Method for using gas fat coal as carbonaceous reducing agent

Abstract

The invention relates to a method for using gas fat coal as a carbonaceous reducing agent in silicon industry. According to the method, gas fat coal, silica powder and a binder are used as raw materials, and the mixture is molded and dried through a hot press molding process to prepare the carbonaceous reducing agent product with characteristics of low ash, high carbon, good chemical activity, high specific resistance and high mechanical strength. According to the present invention, the high-temperature dry distillation carbonization and sintering process is not required, and the dried agglomerate particles can be directly used as the carbonaceous reducing agent for furnace smelting, and can replace carbonaceous materials such as petroleum coke, charcoal, semi coke and the like, wherein the gas generated in the smelting process is used for producing coal gas through the recovery device, and the agglomerate particles after the pyrolysis and dry distillation have the technical indexes superior to the traditional carbonaceous reducing agent standard, and have characteristics of good gas permeability, high porosity, low production cost, low power consumption, improved product quality,resource recycling and the like.

Description

technical field [0001] The invention belongs to the technical field of silicon industry smelting, and in particular relates to a method for using gas-fertilized coal as a carbonaceous reducing agent in the silicon industry. Background technique [0002] At present, most of the carbonaceous reducing agents used in the smelting of my country's silicon industry are traditional mixed carbonaceous reducing agents composed of charcoal, petroleum coke, wood blocks, and semi-coke according to a certain ratio. With the expansion of my country's industrial silicon products in domestic and foreign markets, the supply shortage and price rise of the main original carbonaceous reducing agent materials used in silicon industry production have been caused. Among them, the supply of charcoal and petroleum coke is very tight, and the price has risen sharply. Unstable quality undoubtedly makes industrial silicon production face great difficulties. Although the use of petroleum coke can be used...

AI Technical Summary

Problems solved by technology

With the expansion of my country's industrial silicon products in domestic and foreign markets, the supply shortage and price rise of the main original carbonaceous reducing agent materials used in silicon industry production have been caused. Among them, the supply of charcoal and petroleum coke is very tight, and the price has risen sharply. The quality is unstable, which undoubtedly makes industrial silicon production face great difficulties

Although the use of petroleum coke can be used as a carbonaceous reducing agent, due to the high degree of graphitization with the increase of the calcination temperature, the electrical conductivity increases, and the specific resistance drops sharply; moreover, the crusting on the furnace surface seriously affects the gas permeability of the furnace charge, irritating The fire is serious and the furnace condition is difficult to control

Although charcoal is the most ideal carbonaceous reducing agent for industrial silicon production, a large number of trees need to be cut down to burn charcoal, which destroys the ecological environment