A grinding process that reduces grinding energy consumption and reduces over-grinding

Abstract

The invention discloses a grinding process for reducing grinding energy consumption and reducing over-grinding. The crushed materials are pre-graded through a section of linear vibrating screen, and the materials on the screen are put into a high-pressure roller mill for rolling, and the high-pressure roller mill product is passed through two The first-stage linear vibrating screen is inspected and classified. The material under the first-stage linear vibrating screen is combined with the material on the second-stage linear vibrating screen and then fed into the first-stage ball mill. The first-stage ball mill discharges ore and the second-stage linear vibrating screen. After pre-checking and grading is completed, the grading overflow is sent to the high-frequency vibrating fine sieve for inspection and control grading, and the material on the high-frequency vibrating fine sieve and the sand settling of the cyclone are sent to the second-stage ball mill to form a closed loop. The present invention adds a high-pressure roller mill and a screening link to separate the qualified particle size in time, reduces the amount of ore grinding that enters the ball mill, and achieves the goals of reducing energy consumption of ore grinding and reducing over-grinding. And in the second-stage grinding and classification, the combination of cyclone group and high-frequency vibrating fine screen is used to ensure the rationality of the selected particle size.

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