Beneficiation method for complex iron ore

A beneficiation method and iron ore technology, which are applied in the field of complex iron ore beneficiation to achieve stable product indicators and good economy.

Inactive Publication Date: 2015-05-20
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the existing complex Anshan-type iron ore dressing technology, the present invention provides a kind of dressing method for complex iron ore, which first pre-enriches through ore grinding-magnetic separation-beneficiation, and then performs roasting and reduction , and finally carry out pre-selection, grinding and concentration, while reducing costs, increase yield and obtain high-grade iron ore products

Method used

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  • Beneficiation method for complex iron ore

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Experimental program
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Effect test

Embodiment 1

[0028] The complex Anshan-type iron ore is crushed to a particle size of 2~15mm, put into a closed-circuit grinding system composed of a ball mill and a cyclone for grinding treatment, and the part of the graded overflow product with a particle size of -0.074mm accounts for the complex Anshan-type iron ore 70% of the total weight of the ore; the iron grade of the complex Anshan iron ore is 35%;

[0029] The graded overflow product is subjected to weak magnetic separation through a weak magnetic separator to obtain weak magnetic separation concentrate and weak magnetic separation tailings, and the weak magnetic separation tailings are subjected to a high-level magnetic separation through a high-level magnetic separator to obtain a high-level magnetic separation Concentrate ore and tailings of the first stage of strong magnetic separation, the tailings of the first stage of strong magnetic separation will be subjected to the second stage of strong magnetic separation through the ...

Embodiment 2

[0034] Method is with embodiment 1, and difference is:

[0035] (1) The iron grade of the complex Anshan-type iron ore is 33%; the part of the graded overflow product with a particle size of -0.074mm accounts for 75% of the total weight of the complex Anshan-type iron ore;

[0036] (2) The iron grade of the weak magnetic separation concentrate is 67%, accounting for 16% of the total weight of the complex Anshan-type iron ore; the iron grade of the mixed coarse ore is 29%; the magnetic field strength during weak magnetic separation is 0.1T, a The magnetic field strength for strong magnetic separation and second stage strong magnetic separation is 1.0T;

[0037] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 20%, then heat it to 600°C for 90 seconds, and place it in a reducing atmosphere for 30 minutes; the iron grade of the magnetite coarse ore is 33%; the reducing atmosphere is a hydrogen atmosphere ;

[0038] (4) Add water to the coarse magne...

Embodiment 3

[0041] Method is with embodiment 1, and difference is:

[0042] (1) The iron grade of the complex Anshan-type iron ore is 31%; the part of the graded overflow product with a particle size of -0.074mm accounts for 80% of the total weight of the complex Anshan-type iron ore;

[0043] (2) The iron grade of the weak magnetic separation concentrate is 67%, accounting for 20% of the total weight of the complex Anshan-type iron ore; the iron grade of the mixed coarse ore is 31%; the magnetic field strength during the weak magnetic separation is 0.2T. The magnetic field strength for strong magnetic separation and two-stage strong magnetic separation is 1.2T;

[0044] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 15%, then heat it to 630°C for 60 seconds, and place it in a reducing atmosphere for 20 minutes; the iron grade of the magnetite coarse ore is 35%; the reducing atmosphere is a hydrogen atmosphere ;

[0045] (4) Add water to the coarse magnetit...

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Abstract

The invention provides a beneficiation method for complex iron ore and belongs to the technical field of mineral processing. The method includes the following steps that 1 ore grinding is conducted after the complex iron ore is crushed; 2 low intensity magnetic separation, first-stage high intensity magnetic separation and second-stage high intensity magnetic separation are conducted, and first-stage high intensity magnetic separation concentrate and second-stage high intensity magnetic separation concentrate are combined to serve as mixed coarse ore; 3 the mixed coarse ore is filtered, then heated to be dehydrated, placed under a reducing atmosphere condition for heat preservation and air-cooled; 4 water is added to the mixed coarse ore to manufacture ore pulp, and pre-selection is conducted after stirring; 5 fine selection is conducted after fine grinding, and obtained fine selection concentrate and low intensity magnetic separation concentrate are mixed, filtered and dehydrated. Pre-selection, ore grinding and fine selection are conducted after high intensity magnetic separation, low intensity magnetic separation, roasting and reduction, obtained products are stable in index and good in economical efficiency, and resources can be efficiently used.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a beneficiation method of complex iron ore. Background technique [0002] The iron ore mined by the Qianyanshan Iron Mine of Ansteel Group Mining Company mainly contains hematite, siderite, magnetite and limonite, and the non-metallic minerals are mainly quartz, calcite, dolomite, chlorite and muscovite etc. Among them, magnetite is the main recovered mineral. Since its mineral content is less than 50% of the iron mineral content, it is economically unreasonable to only recover magnetite. [0003] The iron ore in Yanyan Mountain contains a large amount of hematite and siderite, which belongs to a complex Anshan-type iron ore; among them, hematite and non-metallic minerals such as quartz are closely combined and wrapped in each other, so it is difficult to completely dissolve each other. The intercalation relationship between hematite and magnetite is relatively close,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/005B03C1/015B03C1/00
CPCB03B7/00B03C1/002B03C1/005B03C1/015
Inventor 马旭峰李艳军姚强薛敏杨光徐连生
Owner ANSTEEL GRP MINING CO LTD
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