare submicron or nanoscale ultrafine powder, reduce material purity, and difficulty in controlling particle distribution, etc. problems, to achieve the effect of easy production process, simple preparation process equipment, and controllable particle size range
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Embodiment 1
[0029] Ultra-fine processing and particle size control technology of polyphosphate:
[0030] 1) Prepare a 50% alcohol solution with ethanol and water at a mass ratio of 1:1, then add a 0.2% dispersant in the alcohol solution, and disperse with a high-speed homogeneous emulsifier for 5 minutes;
[0031] 2) Add polyphosphate (2500 mesh) with 25% alcohol solution mass, adjust the pH of the dispersion to 3~4 with 10% phosphoric acid solution, and disperse for 15 minutes with a high-speed homogeneous emulsifier;
[0032] 3) A horizontal circulating sand mill is used as a wet mechanical grinding equipment. The inner wall of the grinding chamber is made of polyurethane, and the composite zirconia microbeads of 0.6~0.8mm are used as the grinding medium. The liquid flow rate is 0.5L / min, and the Grinding rate, circular grinding for 2 hours;
[0033] 4) After filtering the ground slurry with 800 sieves, dry it with a centrifugal atomization dryer;
[0034] 5) The obtained powder parti...
Embodiment 2
[0037] Ultra-fine processing and particle size control technology of aluminum hydroxide:
[0038] 1) Mix water and aluminum hydroxide (1250 mesh) at a mass ratio of 30% to make an aqueous dispersion, then add a dispersant with a mass of 0.5% of the dispersion, and disperse for 5 minutes with a high-speed homogeneous emulsifier;
[0039] 2) Use a horizontal circulating sand mill as a wet mechanical grinding equipment. The inner wall of the grinding chamber is made of polyurethane, with 0.8~1.0mm composite zirconia microbeads as the grinding medium, with a liquid flow rate of 0.5L / min and a speed of 2500rpm. Grinding rate, circular grinding for 3 hours;
[0040] 3) After filtering the ground slurry with 800 sieves, dry it with a centrifugal atomization dryer;
[0041] 4) The obtained powder particles are pulverized by a fluidized bed jet mill.
[0042] The average particle diameter of the ultrafine aluminum hydroxide prepared in this embodiment is 400~600nm, see figure 2 Par...
Embodiment 3
[0044] Ultrafine processing and particle size control technology of titanium dioxide:
[0045] 1) Prepare water and ethylene glycol at a mass ratio of 4:1 to make a 20% aqueous solution, then add 0.5% dispersant to the solution, and disperse for 5 minutes with a high-speed homogeneous emulsifier;
[0046] 2) Use 10% sodium hydroxide solution to adjust the pH of the dispersion to 9~10, then add titanium dioxide (400~500nm) with 30% solution mass, and disperse for 15 minutes with a high-speed homogeneous emulsifier;
[0047] 3) Use a vertical sand mill as a wet mechanical grinding equipment, the material of the inner wall of the grinding chamber is zirconia ceramics, use 0.1~0.2mm composite zirconia microbeads as the grinding medium, and grind at a grinding rate of 4000rpm for 5 hours;
[0048] 4) Filter the ground slurry with a 1000-mesh screen and dry it with a centrifugal atomization dryer;
[0049] 5) The obtained powder particles are pulverized by a fluidized bed jet mill....
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