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Method for concentrating extremely low-grade refractory magnetite

A magnetite and grade technology, applied in chemical instruments and methods, magnetic separation, wet separation, etc., can solve the problems of high iron ore yield, high ore hardness, and low beneficiation cost, so as to reduce the beneficiation ratio, Improve the recovery rate and reduce the effect of beneficiation energy consumption

Active Publication Date: 2013-03-20
安徽大昌矿业集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make full use of mineral resources and provide a method for beneficiating extremely low-grade refractory magnetite, which has high iron ore yield and low beneficiation cost, and solves the ore embedded particle size of extremely low-grade refractory ore fine, the hardness of the ore is high, and the problem of secondary pollution to the environment is avoided

Method used

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Embodiment Construction

[0024] A kind of beneficiation method of extremely low-grade refractory magnetite, comprises the following steps:

[0025] (1) The extremely low-grade 450-0mm magnetite with fine-grained impregnated cloth is coarsely crushed underground by a jaw crusher. The bulk magnetic separator dry selects waste, and the 200-0mm product enters the standard cone crusher for secondary crushing;

[0026] (2) After secondary crushing, the products are discarded through dry selection of magnetic pulleys, and the discarded products are then secondary crushed. After secondary crushing, they are screened, and the products on the sieve larger than 25mm are returned to secondary crushing, and the products under the 25-0mm sieve enter High-pressure roller mill for closed-circuit fine crushing;

[0027] (3) Finely crushed and then sieved, the sieved products larger than 4mm are returned to finely crushed, and the 4-0mm sieved products enter the permanent magnetic powder ore dry magnetic separator for...

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Abstract

The invention discloses a method for concentrating extremely low-grade refractory magnetite to achieve higher-grade iron ore concentrate. The process proposal comprises the following steps of: dry type magnetic separation and tailing rejecting, stage grinding, wet type magnetic separation, magnetic concentrate fine screening classification, minus sieve magnetic separation, plus sieve regrinding and recleaning and concentrate extraction directly through magnetic separation of an electromagnetic wreathed column. Namely, on the basis of conducting stage grinding separation on crude ore, electromagnetic concentration, fine screening and plus sieve regrinding and recleaning are implemented to improve the final iron ore concentrate grade. With the method adopted, the production cost is reduced, the concentrate grade is raised up to 71.96 percent, the tailings grade is decreased to 4.50 percent and the secondary pollution to the environment is also avoided.

Description

technical field [0001] The invention relates to a beneficiation technology, in particular to a beneficiation method of extremely low-grade refractory magnetite and a beneficiation equipment thereof. Background technique [0002] The southern section of the Wuji Iron Mine in Huoqiu County is a large-scale iron ore deposit, mainly composed of primary magnetite, oxidized hematite and less limonite. The total geological reserves are 235 million tons, including 30.9 million tons of 122b grade reserves, the extremely low grade is 20% lower than the cut-off grade, and the geological reserves of iron ore are 31.725 million tons. =12-18) extremely low-grade refractory metal ore. [0003] The original processing plant adopts the technological process of "pre-classification, open-circuit long barrel mill, stage grinding, and stage separation", and adopts two-stage grinding-three-stage fine screen-two-stage magnetic separation. After many years of mining, the proportion of ore that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B02C23/12B02C23/14B03C1/10
Inventor 王志良吉少清
Owner 安徽大昌矿业集团有限公司
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