Carbon-based materials for in-situ synthesis of high-pure green 6H-SiC

Abstract

The invention discloses a carbon-based material for the in-situ synthesis of high purity environment-friendly 6H-SiC. The material is prepared by the following steps: (1) picking anthracite material containing fixed carbon of higher than 88% and ash of 4-4.5%, loading in the ball mill and ball-milling to granular material with the particle size of lower than 1mm; (2) grinding and grading the material obtained in step (1) in a jet mill to obtain 10-30 Mu carbon-based granular material containing ash of lower than 3.5%, fixed carbon of higher than 89% and volatile components of 4-6%. Anthracite carbon-based material ground, graded and purified by airflow is adopted so that the content of the fixed carbon is equivalent to that of petroleum coke and the content of volatile components is lower than that of the petroleum coke (8-10%). Since the average particle diameter of the obtained carbon-based material is more than100 times smaller than that of the petroleum coke, the reaction specific surface area is greatly increased, and the reaction capacity of the carbon-based material is improved so that the produced high purity environment-friendly 6H-SiC has improved product quality and yield compared with the conventional production method.

Description

technical field [0001] The invention relates to a carbon-based material for smelting green silicon carbide, in particular to a carbon-based material for in-situ synthesis of high-purity green 6H-SiC. Background technique [0002] At present, the carbon-based material used in traditional green silicon carbide smelting is No. 2 delayed petroleum coke, with a fixed carbon content of 88-90%, ash content <1%, and volatile content of 8-10%. Jaw crushers or rollers are used in production Grinding it into 1-0.3mm granules with a type crusher. Petroleum coke is a product of petroleum residue coking. With the increasing depletion of petroleum resources, high petroleum prices, and continuous petroleum deep processing to obtain high value-added petroleum products, less and less resources can be obtained. As a traditional The production of raw materials for green silicon carbide has severely restricted the future development of the industry, and due to the rising price of petroleum c...

AI Technical Summary

Problems solved by technology

Petroleum coke is a product of petroleum residue coking. With the depletion of petroleum resources, high petroleum prices, and continuous petroleum deep processing to obtain high value-added petroleum products, less and less resources can be obtained. As a traditional The production of raw materials for green silicon carbide has severely restricted the future development of the industry, and due to the rising price of petroleum coke, 1.5-1.7 tons of petroleum coke is required to smelt 1 ton of green silicon carbide. The current cost per ton is 5300-5900 yuan. The purity of the green silicon carbide produced is 98-98.5%, and the output rate is only about 60%.