Dry presorting and tailings discarding process for ultra-poor magnetite

Abstract

The invention relates to a dry presorting and tailings discarding process for ultra-poor magnetite, belonging to the technical field of magnetite presorting. The process comprises the following steps of: performing fine crushing on coarsely and intermediately crushed products with particle size not less than 70 mm through a closed loop to reach the particle size of 10-15 mm, performing dry weak magnetic rough sorting through a magnetic sorting machine with the magnetic field intensity of 1800-2000 Oe, and discarding a great amount of tailings with large particle size in advance; performing ultrafine crushing through a closed-loop high-pressure roller mill to reach the particle size of 3-5 mm, performing dry weak magnetic fine sorting through a magnetic sorting machine with the magnetic field intensity of 1600-1800 Oe, and discarding a great amount of tailings; and finally obtaining presorted concentrate. The discarding of a great amount of ultra-poor magnetite is realized, the grade of magnetite fed into a grinder is increased, the grinding cost is reduced, and the loss rate of magnetite is reduced. The process provided by the invention is easy to implement in the production in actual sorting plants and has high production efficiency, good product quality, energy saving, consumption reduction, low sorting cost and obvious economical benefit.

Description

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AI Technical Summary

Benefits of technology

The technology described in this patented relates to reducing iron oxide (Fe2 O3) levels in ultrapure rare earths (UFUs). By separating finely ground materials from larger ones beforehand, it becomes easier to handle them during further steps like upgrading or reclaiming UFOCs that have lower Fe2O3. Ultrafines made through two stages of wet/weakly magnesistive sorting result in improved recovery rates compared to previous methods such as open circuit breakage followed by final concentration. Additionally, there may exist other techniques involved in these treatments, including advanced strong magnectic fields, microwave heat treatment, and ultrasonic wave cleaning. Overall, this innovative approach helps optimize use of resources while minimizing environmental impact associated with traditional ways of extracting valuable meteorites.

Problems solved by technology

This patents describes two main problem areas: (1) how to efficiently use available low quality magnetic materials (iron) from China without causing environmental pollution; (2) reducing resource usage by developing new sources of this valuable metal while minimizing impact on our own healthy planetary systems.

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