A high-efficiency and low-energy consumption classification grinding method

Abstract

The invention belongs to the technical field of ore grinding, and particularly relates to an efficient low-energy-consumption grading ore grinding method. The efficient low-energy-consumption grading ore grinding method comprises high-pressure roller grinding breaking work, wet type grading work, grading ore grinding work and high-frequency undersize sieve slag isolation work; a high-pressure roller mill is adopted for breaking the ore before grinding, the granularity of in-grinding ore can be reduced, multi-breaking little-grinding can be achieved, a wet type linear vibration screen is adopted for grading the rolling material, grading of thin and thick ore can be achieved, thick and thin grain ore in size composition and different relative grinding degrees enters the different ore grinding grading flows, selective ore grinding is achieved, the two kinds of separated ore can enter different ore grinding grading flows, and flows of different ore grinding media and ore grinding concentrations, and distinguished ore grinding is achieved; a flat bottom type hydrocyclone is adopted in grading equipment, grading efficiency during rough grinding can be improved, high-frequency fine sieve oversize products enter the ore grinding flows, and stability and uniformity of two ore grinding processes an be ensured.

Description

technical field [0001] The invention belongs to the technical field of ore grinding, and in particular relates to a high-efficiency and low-energy-consumption graded grinding method. Background technique [0002] Grinding is an operation in mechanical equipment to further reduce the particle size of the ore until it is ground into powder by means of the impact and grinding action of the medium (steel ball, steel rod, gravel) and the ore itself. The purpose is to make the ore The useful minerals and gangue minerals can be dissociated to the maximum to provide materials that meet the requirements of the next beneficiation process in terms of particle size. After the grinding products are classified, the unqualified parts are returned to the original mill, which is called closed-circuit grinding; Returning to the original mill or being processed by another mill is called open-circuit grinding. Grinding is a very important operation in the beneficiation plant. The quality of the...

AI Technical Summary

Problems solved by technology

The existing -15mm powder ore directly enters the first-stage mill for grinding, and the discharge of the mill enters the first-stage cyclone for classification, the coarse particles return to the first-stage ball mill for regrinding, and the fine particles enter a stage of high-frequency vibrating fine screen, and the products under the screen are qualified Products, the products on the sieve enter the second-stage cyclone for classification, the coarse particles of the second-stage cyclone enter the second-stage ball mill for regrinding, and the fine particles enter the second-stage high-frequency fine sieve. The screened material enters the second-stage cyclone for classification, and the second-stage high-frequency fine sieve and the first-stage high-frequency fine sieve are combined to form a comprehensive grinding product. The advantage of this process is that it occupies a small area, The process is short and there are few equipments. The disadvantage is that the "over-grinding phenomenon" of ore is serious, and the difference in grindability of coarse and fine grains is not considered, resulting in high energy consumption and low production capacity.

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