A New Combination Process of Fine Grinding and Classification Suitable for Separation of Fine Magnetite Ore

Abstract

The invention discloses a novel fine grinding-classification combined technology suitable for sorting of micro-fine particle magnetic iron ore. The process comprises the steps that a novel feeding material of which the particle size is -0.075 mm 52-60% and the ore pulp weight concentration is 40-45% is fed into a primary cyclone set for classification, settled sand in the primary cyclone set is fed into a tower mill, material ore pulp subjected to fine grinding through the tower mill is returned into the primary cyclone set, overflow in the primary cyclone set is fed into a permanent magnetic drum separator for magnetic separation, and qualified tailings are discharged; and magnetic separation rough concentrate obtained through the permanent magnetic drum separator is fed into a secondary cyclone set to be further classified, settled sand in the secondary cyclone set is returned into the tower mill again to be subjected to fine grinding, and overflow in the secondary cyclone set is fed into the next procedure to be further sorted. According to the novel fine grinding-classification combined technology, a closed circuit grinding process is adopted for continuous circulation, so that micro-fine particle magnetite is basically subjected to monomer separation, and the combined technology has the advantages of being low in ore grinding energy consumption, fine and uniform in ore grinding product, high in concentrate grade, small in ore grinding technology investment, low in production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and specifically relates to a grinding and grading process of fine-grained magnetite ore, which is especially suitable for fine grinding, grading, and magnetic separation operations using tower mills as fine grinding equipment to replace conventional ball mills. Second and third stage closed circuit grinding. Background technique [0002] my country is relatively rich in iron ore resources. As of the end of 2015, the ascertained reserves of iron ore resources were about 90 billion tons, most of which were poor iron ore that required beneficiation, accounting for about 98% of the total iron ore reserves; Iron ore accounts for about 30% of the total iron ore reserves. In the field of iron ore beneficiation technology, iron ore with a particle size of 0.045 to 0.025 mm is a fine-grained particle. At present, the fine grinding equipment used for iron ore beneficiation in my country is mai...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a suitable ball mill for the problems of high energy consumption, low dissociation degree of iron ore, low grade of iron ore concentrate, large investment and high cost when grinding fine-grained iron ore in the existing conventional ball mill. A New Combination Process of Fine Grinding and Classification for Sorting Microfine Magnetite Ore

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