Poor hematite high pressure roller milling, thickness grading and reselection-magnetic separation-centrifugal machine sorting process

Abstract

The invention relates to a poor hematite high pressure roller milling, thickness grading and reselection-magnetic separation-centrifugal machine sorting process. The process is characterized in that raw ore passes through coarse breaking, medium breaking screening, high pressure roller milling and air classification systems to be fed into a thickness grading hydrocyclones to be subject to classification operation, reselection, magnetic separation and centrifugal machine sorting are then carried out, and concentrates with the grade ranging from 67.5% to 67.8% and the yield ranging from 31.33% to 32% and tailings with the grade ranging from 10.5% to 11.5% and the yield ranging from 67.5% to 68.5% are sorted. According to the technological process, fine breaking operation in original three-stage breaking and first-stage ore grinding operation are omitted, a product with the granularity being 200 meshes and the content ranging from 60%-65% can be obtained directly through high pressure roller milling and thickness grading, the flowage structure is simplified, short process sorting is achieved, the ore separation 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, coarse and fine grading, gravity-magnetic-centrifuge separation processes of lean hematite. Background technique [0002] Lean hematite is usually sorted by the process of "three-stage crushing, stage grinding, coarse and fine classification, middle ore regrinding, gravity separation-magnetic separation-anion reverse flotation". That is, lean hematite ore 300-0mm, after rough 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. , the primary classification overflow particle size reaches -200 mesh and the content is 55-60%. The spiral chute is selected for separation, and the concentrate of the selected spiral chute is the gravity separation concentrate; the tailings of the roughing spiral chute are fed into a section of weak magnetic sweep ...

AI Technical Summary

Problems solved by technology

[0003] After coarse crushing, medium crushing and fine crushing and screening, the raw ore has a particle size of over -12mm90%, and then adopts the process of "stage grinding, coarse and fine classification, medium ore regrinding, gravity separation-magnetic separation-anion reverse flotation" In addition, three-stage crushing and one-stage grinding operations are used in the process, which has the disadvantages of many crushing and grinding stages, a long process, and complicated processes, resulting in high beneficiation costs

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