Ore grinding grading system and method capable of controlling derichment of iron minerals

Abstract

The invention discloses an ore grinding grading system and method capable of controlling derichment of iron minerals. The ore grinding grading system comprises a feeding pulp tank, a feeding pump, a double-overflow-pipe swirler, a sand setting pulp tank, a mill, first separation equipment and an open-circuit grinding machine. The double-overflow-pipe swirler is provided with a swirler inlet, a setting sand outlet, an outer overflow outlet and an inner overflow outlet. An outlet of the feeding pulp tank is connected with an inlet of the feeding pump. An outlet of the feeding pump is connected with the swirler inlet. The setting sand outlet is connected with an inlet of the mill. An outlet of the mill is connected with the feeding pulp tank. The outer overflow outlet is connected with the first separation equipment. The inner overflow outlet is connected with an inlet of the open-circuit grinding machine. An outlet of the open-circuit grinding machine is connected with the first separation equipment. The ore grinding grading method includes the steps that ore pulp is fed into the double-overflow-pipe swirler to be graded, and the graded setting sand products, outer overflow products and inner overflow products are processed separately. By means of the ore grinding grading system and method capable of controlling derichment of the iron minerals, derichment of the iron minerals in setting sand can be reduced, the handling capacity of the mill is improved, the energy consumption for ore grinding is reduced, and the quality of ore concentrate products is improved.

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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