Dry grinding and dry concentration method for magnetic minerals

Abstract

The invention discloses a dry grinding and dry concentration method for magnetic minerals. The method comprises the following steps: crushing and enriching ore, conveying the obtained iron ore into a grinding head elevator, elevating to a grinding head bin, and delivering the iron ore into a coarse grinding bin of a dry-process central discharge ball mill for coarse grinding; elevating iron ore powder obtained through coarse grinding into a rotary powder concentrator by using a circulating elevator, and grading the iron ore powder; and conveying fine powder obtained in the rotary powder concentrator into a combined pneumatic magnetic separator, finely sorting, discharging the obtained concentration powder through a discharge hole of the combined pneumatic magnetic separator and conveying the obtained concentration powder to a finished product warehouse for storage, and collecting rest tailings by using a dust remover and conveying the tailings to a tailing site. The dry grinding and dry concentration method can overcome defects of low product quality, high production cost, low sorting efficiency, narrow application range and the like in the prior art to have the advantages of high product quality, low production cost, high sorting efficiency and wide application range.

Description

technical field [0001] The invention relates to the technical field of magnetic material sorting equipment, in particular to a method for dry grinding and dry sorting of magnetic minerals. Background technique [0002] At present, most of the magnetic mineral beneficiation methods in our country are wet beneficiation methods, that is, a large amount of water must be added during the grinding process to complete the beneficiation process. This mineral processing method requires high water resources in the mining area, and consumes a large amount of water in the mineral processing process, resulting in waste of water resources; moreover, the mineral processing process is relatively complicated, with large investment and many equipment used, resulting in high production costs. In addition, the tailings treatment of wet beneficiation requires special construction of tailings dams to store tailings. For the central and western regions where water resources are relatively poor, m...

AI Technical Summary

Problems solved by technology

For the central and western regions where water resources are relatively poor, many mineral resources cannot be developed and utilized due to the limitation of water resources

[0003] In addition, there is not yet a mature dry beneficiation process in China, and the existing dry beneficiation is difficult to solve the problems of over-grinding and insufficient dissociation during dry grinding; Due to the limitation of the sorting method, the contact time between the material and the magnetic drum is short, resulting in insufficient sorting, resulting in a large number of tailings, and the recovery rate will be greatly reduced

Since the material distribution method is solid material, that is, the material is evenly distributed to the magnetic separator through the material distribution device (that is, the traditional dustpan). The material needs to be continuous and uniform and the material layer is thin, which is difficult to achieve in actual industrial production, so it will directly affect the magnetic separator. production capacity

In the process of dry separation, it is easy to produce a large amount of entanglement, and it is difficult to improve the beneficiation grade

[0004] In the process of realizing the present invention, the inventor found that there are at least defects in the prior art such as low product quality, high production cost, low sorting efficiency, and small scope of application.

Images