Beneficiation method for high sulphur magnetite containing pyrrhotite and pyrite

Abstract

The invention discloses a beneficiation method for high sulphur magnetite containing pyrrhotite and pyrite. The method is used for beneficiation of the high sulphur magnetite with the grade of raw ore TFe being 56%-60% and the content of TS being 3.5%-4.2%. The method comprises the following technological steps that (1) the high sulphur magnetite is subjected to grinding and grading-low-intensity magnetic separation operation; (2) the pyrite is removed through primary flotation, specifically, butyl xanthate is used as a collecting agent for the pyrite, and 2#oil serves as a foaming agent; and (3) the pyrrhotite is removed through secondary flotation, specifically, primary roughing and primary scavenging are adopted, oxalic acid is used as a pH value regulator and an activating agent of the pyrrhotite, the butyl xanthate serves as a collecting agent of the pyrrhotite, and the 2#oil serves as the foaming agent. The beneficiation method has the advantages that the grade of iron ore concentrate TFe is high, the content of a harmful impurity S is low, production is stable, and safety and high efficiency are achieved, so that safety risks are reduced; and the oxalic acid (solid) is adopted to replace concentrated sulfuric acid to serve as the pH value regulator and the activating agent of the pyrrhotite, operation is simple and easy in the production process, and the safer and more reliable effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a beneficiation method for increasing iron and reducing sulfur in iron ore, especially suitable for raw ore with a TFe grade between 56% and 60% and a TS content between 3.5% and 4.2%. And beneficiation of high-sulfur magnetite ore that is associated with pyrrhotite and pyrite. Background technique [0002] The level of sulfur content is an important criterion to measure the quality of iron ore concentrate. Excessive sulfur content in iron concentrate will directly affect the quality of ironmaking and steelmaking, and will also endanger the production of blast furnaces, which will have a negative impact on ironmaking and steelmaking. At the same time, sulfur emissions will also cause environmental pollution. With the adjustment of my country's economic model and the continuous increase in environmental protection, the quality requirements for iron concentrates are...

AI Technical Summary

Problems solved by technology

[0005] Its shortcoming lies in: adding concentrated sulfuric acid to slurry during flotation desulfurization of magnetite concentrate and cleaning the surface of pyrrhotite that is difficult to float, so that it can float up after adding sulfide ore collector, so as to realize the reduction of sulfur in iron concentrate Purpose

However, this method still uses sulfuric acid as an adjustment agent, and there are still safety risks in industrial applications, and the sulfur content of the final iron concentrate is still relatively high

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