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Production capacity of silicon carbide

wallpapers News 2021-03-31
Basic situation
There are more than 200 silicon carbide smelting enterprises in China with an annual production capacity of more than 2.2 million tons (including more than 1.2 million tons of green silicon carbide blocks and about 1 million tons of black silicon carbide blocks). The power of smelting transformers is mostly 6300~12500kVA, and the largest smelting transformer is 32000kVA. There are more than 300 processing sand making and micro-powder production enterprises, with an annual production capacity of more than 2 million tons. In 2012, China's silicon carbide capacity utilization rate was less than 45%. About one-third of smelting companies have production lines for processing sand-making powder. Silicon carbide processing and sand production enterprises are mainly distributed in Henan, Shandong, Jiangsu, Jilin, Heilongjiang, and other provinces.

 
China's silicon carbide smelting production process, technical equipment, and energy consumption per ton have reached the world's leading level. The quality level of black and green silicon carbide raw blocks is also world-class. The gap between China's silicon carbide and the world's advanced level is mainly concentrated in four aspects: one is that large-scale machinery and equipment are rarely used in the production process, many processes are completed by manpower, and the per capita output of silicon carbide is low; the second is in the deep processing of silicon carbide products. , The quality management of granular sand and micro powder products is not sophisticated enough, and the product quality is not stable enough; third, the performance indicators of some cutting-edge products have a certain gap compared with similar products in developed countries; fourth, carbon monoxide is directly emitted during the smelting process. Major foreign companies have basically achieved closed smelting, while almost all of China's silicon carbide smelting is open smelting, and all carbon monoxide is discharged directly. In 2012, Chinese companies developed closed smelting technology to achieve full recovery of carbon monoxide, but there is still a long way to go before the industry is popularized.
According to the data of the Silicon Carbide Expert Committee of the Abrasives Committee of the China Machine Tool Industry Association, as of the end of 2012, the global silicon carbide production capacity reached more than 2.6 million tons, and there were 13 countries with a production capacity of more than 10,000 tons, accounting for 98% of the global total production capacity. %. Among them, China's silicon carbide production capacity reached 2.2 million tons, accounting for 84% of the world's total production capacity.
 
Made in China
Changbai Mountains, Henan, Lingshou County of Shijiazhuang Hebei, Qinghai, Gansu, Ningxia, Xinjiang, Sichuan, Harbin, Hunan, Guizhou, Danjiangkou of Hubei and other places. China's silicon carbide smelting companies are mainly located in Gansu, Ningxia, Qinghai, Xinjiang, Sichuan, and other places, accounting for about 85% of the total production capacity.
 
Quality specification
①The technical conditions of abrasive grade silicon carbide are in accordance with GB/T2480—96. The chemical composition of each grade is given in Table 6-6-47 and Table 6-6-48.
②The abrasive particle size and its composition, and the determination method of abrasive particle size composition: according to GB/T2481.2-2009.
GB/T 9258.1-2000|Abrasives for Coated Abrasives Particle Size Analysis Part 1: Particle Size Composition;
GB/T 9258.2-2008|Abrasives for coated abrasives Particle size analysis Part 2: Determination of the particle size composition of coarse abrasive particles P12~P220;
GB/T 9258.3-2000|Abrasives for coated abrasives Particle size analysis Part 3: Determination of particle size composition of fine powder P240~P2500.

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