Micro-fine grained magnetic-hematite mixed iron ore mineral processing method

Abstract

The invention discloses a micro-fine grained magnetic-hematite mixed iron ore mineral processing method. The micro-fine grained magnetic-hematite mixed iron ore is crushed for primary grinding, the primary grinding product is fed into primary medium magnetic separation-primary high magnetic separation operation, and the primary high magnetic separation tailings T1 are discarded as qualified tailings; the primary medium magnetic separation coarse concentrate and the primary high magnetic separation coarse concentrate are combined for regrinding, the regrinding product is fed into secondary medium magnetic separation-secondary high magnetic separation operation, and the secondary high magnetic separation tailings T2 are discarded as qualified tailings; and the secondary medium magnetic concentrate and secondary high magnetic concentrate are combined and fed into anion reverse flotation operation, and the primary reverse flotation roughing, primary reverse flotation fining and tertiary reverse flotation sweeping are used, and the reagent system is that the sodium hydroxide is used as pH adjuster, the corn starch is used as iron ore depressant, the lime is used as activator, and RA-915is used as a collector. The method has the advantages of low loss of micro-fine grained iron ore, high iron recovery rate, high iron grade and cleanness and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and is particularly suitable for the beneficiation of fine-grained magnetic-red mixed iron ore. Background technique [0002] With the rapid development of the iron and steel industry, the iron ore resources with good geological conditions, high resource grade and good sortability are almost exhausted, and the fine-grained refractory mixed iron ore resources with poor selectivity have become the focus of mineral processing technology research one. [0003] At present, the commonly used methods for processing fine-grained magnetite at home and abroad include a single weak magnetic separation process, a weak magnetic separation-reverse flotation process, a weak magnetic separation-fine screening-weak magnetic separation process or a weak magnetic separation-gravity separation process. On the basis of weak magnetic separation and tailings, the weak magnetic concentrate is further upg...

AI Technical Summary

Problems solved by technology

[0007] (1) The iron grade of strong magnetic separation tailings is relatively high, generally 11% to 12%, and the iron loss rate is >15%

[0008] (2) Flotation index of environmental water quality deterioration

Although mud-resistant chemicals have been developed, fine mud accumulates in the system, and the pH value of the entire ring water is as high as 10, which is not conducive to sludge settlement. It can only be concentrated by adding chemicals at various stages, and the residue of chemicals will obviously affect the concentrate grade and recovery. rate indicator

[0009] (3) The iron grade of flotation feeding ore is low, while the iron grade of flotation tailings is high

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