Beneficiation method for preparing ultra-pure iron ore concentrate by adopting magnetite concentrate

A technology for ultra-pure iron ore concentrate and beneficiation method, applied in chemical instruments and methods, flotation, wet separation, etc., can solve the problem that the iron grade of the concentrate is not ideal, it is not conducive to large-scale production, and the iron grade of the concentrate is not high. problems, to achieve the effect of simple system, strong applicability and environmental friendliness

Active Publication Date: 2020-12-18
SINOSTEEL MAANSHAN INST OF MINING RES +1
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Problems solved by technology

"Modern Mining" 2016 No. 11 "Experiment on Preparation of Ultra-pure Iron Concentrate by Deep Processing of an Ordinary Iron Concentrate in Liaoning" article. Flotation purification can obtain iron grade of 71.91%, SiO 2 Ultra-pure iron concentrate with 0.23% content and 0.21% acid insoluble matter, due to the lack of stage grinding, the iron grade of the concentrate is not high
"A method for preparing ultra-pure iron concentrate powder by using ordinary grade iron ore" (CN104673993A), the iron concentrate pre-en

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  • Beneficiation method for preparing ultra-pure iron ore concentrate by adopting magnetite concentrate

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Experimental program
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Effect test

Embodiment 1

[0023] The TFe grade of a commercial-grade magnetite concentrate in China is 67.84%, and the main impurity is SiO 2 、Al 2 o 3 , CaO, and MgO contents are 5.20%, 0.36%, 0.028%, and 0.024%, respectively, and the contents of other impurity elements are relatively low.

[0024] The ore sample is separated by stage grinding, stage magnetic separation-reverse flotation process. First, it undergoes a stage of ball milling, classification, and magnetic separation. The overflow particle size of the spiral classifier is -0.076mm, accounting for 90%. / m, the magnetic separation concentrate obtained is then adopted a grinding and grading system composed of a vertical stirring mill and a hydrocyclone. The overflow particle size of the cyclone is -0.038mm, accounting for 95%. One-time selection, roughing magnetic field intensity is 143.31kA / m, roughing concentrate is demagnetized and then refined, and the magnetic field strength of selection is 95.54kA / m, concentrated ore is concentrated ...

Embodiment 2

[0026] The TFe grade of a commercial grade magnetite concentrate in China is 66.72%, and the main impurity is SiO 2 、Al 2 o 3 , CaO, and MgO contents are 6.18%, 0.68%, 0.28%, and 0.22%, respectively, and the contents of other impurity elements are relatively low.

[0027]The ore sample is separated by stage grinding, stage magnetic separation-reverse flotation process. First, it undergoes a stage of ball milling, grading, and magnetic separation. / m, the magnetic separation concentrate obtained is then adopted a grinding and grading system composed of a vertical stirring mill and a hydrocyclone. The overflow particle size of the cyclone is -0.038mm, accounting for 90%. One-time selection, roughing magnetic field intensity is 159.24kA / m, roughing concentrate demagnetization treatment and then concentration, selection magnetic field strength is 127.39kA / m, selection concentrate is concentrated after demagnetization treatment, concentrated underflow to Into the reverse flotati...

Embodiment 3

[0029] The TFe grade of a commercial grade magnetite concentrate in China is 68.20%, and the main impurity is SiO 2 、Al 2 o 3 , CaO, and MgO contents are 4.53%, 0.27%, 0.024%, and 0.020%, respectively, and the contents of other impurity elements are relatively low.

[0030] The ore sample is separated by stage grinding, stage magnetic separation-reverse flotation process. First, it undergoes a stage of ball milling, grading, and magnetic separation. / m, the magnetic separation concentrate obtained is then adopted a grinding and grading system composed of a vertical stirring mill and a hydrocyclone. The overflow particle size of the cyclone is -0.038mm, accounting for 90%. One-time selection, roughing magnetic field intensity is 127.39kA / m, roughing concentrate is demagnetized and then refined, the magnetic field strength of selection is 95.54kA / m, concentrated concentrate is concentrated after demagnetization, and the concentrated underflow is given to Enter the reverse flo...

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Abstract

The invention discloses a beneficiation method for preparing ultra-pure iron ore concentrate by adopting magnetite concentrate. First-stage ore grinding-grading-first-stage low-intensity magnetic separation, first-stage low-intensity magnetic separation concentrate concentration and dehydration, second-stage ore grinding-grading, second-stage low-intensity magnetic separation roughing-demagnetization-second-stage low-intensity magnetic separation concentration, second-stage low-intensity magnetic separation concentration concentrate demagnetization-concentration operation are separately adopted; demagnetization treatment is carried out on the obtained second-stage low-intensity magnetic separation concentration concentrate, and then concentration and reverse flotation operation are carriedout; and finally, the ultra-pure iron ore concentrate with the TFe content larger than 72.0%, the SiO<2> content smaller than or equal to 0.20% and the acid insoluble matter content smaller than or equal to 0.17% and the high-purity iron ore concentrate with the TFe content larger than 70.7% are obtained. A reverse flotation operation collecting agent is prepared by heating and modifying dodecylamine and a glacial acetic acid solution according to the mass ratio of 4: 1. The method has the advantages of flexible and variable beneficiation process flow, stability, reliability, high applicability, high efficiency and energy conservation. A flotation reagent is simple in system, raw materials are wide in source, small in dosage, good in selectivity and very environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation method for processing ultra-pure iron concentrate by using commercial-grade magnetite concentrate, especially suitable for high-quality commercial-grade magnetite with a TFe of 66.5% to 68.9%. Concentrate preparation of TFe>72.0%, SiO 2 Ultra-pure iron concentrate with content ≤0.20%. Background technique [0002] Ultra-pure iron concentrate usually requires TFe grade greater than 72.0%, SiO 2 The content of other impurities (acid insolubles) is less than 0.2%, which is an important source of raw materials for new iron-based mineral materials, and can be used to produce powder metallurgy, magnetic materials, ultra-pure iron and clean steel base materials, etc. [0003] Although my country is rich in iron ore resources, the resources suitable for processing ultra-pure iron concentrates are very limited, mainly distributed in a few ar...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B9/00B03D1/018B02C21/00B03D101/02B03D103/04
CPCB03B7/00B03B9/00B03D1/018B02C21/00B03D2201/02B03D2203/04
Inventor 沈进杰高春庆王海亮骆洪振侯更合杨任新
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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