Method for producing fine powder of magnetite from active iron ore

Abstract

This invention discloses a method for manufacturing magnetite concentrate from active iron ore. The method comprised: (1) pulverizing active iron ore, mixing with separation-deoxygenation promoter at a weight ratio of 1: (0.001-0.005), and placing the mixture in an earth kiln or suspended kiln; (2) uniformly heating to 550-850 deg.C to calcine the active iron ore, taking out milling in a ball mill to obtain iron ore slurry; (3) performing magnetic separation by a magnetic separator, precipitating, filtering and drying to obtain magnetite separator, precipitating, filtering and drying to obtain magnetite concentrate. The method has such advantages as low cost and simple process, and can obviously reduce the contents of harmful substances such as S, P, Zn, Na, Cu, Si, crystalline water, Hg and Mg, and increase iron content to higher than 62%. The obtained magnetite concentrate can satisfy corresponding state standards, and can be used to manufacture high-quality steel.

Description

(1) Technical field [0001] The invention relates to a method for preparing iron ore powder, in particular to a method for magnetite fine powder. (two), background technology [0002] As we all know, magnetite can produce high-quality steel products. However, the resources of magnetite are very short at present, and it is far from meeting the needs of steelmaking plants. Mines are of great economic importance. The existing method of producing magnetite from live iron ore is: select raw ore containing sulfur and low phosphorus, then crush the raw ore into ore sand, and then evenly stir the ore sand and magnetite fine powder in a weight ratio of 1:1 At the same time, after forming into balls, machine burning is carried out, and the finished product is finished after machine burning. This method has following deficiencies: because live iron ore contains harmful substances such as sulfur, phosphorus, zinc, sodium, copper, gold, silicon, crystal water, mercury, magnesium at leas...

AI Technical Summary

Problems solved by technology

This method has following deficiencies: because live iron ore contains harmful substances such as sulfur, phosphorus, zinc, sodium, copper, gold, silicon, crystal water, mercury, magnesium at least, existing method can not remove these substances effectively, As a result, the magnetite produced cannot meet the standards promulgated by the state at all, for example: the iron content is less than 62%, the sulfur content is greater than 0.5%, and the phosphorus content is greater than 0.3%, etc.

Using magnetite produced by existing methods to make steel, the steel produced not only has high production costs, but also can only be used as ordinary construction steel due to too many impurities, and cannot produce high-quality steel at all