Beneficiation method for micro-fine iron ore

Abstract

The invention relates to a beneficiation method for micro-fine iron ore. The beneficiation method for the micro-fine iron ore comprises the steps of ore grinding, classification with a hydrocyclone, pre-separation through low-intensity magnetic separation and high-intensity magnetic separation, and hybrid-magnetic-separated iron ore concentrate obtaining. The beneficiation method for the micro-fine iron ore is characterized by further comprising the steps that (1) mixing depression is conducted, wherein the magnetic-separated iron ore concentrate is placed into a stirring groove, a regulator, an activating agent and a dispersing agent are added into the stirring groove, and then mixing depression is conducted; (2) magnetic carrier-pre-magnetization is conducted, wherein a magnetic carrier with the weight being 10%-30% that of fed ore to be separated in a magnetic mode is added into the ore pulp, and then pre-magnetization is conducted through a pre-magnetizing machine; (3) coagulation and reverse flotation are conducted, wherein after an inhibitor and a collecting agent are added into the pre-magnetized ore pulp, reverse flotation which comprises the step of conducting rough concentration once, conducting fine concentration once and conducting scavenging concentration three times is conducted, tailings obtained after scavenging concentration is conducted for the last time serve as final tailings, and concentrate obtained through fine concentration serves as final concentrate. The beneficiation method for the micro-fine iron ore has the advantages that the yield of the finally obtained iron ore concentrate can be increased by 1.5% -3%, the recovery rate of iron can be increased by 5%-10%, energy can be saved greatly, consumption can be reduced greatly, and the grading index can be increased greatly.

Description

technical field [0001] The invention relates to an iron ore beneficiation method, in particular to a fine grain iron ore beneficiation method. Background technique [0002] The main feature of my country's iron ore resources is that the particle size of the embedded distribution is fine. The particle size of the iron minerals in the ore is 39.42 μm, and the particle size of the gangue minerals is 56.20 μm; "fine" means that the grinding cost is high and the recovery rate is low; It is easy to muddy during the fine grinding process, the ore particles have serious mud coverage, the recovery rate is low, and the specific surface area is large, the consumption of flotation reagents is large, the specific surface energy is high, the flotation foam is stable, and defoaming is difficult, and the production is difficult to go smoothly , the traditional flotation process is difficult to achieve satisfactory results when dealing with this type of ore, and there is an urgent need for an ...

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at the special ore properties of fine-grained complex refractory iron ore and the practical problems in beneficiation, and proposes a fine-grained iron ore beneficiation method , using strong magnetic iron minerals such as magnetite and pseudohematite as "magnetic carriers", exerting the magnetic force of "magnetic seeds" and the chemical flocculation and coagulation effect of flotation agents, cleverly using the surface of "magnetic carriers" to load and recover fine A complete set of process and technology of granular iron minerals

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