Ore grinding process for lowering energy consumption of ore grinding and reducing over-crushing

Abstract

The invention discloses an ore grinding process for lowering energy consumption of ore grinding and reducing over-crushing. The ore grinding process comprises the steps that firstly, crushed materialsare classified in advance through a first-stage linear vibrating screen, oversize materials enter a high-pressure roller mill to be milled, high-pressure roller milled products are inspected and graded through a second-stage linear vibrating screen, undersize materials of the first-stage linear vibrating screen and oversize materials of the second-stage linear vibrating screen are merged and thenfed into a first-stage ball mill, first-stage ball mill discharged ore and undersize materials of the second-stage linear vibrating screen jointly enter a hydrocyclone set to be subjected to in-advance inspection and classification, classified overflow is fed into a high-frequency vibrating fine screen to be inspected, controlled and classified, oversize materials of the high-frequency vibratingfine screen and hydrocyclone settled sand are fed into a second-stage ball mill to form a closed loop. According to the ore grinding process, the high-pressure roller mill and the sieving link is additionally arranged, the qualified particle grade is separated in time, the ore grinding amount entering the ball mill is decreased, and the purposes of lowering the energy consumption of ore grinding and reducing over-crushing are achieved; and the mode of combination of the hydrocyclone set and the high-frequency vibrating fine screen is adopted in second-stage ore grinding classification, and therationality of the feed particle size is ensured.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a grinding process for reducing energy consumption of grinding and reducing over-grinding. Background technique [0002] Grinding is the particle size preparation operation before sorting after ore crushing. The purpose of ore grinding is to dissociate useful minerals and gangue minerals to the maximum and provide a particle size that meets the requirements of the beneficiation process. Large-scale concentrators are usually the ores that will enter the concentrator All feed into the mill after 2-3 stages of grinding and grading operations to meet the beneficiation particle size requirements, the grinding volume is large, the number of grinding stages is large, the grinding energy consumption accounts for more than 70% of the total energy consumption of the beneficiation plant, and the grinding cost ranks first Not high enough. In addition, because the grad...

AI Technical Summary

Problems solved by technology

In addition, since the grading equipment matched with the mill is mainly a spiral classifier and a cyclone, the difference in specific gravity plays a leading role in the grading process, and some heavy minerals that have been dissociated from the monomer are easy to return to regrind and appear over-crushed, which affects Subsequent selection indicators