A grinding and grading system and method capable of controlling anti-enrichment of iron minerals

Abstract

A grinding and grading system and method capable of controlling the reverse enrichment of iron minerals, the system includes an ore feeding slurry tank, an ore feeding pump, a double overflow pipe cyclone, a sand settling ore slurry tank, a mill, and a first sorting equipment. And open-circuit grinding mill, double overflow tube cyclone is equipped with cyclone inlet, sand settling outlet, outer overflow outlet and inner overflow outlet, the outlet of the feeding slurry tank is connected with the inlet of the feeding pump, feeding The outlet of the pump is connected to the inlet of the cyclone, the outlet of the sand settling is connected to the inlet of the mill, the outlet of the mill is connected to the ore feeding slurry tank, the overflow outlet is connected to the first sorting equipment, and the inner overflow outlet is connected to the open-circuit grinding mill. The inlet is connected, and the outlet of the open-circuit grinding mill is connected with the first sorting equipment; the method is to send the pulp into the double overflow tube cyclone for classification, and separate the graded sand settling products, external overflow products and internal overflow products. to be processed. The invention can reduce the anti-concentration of iron minerals in the sand, improve the processing capacity of the mill, reduce the energy consumption of grinding and improve the quality of concentrate products.

Description

technical field [0001] The invention relates to the technical field of ore processing equipment, in particular to a grinding and grading system and method capable of controlling anti-enrichment of iron minerals. Background technique [0002] In iron ore processing, the grinding cost accounts for more than 50% of the total processing cost. And as the particle size of the iron ore to be processed gradually becomes finer, two or more stages of grinding are usually used, which further increases the grinding cost. Grinding and classifying technology is the core process of the mineral processing plant, and the classification overflow particle size and sand return ratio are the key factors that affect the grinding energy consumption, the processing capacity of the mill and the sorting index. [0003] At present, the secondary grinding (and multi-stage grinding) grinding, medium ore, and coarse concentrate regrinding and classification are basically closed-circuit grinding circuits...

AI Technical Summary

Problems solved by technology

When the fine sieve is used for classification, since the iron ore is heavy, it is easy to enter under the sieve, which can promote the positive enrichment of the iron ore to a certain extent, and the effect of reducing the anti-enrichment is obvious. It is 0.1mm, and the minimum gradable particle size can only reach 0.074mm. However, most iron ore in China now require the qualified particle size of grinding to be 0.045mm or below as the benchmark, and the price of the fine sieve is high, and the screen is easy to block, so this The application of this method is subject to many restrictions

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