Magnetite beneficiation process capable of fully releasing mill capacity

Abstract

The invention relates to a magnetite beneficiation process capable of fully releasing mill capacity. The magnetite beneficiation process includes the steps that raw ore is subjected to three-section breaking and secondary dry separation and then ultrafine-ground through high-pressure roller milling, after high-pressure roller milling products are screened through screening equipment, undersize products are fed into a wet type preselection magnetic separator, wet type preselection rough concentrate is subjected to ore grinding, classifying, magnetic separating and reselecting, partially-qualified concentrate is obtained, reselecting process tailings are fed into second-section ore grinding after being subjected to concentration magnetic separation, second-section ore grinding products are subjected to magnetic separation, fine screening classification and elutriating selecting, and qualified concentrate is obtained. As the high-pressure roll milling products are subjected to wet type preselection, a large quantity of qualified tailings can be thrown out, the mill entering quantity is reduced, and the ore milling cost and the energy consumption are reduced; the partially-qualified concentrate can be recycled in advance through the magnetic and gravity combined separation process by means of the density difference between iron minerals and lean coenobium; and in the whole process,the mill capacity can be fully released, energy saving and consumption reduction are achieved, compared with current conventional processes, the effective volume of a ball mill can be reduced to be 50% or below, the investment can be greatly reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a magnetite mineral processing process that fully releases the capacity of a mill. Background technique [0002] In mineral processing production, ball milling is the most critical link in the entire mineral processing process. Grinding operations account for a large proportion of the capital investment and production costs of the mineral processing plant. The operation of the ball mill has a significant impact on the economic and technical indicators of the entire mineral processing plant. Therefore, it also has an important impact on the production capacity and economic benefits of the concentrator. Therefore, how to maximize the capacity of the ball mill is directly related to the technical indicators and economic benefits of the enterprise. [0003] At present, the magnetite process is mostly a three-stage closed-circuit crushing, stage grinding, and stage magneti...

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Problems solved by technology

[0003] At present, the magnetite process is mostly a three-stage closed-circuit crushing, stage grinding, and stage magnetic separation process. Although this process can obtain good technical indicators, it does not fully consider the release of the mill capacity. One is the dry magnetic separator. As pre-grinding pre-selection tailing equipment is widely used in the field of magnetite, but the tailing effect of large dry separation is far less than that of fine particles; second, it is difficult for a single magnetic separation process to treat iron with a wide particle size range. Minerals and poor intergrowth are well separated. At the same time, cyclones or fine screens are used as grading equipment, which will cause some qualified products on the screen or in the cyclone grit to return to the secondary mill for regrinding, which will further increase The burden on the mill, resulting in a reduction in the processing capacity of the entire process

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