Method for grading inside overflow of silicon carbide super micro powder
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A technology of ultra-fine powder and grading method, which is applied in the direction of chemical instruments and methods, solid separation, wet separation, etc., can solve the problems of long production time, uneven particle size distribution, etc. The effect of uniform particles and narrow particle size distribution
Active Publication Date: 2013-01-09
连云港市沃鑫高新材料有限公司 +1
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However, the traditional production method can only produce products of about 10 μm, and the particle size distribution is too large, the particles are uneven, and there are many impurities
However, the production time of sedimentation classification is too long and the production efficiency is too low. Although the efficiency of overflow production has been improved, the particle size distribution of the product is wide and the micropowder particles are uneven.
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[0018] A kind of inner overflow classification method of silicon carbide superfine powder,
[0019] The purified silicon carbide mixed slurry is put into a classification kettle, the mass percentage concentration of the mixed slurry is 20%-30%, and the particle size is between 1-15 μm. Use the internal overflow grading kettle with a diameter of Ф1400 and a height of 5000 to classify products with a size above 2000 mesh, and use the buoyancy of water to classify products of 2000 mesh and finer, 2000 mesh, 1500 mesh, 1200 mesh, and 1000 mesh;
[0020] Under the condition of constant pressure, adjust the flow rate of water from 0 to 500 kg / h, first classify the products with a size of 2000 mesh or more, and track and detect the particle size of the overflow liquid at any time. When the particle size of the product in the overflow liquid reaches 2000 mesh , transfer the overflow liquid to the 2000-mesh sedimentation tank, and gradually increase the water flow rate to 1000 kg / hour,...
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Abstract
The invention relates to a method for grading inside overflow of silicon carbide super micro powder. A purified silicon carbide mixed slurry is added into a grading kettle; a product with 2, 000 meshes is graded by using the inside overflow grading kettle with a diameter of 1,400 and a height of 5,000 into five specifications of the products, namely 2,000 meshes fine, 2,000 meshes, 1,500 meshes, 1,200 meshes and 1,000 meshes; and then the product with 2, 000 meshes fine is graded by using the inside overflow grading kettle with the diameter of 1,800 and the height of 5,000 into six specifications of the products, namely 8,000 meshes fine, 6,000 meshes, 4,000 meshes, 3,000 meshes, 2,500 meshes and 2,000 meshes. Water for overflow has the following water quality requirements: the water temperature is 20 DEG C; and the electric conductivity is less than 20. By adopting a production process of the inside overflow, the quality of the product is greatly improved, the variety and the number are increased, particle size distribution of the product is narrow, micro powder particles are even and the efficiency is high.
Description
technical field [0001] The invention relates to a production technology of silicon carbide, in particular to an inner overflow classification method of silicon carbide ultrafine powder. Background technique [0002] Silicon carbide has the characteristics of stable chemical properties, high thermal conductivity, low thermal expansion coefficient, high hardness, wear resistance and strong self-sharpness, and is widely used in processing cemented carbide and optical glass industries. In recent years, with the development of the world's semiconductor industry, silicon carbide has been widely used in multi-wire cutting and grinding of monocrystalline silicon, polycrystalline silicon, and piezoelectric quartz crystals, especially in the rapidly developing photovoltaic industry. Its quality is not only related to its purity, but also related to its particle fineness. The higher the purity, the finer the particle, the higher the application quality and the wider the application ran...
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