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A pre-selection process for surrounding rock containing magnetite

A mine enclosure and magnet technology, which is applied in the field of pre-selection of low-grade magnetite-containing surrounding rocks, can solve the problems of low yield of tailings building materials and high crushing energy consumption, so as to reduce emissions, improve selection grade, and reduce disposal volume effect

Active Publication Date: 2017-04-26
SINOSTEEL MAANSHAN INST OF MINING RES CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method only pre-selects tailings after high-pressure roller milling. The crushing energy consumption of the system is extremely high, and the particle size of the tailings is still relatively fine. up to 30%

Method used

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  • A pre-selection process for surrounding rock containing magnetite
  • A pre-selection process for surrounding rock containing magnetite
  • A pre-selection process for surrounding rock containing magnetite

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Embodiment Construction

[0026] In order to describe the present invention, a pre-selection process of magnetite-containing surrounding rock of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0027] The object of treatment in this embodiment is the magnetite-containing surrounding rock stockpiled in the dump site of the Nanshan mining area of ​​Masteel Group. The multi-element analysis and iron phase analysis of the magnetite-containing surrounding rock were carried out, and the results are shown in Table 1 and Table 2.

[0028] Table 1 Chemical multi-element analysis results of magnetite-bearing surrounding rocks (%)

[0029]

[0030] Table 2 Analytical results of iron phases in surrounding rocks containing magnetite (%)

[0031]

[0032] The analysis shows that the iron content of the surrounding rock containing magnetite is very low, with a total iron grade of 12.37% and a magnetic iron grade of 6.40%; impurities S...

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Abstract

The invention discloses a preselecting process for surrounding rock containing magnetite. According to a technical scheme in the invention, the preselecting process comprises the following steps: (1) carrying out medium crushing and first-stage dry preselection so as to obtain first-stage dry preselection rough concentrate, wherein ejected first-stage dry preselection mine tailing is used as concrete aggregate; (2) carrying out fine crushing and second-stage dry preselection so as to obtain second-stage dry preselection rough concentrate, wherein ejected second-stage dry preselection mine tailing is used as concrete aggregate; (3) carrying out high-pressure roller grinding-wet coarse grain preselecting so as to obtain wet coarse grain preselected concentrate and ejecting wet coarse grain preselected mine tailing; and (4) sieving or grading the wet coarse grain magnetic separation mine tailing obtained in the step (3), wherein obtained coarse grain mine tailing is sold as a substitute for constructional yellow sand. When the preselecting process is used for treating iron-containing surrounding rock with total iron grade of about 13% and magnetic iron grade of about 7%, concrete aggregate with yield of about 70% and a particle size of 50 to 0 mm can be obtained, and the substitute for constructional yellow sand can also be obtained; and the preselecting process has the advantages of energy saving, environmental protection, good adaptability, good economic benefits, etc., and can be widely applied to magnetite mines.

Description

technical field [0001] The invention relates to a method for preselecting magnetite, in particular to a method for preselecting low-grade magnetite-containing surrounding rocks, which 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 than 800 million tons every year. For example, Masteel’s Gaocun Iron Mine has an annual rock removal volume of about 11 million tons, Ansteel’s Dagushan Iron Mine’s belt system has an annual rock removal volume ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B02C23/14
CPCB02C21/00B02C23/14
Inventor 陈洲王维勤常鲁平任文田黄瑛彩刘军张志华袁启东王章李亮洪振川皇甫明柱张永虞力王炬
Owner SINOSTEEL MAANSHAN INST OF MINING RES CO LTD
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