Quality-improving and silicon-reducing recleaning process for low-grade iron ore concentrate

Abstract

The invention discloses a quality-improving and silicon-reducing recleaning process for low-grade iron ore concentrate. The process comprises the following specific steps that the iron ore concentrate is ground into ore powder or ore pulp with-325 meshes accounting for 80-82%; performing low-intensity magnetic separation on the mineral powder or the ore pulp to obtain first-section low-intensity magnetic concentrate and first-section low-intensity magnetic tailings; the first-section weak magnetic tailings are subjected to bed grading to obtain table concentrate and table tailings; the table tailings are subjected to first-stage strong magnetic separation to obtain first-stage strong magnetic concentrate and first-stage strong magnetic tailings, and the first-stage strong magnetic concentrate is subjected to second-stage strong magnetic separation to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings. By the adoption of the process, low-grade concentrate of a concentration plant has selectability, the yield of pipeline concentrate can be further greatly increased, product structure optimization is achieved, the resource comprehensive utilization rate of complex refractory ore is further increased, and economic benefits are increased.

Description

technical field [0001] The invention belongs to the technical field of mineral engineering, and in particular relates to a process for improving the quality and reducing silicon of low-grade iron ore concentrate. Background technique [0002] The 37% grade concentrate produced by Yuxi Dahongshan Ore Concentrator is composed of hematite and a small part of magnetite, and the embedded particle size is relatively fine, the monomer dissociation degree is not high, and the TFe grade is generally 32 ~40%, silicon as high as 28%, low economic value, however, it is difficult to effectively separate gangue from high-grade ore by using conventional magnetic separation methods to improve quality and reduce silicon, the recovery rate of operation is low, and the efficiency of separation is low. It has not been ideal. However, if this part of the ore is incorporated into the total refinery, it will lead to a decrease in the level of the total refinement and an increase in the silicon co...

AI Technical Summary

Problems solved by technology

[0002] The 37% grade concentrate produced by Yuxi Dahongshan Ore Concentrator is composed of hematite and a small part of magnetite, and the embedded particle size is relatively fine, the monomer dissociation degree is not high, and the TFe grade is generally 32 ~40%, silicon as high as 28%, low economic value, however, it is difficult to effectively separate gangue from high-grade ore by using conventional magnetic separation methods to improve quality and reduce silicon, the recovery rate of operation is low, and the efficiency of separation is low. has been unsatisfactory

However, if this part of the ore is incorporated into the total refinery, it will lead to a decrease in the level of the total refinement and an increase in the silicon content, which will affect economic benefits.

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