A method for preparing ultra-pure iron concentrate by deep processing of commercial grade magnetite concentrate

Abstract

The invention discloses a method for preparing ultra-pure iron ore concentrate through deep processing of commercial-grade magnetite concentrate, which adopts one-stage grinding-grading-one-stage weak magnetic separation, one-stage weak magnetic separation concentrate dehydration, and two-stage grinding- Classification, second-stage weak magnetic separation roughing-demagnetization-second-stage weak magnetic separation and concentration, second-stage weak magnetic separation concentrate demagnetization-concentration operation: demagnetize the second-stage weak magnetic separation concentrate , and then concentrated and reverse flotation operations, and finally obtained the grade of TFe in the ultra-pure iron concentrate 72.10% ~ 72.19%, SiO 2 Content 0.18% ~ 0.20%, acid insoluble matter 0.15% ~ 0.17%. At the same time, high-purity iron concentrates with a TFe grade of 70.86% to 71.12% can also be obtained. The collector for the reverse flotation operation of the present invention is a solution of dodecylamine and glacial acetic acid which is modified by heating according to the mass ratio of 4:1. The method of the invention has strong applicability, high efficiency and energy saving. The flotation reagent system is simple, the source is wide, the dosage is small, the selectivity is good, and it is very friendly to the environment and other excellent properties.

Description

technical field [0001] The invention belongs to the technical field of magnetite beneficiation, and in particular relates to a method for preparing ultra-pure iron concentrate from high-quality commercial grade magnetite. Background technique [0002] With the continuous development of the national economy, the demand for permanent magnet materials, reduced iron and other products is increasing day by day, and the quality requirements for the products are also getting higher and higher. At present, the raw materials for producing permanent magnet materials (ferrite) and reduced iron powder are mainly iron oxide red and iron scale. Since the output of iron oxide red and iron scale is small, the price is high, and the quality is not stable, so new methods are sought. Cheap raw material substitutes have become an important research topic to be solved urgently. [0003] Due to its fine particle size, high quality and wide source, ultra-pure iron concentrate has become the raw m...

AI Technical Summary

Problems solved by technology

But generally speaking, the concentrate iron grade in the ultra-pure iron concentrate prepared by the above method is still not ideal, especially the SiO 2 content, acid insoluble content is still high

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