A method for comprehensive utilization of surrounding rock containing magnetite

Abstract

The invention discloses a comprehensive utilization method of a magnetite-containing country rock. The method comprises the following steps: (1) performing a first-stage dry magnetic separation to obtain rough concentrate of the first-stage dry magnetic separation, and using thrown tailings of the first-stage dry magnetic separation as concrete aggregate; (2) performing a second-stage dry magnetic separation to obtain rough concentrate of the second-stage dry magnetic separation, and using the thrown tailings of the second-stage dry magnetic separation as the concrete aggregate; (3) performing high-pressure roller grinding-wet coarse grain magnetic separation; and (4) performing staged wet ore grinding and magnetic separation operation. According to the method, the iron-containing country rock with total iron grade about 13% and magnetic iron grade about 7% can be treated, the iron ore concentrate with yield about 8%, total iron grade not less than 63% and magnetic iron recovery rate not less than 80% can be obtained besides the concrete aggregate with the yield about 70% and the granularity of 50-0mm. The method has the advantages of energy saving, environmental protection, strong adaptability, and good economic benefit, and can be widely applied to the magnetite mine, and especially suitable for treating the magnetite country rock with low grade.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and specifically relates to a method for dressing and comprehensive utilization of low-grade magnetite-containing surrounding rocks, and is particularly suitable for magnetite-containing surrounding rocks with a total iron grade of ≤13% and a magnetic iron grade of ≤7%. The comprehensive utilization of rock can be widely used in magnetite mines. Background technique [0002] In recent years, with the rapid development of the iron and steel industry, the production capacity of iron ore has continued to increase, the mine stripping ratio has increased year by year, and the amount of stripped iron-bearing surrounding rock has continued to increase. According to incomplete statistics, the stockpile of stripped surrounding rocks in my country's mines is tens of billions of tons at present, and the iron-containing surrounding rocks stripped from open-pit iron mines in my country alone reach more t...

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Problems solved by technology

[0006] Although the above two methods of utilization have partially utilized iron-containing surrounding rock to make it "turn waste into treasure", there are problems of one kind or another, such as "directly used as concrete aggregate or railway ballast" technology does not affect the iron-containing rock. The comprehensive recovery of iron ore resources in iron ore surrounding rocks has resulted in a waste of iron ore resources; while the "Technology for Efficient Recovery of Magnetite Resources in Iron Mine Rock Drainage System" adopts CT1424 permanent magnet large ore dry magnet The concentrator is used in the mine rock removal production system. Due to the large size (350mm) of the stripped iron-containing waste rock, the recovery rate of magnetite is low, which belongs to the situation of "recovering a little is a little". The recovery rate of magnetite in the rock is less than 40%, and when the grade difference between the ore and the surrounding rock is small, and the boundary between the surrounding rock and the ore is not clear, the separation of this large dry magnetic separator The effect is very unsatisfactory

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