Single magnetic separation of lean magnetite - magnetic vibration machine separation process

Abstract

The invention relates to a lean magnetite single magnetic separation-magnetic vibration machine separation process. The process comprises the steps that after being subjected to separation of stage grinding, a first stage magnetic separator, a first stage dewatering tank and a second stage magnetic separator, 12-0 mm lean magnetite is fed in first stage fine sieve operation, and after concentrated by a dewatering permanent magnet machine, oversize products of the first stage fine sieve operation are fed in third stage ball grinder for regrinding. The process is characterized by further comprising the following steps that after regrinding by the third stage ball grinder, the content of the products with the particle size reaching -200 meshes is 90%, the products are fed into a three stage magnetic separator and a magnetic vibration machine for separation, the grade of final concentrate is 67.3%-67.8%, and the grade of final tailings is 11%-11.5%. According to the lean magnetite single magnetic separation-magnetic vibration machine separation process, second stage dewatering tank operation and second stage fine sieve operation are reduced, returning of middlings is avoided, regrinding quantity is reduced by 50%, thus the number of regrinding machines can be reduced by half, and the purposes of energy saving, consumption reducing, cost reducing and benefit increasing are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a single magnetic separation-magnetic vibration machine separation process for lean magnetite. Background technique [0002] Lean magnetite is usually sorted by the method of "stage grinding, single magnetic separation, and fine screen regrinding". The content of -200 mesh is 55~60%. After a stage of magnetic separation, some of the qualified coarse tailings are thrown away. The coarse concentrate of the first magnetic separation is ground by the second stage of closed-circuit grinding, and the particle size of the secondary classification overflow reaches -200 mesh. 85% to 90%, after being separated by the first-stage dehydration tank and the second-stage magnetic separator, the concentrate of the second-stage magnetic separator is fed into the first-stage fine sieve, and the products on the screen are concentrated by the dehydration permanent magnet machine and t...

AI Technical Summary

Problems solved by technology

If the re-grinding particle size does not meet the requirements, the circulation volume of the medium ore will gradually increase, forming a vicious circle and affecting the sorting index. At the same time, the process is complex, energy-consuming, and costly

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