A kind of iron ore circular classification beneficiation method and dry separation machine applied to the method

Abstract

An iron ore circulating classification beneficiation method includes the steps that (1), raw ore with the grain size ranging from 0 mm to 50 mm is conveyed into a high-pressure roller mill to be subjected to roller pressing, after the roller pressing index reaches the standard, a roller-pressed product is conveyed to a dry magnetic separator to be subjected to dry type separation, and three products including concentrates, middlings and tailings are obtained through separation; (2) the above middlings are returned to a feeding bin of the high-pressure roller mill and form a mixed material together with new raw ore, roller pressing continues, the step (1) is repeatedly executed, and a closed loop is formed; and (3) the separation concentrates obtained in the step (1) and in the step (2) are conveyed to a concentrate storage yard through a material bearing belt, the tailings obtained in the step (1) and in the step (2) are conveyed to a tailing storage yard through a material bearing belt, and beneficiation is completed. The concentrates obtained through separation are high in grade, the tailings obtained through separation are low in grade, the recovery rate is high, and cost is greatly saved.

Description

technical field [0001] The invention relates to the field of mineral processing, in particular to an iron ore circular classification mineral processing method and a dry separation machine applied to the method. Background technique [0002] At present, the latest magnetite crushing and dry separation system at home and abroad is to add a high-pressure roller mill for ultra-fine crushing after the original two-stage closed-circuit crushing or three-stage closed-circuit crushing. The high-pressure roller mill and the screening classification or wind classification system constitute closed-circuit crushing. The products rolled by the high-pressure roller mill enter the screening classification or wind classification system for particle size classification, and are divided into two types of products: coarse grain and fine grain. Coarse-grained materials are returned to the high-pressure roller mill for crushing again, and fine-grained products are separated by one or more stage...

AI Technical Summary

Problems solved by technology

The finer the particle size of the crushed product, the higher the dissociation degree of the material, and the better the sorting effect, but the product crushed by the high-pressure roller mill at one time has a certain particle size content. The more the coarse-grained content of the high-pressure roller mill is, the cycle load of the high-pressure roller mill (that is, the ratio of the amount of coarse-grained grades returned to the high-pressure roller mill obtained by classification to the new ore feeding amount of the high-pressure roller mill) also increases, and the processing capacity of the system needs to be configured. and energy consumption are greatly improved

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