Raw material processing technology for smelting ferrosilicon in submerged arc furnace

Abstract

The invention relates to a raw material processing technology for smelting ferrosilicon in a submerged arc furnace, which belongs to the technical field of ferroalloy production, raw materials mainly comprise silica containing 93-99% of silicon dioxide, blue carbon containing 80-84% of fixed carbon and iron oxide scale containing more than 70% of ferric oxide, the raw materials are respectively ground into flour with the particle size of not more than 0.063mm and mixed with silicon micro-powder containing more than 70% of silicon dioxide according to the following weight percentage: the silica powder accounts for 45-55%, the blue carbon powder accounts for 25-35%, the iron oxide scale powder accounts for 10-20% and the silicon micro-powder accounts for 3-5%, the mixture is weighed, then stirred and pressed into a blank, the forming pressure of the blank is 1.2-2.0Mp / cm2, the size can be decided according to the furnace type, the blank needs to be dried before entering into the furnace, the water content is less than 3%, and the use of the raw material processing technology can save the electricity for smelting by 20-30%, and save the blue carbon by 15%-25%. The raw material processing technology has the characteristics of simple technology, significantly shortened smelting time, high efficiency, small pollution, significant energy-saving effect and good economic benefits and social benefits.

Description

[0001] 1. Technical field: The present invention relates to the technical field of ferroalloy production, in particular to the technical field of pretreatment of ferrosilicon alloy production raw materials. 2. Background technology: [0002] Ferrosilicon is widely used in metal smelting. It is one of the important deoxidizers in the steelmaking process, one of the important reducing agents in the light metal smelting industry, and an indispensable and important raw material in the metallurgical industry. Because it is a high-energy-consuming product, most of the world's ferrosilicon production is carried out in developing countries and underdeveloped regions, and sufficient supply of electricity, coal and mineral resources must be guaranteed. [0003] At present, the raw materials for ferrosilicon production are mainly silica, semi-coke and iron oxide scale, which are put into the furnace in block form during smelting. Among them, the raw material silica requires a silicon diox...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 200910022809 discloses a method for producing ferrosilicon alloys with silica powder, coke powder and iron oxide sheet briquettes, but has the following disadvantages: 1. No metallurgical coke powder is currently used by a smelting enterprise because of poor electrical conductivity. High ash content, not suitable as raw material for ferrosilicon; 2. Waste silica powder cannot guarantee the content of silicon dioxide; 3. According to the disclosed particle size of the raw material, it is difficult to press and form

Images