Method for using long flame coal as carbonaceous reductant for silicon calcium alloy

Abstract

The invention discloses a method for using long flame coal as a carbonaceous reductant for a silicon calcium alloy. The method comprises the steps of according to the production requirement of the silicon calcium alloy, measuring silica, calcium carbide, the long flame coal and the like according to the proportion according to the ingredient requirements for silicon calcium alloy production, uniformly mixing, adding into a submerged arc furnace, carrying out dry distillation reaction on the long flame coal at the low and high temperature states, forming the carbonaceous reductant with high fixed carbon, high specific resistance, high chemical activity and low ash content, and recycling the dry-distilled coal gas through a recycling device; and sufficiently reacting the dry-distilled carbonaceous reductant and various elements at 1800 to 2200 DEG C so as to generate the silicon calcium alloy. The method has the characteristics that the source of the carbonaceous reductant is expanded, an application effect is good, the calcium volatilization and the heat energy loss are reduced, the product quality and the yield are improved, the coal gas recycling rate is high, the energy is saved,the emission is reduced, and the like.

Description

technical field [0001] The invention relates to the technical field of smelting calcium-silicon alloys, in particular to a method for using long-flame coal as a carbonaceous reducing agent for calcium-silicon alloys. Background technique [0002] Carbon reducing agent is one of the necessary raw materials in the production of silicon-calcium alloy, and its properties directly affect the quality of the product. At present, coke, petroleum coke, and charcoal are mostly used as carbonaceous reducing agents in the production of silicon-calcium alloys. The requirements are: high fixed carbon content, low ash content, high resistivity, and strong reactivity. Some alloy companies use lignite, petroleum, etc. Coke replaces coke and charcoal as a carbonaceous reducing agent, because lignite is easily pulverized at high temperature and affects the passage of gas; while petroleum coke is used alone as a carbonaceous reducing agent, the degree of graphitization increases with the increa...

AI Technical Summary

Problems solved by technology

At present, coke, petroleum coke, and charcoal are mostly used as carbonaceous reducing agents in the production of silicon-calcium alloys. The requirements are: high fixed carbon content, low ash content, high resistivity, and strong reactivity. Some alloy companies use lignite, petroleum, etc. Coke replaces coke and charcoal as a carbonaceous reducing agent, because lignite is easily pulverized at high temperature and affects the passage of gas; while petroleum coke is used alone as a carbonaceous reducing agent, the degree of graphitization increases with the increase of calcination temperature in smelting, and the conductivity Enhanced, resulting in a sharp drop in specific resistance, and serious crusting on the furnace surface of the reducing agent, affecting the gas permeability of the charge