A kind of magnetite ultra-fine crushing-grading magnetic separation method

Abstract

The invention provides an ultrafine crushing-graded magnetic separation method of magnetite, wherein magnetite can be efficiently separated. The method provided by the invention is performed according to the follow mode: (1) ultrafine-crushing raw ores through a high pressure roller mill and performing further grading on the ultrafine-crushed raw ores which meet the granularity requirement; (2) separating a graded fine fraction part through low intensity magnetic separation and separating a gangue part to obtain tailings 2 while separating magnetite monomer and connection parts through a magnetic screen to obtain middlings 2 and qualified concentrate 2, firstly performing first-stage grinding on a graded coarse fraction part and then performing separation on the graded coarse fraction part through low intensity magnetic separation, separating the gangue part to obtain tailings 1 while separating the magnetite monomer and connection parts through the magnetic screen to obtain middlings 1 and qualified concentrate 1; and (3) returning the middings 1 and the middlings 2 again to first-stage grinding. According to the method provided by the invention, the yield of concentrate and tailings is high, the obtained middlings are relatively few in total quantity, and the middlings are treated without arranging a special device, so that the energy consumption can be reduced, the flow can be shortened, and the configuration can be simplified.

Description

technical field [0001] The invention relates to the field of mineral dressing, in particular to a magnetite mineral processing method. Background technique [0002] Iron ore is the most important basic raw material for the iron and steel industry. The iron ore industry in my country can be divided into eight categories: magnetite, mixed ore, and vanadium-titanium magnetite. Among the currently available iron ore reserves, magnetite reserves reach 64.56%. Magnetite is still the main object of iron ore beneficiation. [0003] In the ore sorting process, the reduction of energy consumption is the key factor for saving sorting costs. About 5% of all mineral processing energy consumption in the world is used for material crushing. In the concentrator, the energy consumption of ore grinding accounts for more than 80% of the entire crushing operation, and the realization of "more crushing and less grinding" in the concentrator has always been one of the focuses of domestic and fo...

AI Technical Summary

Problems solved by technology

This process can be used to sort a variety of ores. The disadvantage of sorting magnetite is that the first-stage sorting has not yet reached the requirements of qualified concentrate products, and the second-stage regrinding and re-selection are still required, resulting in high-pressure rollers The dissociated monomer particles in the crushed product of the mill are ball milled again, which increases energy consumption and deteriorates the indicators. The process needs further improvement

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