Magnetic-floating separation technology of micro-fine particle dissemination magnet-hematite mixed ore

Abstract

The invention relates to a magnetic-floating separation technology of micro-fine particle dissemination magnet-hematite mixed ore. The processes of wet-type semi-autogenous grinding, stage grinding, phase-flux weakening-strong magnetism, and strong magnetism concentrate reverse flotation are adopted, the anion reverse flotation operation adopts one-section flotation and roughing, one-section flotation and concentration and a three-section flotation and scavenging ratio closed circuit system to sort flux weakening concentrate and flotation concentrate and combine the flux weakening concentrate and flotation concentrate into the final concentrate, and the grade of the final concentrate is 65-65.5%, and the yield of the final concentrate is 35-40%; one-section strong tailings, two-section strong magnetism tailings and three-section scavenging operation tailings are combined into the final tailings, and the grade of the final tailings is 13-13.5%, and the yield of the final tailings is 60-65%. The magnetic-floating separation technology has the following advantages: the wet-type semi-autogenous grinding process is adopted, the moderate and fine crushing processes are reduced, the cost is decreased, stage grinding and stage separation are realized, magnetic ore is recycled in advance by adopting the single magnetic separation method, 30% of feeding capacity of the flotation operation is reduced, and the chemical dosage is decreased, and the effects of cost decreasing and benefit increasing are realized.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a magnetic-flotation separation process of fine-grained magnetic-red mixed ore. Background technique [0002] In recent years, the domestic separation of lean iron ore has successfully adopted "continuous grinding, weak magnetic-strong magnetic-negative reverse flotation", "stage grinding, weak magnetic-strong magnetic-anion reverse flotation", "stage Grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "continuous grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "three-stage grinding, stage weak The magnetic-intensity magnetic-reverse flotation process has been promoted and applied in Anshan Iron and Steel Co., Ltd. and other domestic processing plants. [0003] These processes adopt three-stage crushing and screening of the raw ore, and the -12mm product under the ...

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Problems solved by technology

[0007] In this process, the particle size of a mixed magnetic concentrate after regrinding reaches 85% to 90% of -325 mesh. A certain amount of magnetic ore in the product of this grinding particle size has been fully dissociated from the monomer, and the qualified grade magnetic ore can be obtained through magnetic separation. Concentrate, but the magnetite contained in the ore in the process has reached the monomer dissociation into the reverse flotation operation, which makes the consumption of chemicals in the flotation operation large, which increases the processing capacity of the flotation operation, and also Increased the dosage of flotation agents and beneficiation costs, resulting in some insufficiently mineralized fine-grained magnetic ore entering the tailings of flotation operations, resulting in high tailings grades and large metal loss.

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