Method for producing metallized iron powder through carrying out carbon cycle oxygen increasing and direct reduction on massive iron ores

Abstract

The invention relates to the technical field of metallurgy, and in particular relates to a method for producing metallized iron powder through carrying out carbon cycle oxygen increasing and direct reduction on massive iron ores. According to the method, preliminary smashing is carried out on high silicon refractory iron ores, wherein the particle size of the selected iron ores is 2-16mm, the content of fixed carbon in semi coke is greater than 70% by mass, the particle size of the semi coke is 3-8mm, limestone comprises powdery limestone and massive limestone, the particle size of the powdery limestone is 1-5mm, the particle size of the massive limestone is 8-16mm and the metallized iron powder is conveniently and smoothly produced through controlling the particle sizes of the reactants; in the meantime, the iron ores, the limestone and the semi coke are mixed in the weight ratio of 100:(10-20):(15-30) to ensure that the high silicon refractory iron ores can be reduced to produce the metallized iron powder. The method disclosed by the invention is suitable for the high silicon refractory iron ores and the metallized iron powder with the metallization ratio of greater than 90% and the iron grade of greater than 80% can be obtained through reaction, so that the high silicon refractory iron ores can be effectively utilized.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing metallized iron powder through direct reduction of massive iron ore with carbon circulation and oxygen enhancement. Background technique [0002] my country is rich in iron ore resources, but more than 96% of the iron ore is lean ore, and the average iron grade of lean ore is 32.6%, while most of the lean ore is high-silicon refractory iron ore, whose iron grade is 28-35% lower, and the silicon content 20-48% higher. With the rapid development of my country's iron and steel industry, the demand for iron ore is increasing year by year. After years of mining iron ore resources, there are very few rich ore resources available for use. Poverty, the principle of first easy and then difficult. Therefore, under the circumstances that the available iron ore resources in our country tend to be poor, fine, miscellaneous and the price has risen sharply, technical r...

AI Technical Summary

Problems solved by technology

It is difficult to effectively enrich iron minerals by using conventional strong magnetic separation process, magnetization roasting-weak magnetic separation, flotation and other conventional processes, especially as ultra-fine low-grade high-silicon iron ore resources, due to its embedded distribution of useful minerals The particle size is extremely fine, and the properties of the original minerals are complex. It is difficult to develop and utilize the magnetic separation method, and the grade of the obtained iron concentrate is also low.

Images