Silicon carbide powder production process

Silicon carbide powder production process, characterized by the following steps:
(A) take the silicon carbide raw material, crushing machine, crushing and sieving to not more than 5mm of silicon carbide particles, and then shaping machine shaping them to no more than 2mm of silicon carbide particles, and the particles of which accounted for 80 Oval % or more, and then its acid cleaning, drying;
(2) above the dry mill with silicon carbide particles smash into d50 = 9.5-11.5μm silicon carbide powder, crushed when the mill is set to host the current 65-75A, fan flow is set to 40 - 50m3/min, analysis machine speed of 400 - 600 rpm / min;
(3) and then use the vortex air classifier silicon carbide powder grading, grading, vortex flow fan air classifier is 25-43m3/min, classifier wheel rotational speed of 2600 - 3300 rev / min, from grading mouth ceded ds94 = 6.5-5.5μm particle size of the finished product A, cyclone separation ds94 ≤ 5.5μm mouth semi-finished products;
(4) The cyclone vortex air classifier mouth separated by semi-impeller type air classifier and then a second grading, grading, impeller fan air classifier flow 25-10m3/min, classifier wheel rotational speed of 1300 - 1700 rev / min, separated from the particle size classification mouth ds94 = 4.5-3.0μm finished product B, then the separated product cyclone mouth.