A silicon carbide powder production process, the steps are as follows:
(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.
Screening
Screening is to granules, particles of the powder into segments of different sizes. Single TS vibratory screening machine can be equipped with screens to 4 layers can elect 2-5 consecutive points and control the narrow grain size range.
Screen out impurities
Performance sieve machine at high flow process, can quickly remove a large percentage of a low pulp particles or small particles separated. TS vibration screening function of the different types of slurry in the rapid removal of insoluble solids and continuous slag.
Black silicon carbide is quartz sand, petroleum coke and quality silica as the main raw material in electric arc furnace smelting. Its hardness between corundum and diamond, the mechanical strength is higher than corundum, brittle and sharp. Black silicon carbide SiC containing approximately 98.5% higher than its toughness green silicon carbide, mostly for processing low tensile strength of the material, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
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