High-pressure roller grinding, weak magnet-strong magnet-reverse flotation technology for poor hematite

Abstract

The invention relates to a high-pressure roller grinding, weak magnet-strong magnet-reverse flotation technology for poor hematite. The technology includes the step that the poor hematite is subjected to rough crushing and medium crushing and is characterized by further including the following steps that after raw ore with the particle size being 300-0mm is subjected to rough crushing and medium crushing screening operations, the product particle size is 35-0mm; by the adoption of a high-pressure roller grinding device and an air classification system, coarse-grained products suffering from air classification return to the high-pressure roller grinding device, and fine-grained products with the air classification particle size being -200 meshes and the content being 90%-95% are fed into the weak magnet-strong magnet-anion reverse flotation technology. By the adoption of the technology, an original fine crushing operation and a two-section ore grinding operation are omitted in the technological process, the high-pressure roller grinding device and the air classification system are adopted so that the fine-grained products with the particle size being -200 meshes and the content being 90%-95% can be obtained directly, the flowage structure is simplified, short-process sorting is realized, beneficiation cost is greatly reduced, and economical benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to high-pressure roller milling, weak magnetic-strong magnetic-reverse flotation process of lean hematite. Background technique [0002] Lean hematite is usually sorted by "three-stage crushing, two-stage continuous grinding, weak magnetic-strong magnetic-anion reverse flotation" process. That is, lean hematite ore 300-0mm, after coarse crushing, medium crushing and fine crushing and screening, a product with a particle size of -12mm and a content of more than 90% is formed. After two stages of continuous grinding, (one stage grinding and Primary classification forms closed-circuit grinding, second-stage grinding and secondary classification form closed-circuit grinding), secondary classification overflow particle size reaches -200 mesh content 88-90%, and secondary classification overflow products are fed into the first-stage weak magnetic separator Separati...

AI Technical Summary

Problems solved by technology

[0003] After coarse crushing, medium crushing, and fine crushing and screening, the particle size of the raw ore reaches -12mm90% or more, and the process of "two-stage continuous grinding, weak magnetic-strong magnetic-anion reverse flotation" is adopted for separation, and three stages are used in the process Crushing and two-stage grinding operations have the disadvantages of large number of separation stages, long process, high mineral processing cost and complicated process

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