Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process

Abstract

The invention relates to a micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is characterized by separating micro-fine disseminated mixed ores through an operating system with semi-autogenous grinding, wet preconcentration, continuous ore grinding, low-intensity and high-intensity magnetic separation, under-size sieve grinding and high-intensity magnetic fine gravitational separation to obtain 65.5-66% of iron ore concentrate at a yield rate of 35-40%. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process has the advantages that, by means of a wet semi-autogenous grinding process, crushing operations can be reduced; preconcentrated rough concentrate, after two sections of continuous grinding, can get rid of large-grain gangue and lean locked particles; then by performing separation through a low-intensity magnetic fine sieve regrinding method, qualified-grade concentrate can be obtained and meanwhile feeding capacity of gravitational separation operations can be reduced by 30%. Meanwhile, the micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is short in process, simple in equipment, easy to operate, free from environmental pollution and capable of saving energy.

Description

Technical field [0001] The present invention belongs to the field of iron ore mining technology, especially a fine -grained mixed -mine -mixed -mine preparatory and magnetic -retention process. Background technique [0002] In recent years, the selection of poor iron ore in China has successfully adopted "continuous grinding, weak magnetic-strong magnetic-yin anti-floating", "phase grinding, weak magnetic-strong magnetic-anion anti-floating", "stage stage", "stage stage"Mining, thickness classification, re -grinding of Chinese ore, heavy -magnetic -anti -floating "," continuous grinding, thickness classification, Chinese ore again, heavy -magnetic -anti -floating "," three -stage grinding, weak stage, weak stageThe magnetic strength -anti -floating "process is promoted and applied in Angang and other domestic selection factories. [0003] After these processes are used, the original ore is sieved after three sections of the original ore, and the -12 mm products are sieved into th...

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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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