Beneficiation method for magnetic mixed ore

Abstract

The invention belongs to the field of beneficiation of black metal ore, and particularly relates to a beneficiation method for magnetic mixed ore. The beneficiation method for the magnetic mixed ore comprises the steps of pulverization of raw materials, pre-beneficiation of the pulverized raw materials, treatment of screened rough concentrate, and treatment of screened tailings. A rough concentrate primary-grading procedure used for screening the rough concentrate is additionally conducted after pre-screening of the raw materials and before treatment of the rough concentrate. Compared with a conventional magnetic ore beneficiation technique, a ZCLA preseparator is used for wet screening of products which are fine pulverized through a closed circuit and ultrafine pulverized through an open circuit, 20% of barren rocks in magnetic iron ore can be effectively removed, and grading can be achieved in advance through pre-screening of the concentrate, and thus part of products with qualified granularities directly enter the next production procedure; and the grinding quantity can be effectively reduced, the probability of excessive grinding is lowered, the grinding grade and the ore grinding efficiency are improved, and energy consumption for ore grinding is reduced.

Description

technical field [0001] The invention belongs to the field of beneficiation of ferrous metal ore, in particular to a beneficiation method of magnetic mixed ore. Background technique [0002] It is one of the high-efficiency technical processes for iron ore mines to reduce the cost of beneficiation by applying large-grain and coarse-grain pre-selection to throw out tailings in advance. The magnetic separation pre-selection process of iron ore has two operation modes: dry type and wet type. After the magnetite ore is coarse, medium and fine crushed, it is screened and classified. Generally, the material above 6mm is pre-selected by dry type, and the concentrate obtained from the pre-selection is returned to the crushing operation. The following ones use wet pre-selection to achieve better results. The configuration of the particle size tailing throwing process is cumbersome and the process links are complicated. There are almost no wet pre-selection processes that can achiev...

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Problems solved by technology

[0003] Chinese patent CN201210015609.7 discloses a magnetic ore beneficiation method, but this method directly feeds the pre-selected concentrate into the ball mill without pre-selection and classification. For finely crushed ore with more powder after open-circuit ultra-fine crushing, Part of the qualified size products in the pre-selected concentrate enter the ball mill, which not only increases the grinding load, but also produces different degrees of over-grinding, which reduces the grinding efficiency

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