Beneficiation method for refractory iron ores

A beneficiation method and iron ore technology, which is applied in the beneficiation field of refractory iron ore, can solve problems such as inability to mine and utilize resources, difficult beneficiation, and inability to realize separation, etc., and achieve the effect of good economy and stable product indicators

Inactive Publication Date: 2015-05-06
鞍钢集团矿业公司有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned characteristics of Lazishan Iron Mine, it is a kind of refractory ore, which cannot be separated by conventional beneficiation process, which makes it impossible to mine and utilize this resource at present.

Method used

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  • Beneficiation method for refractory iron ores
  • Beneficiation method for refractory iron ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The refractory 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 refractory Anshan 60% of the total weight of the type iron ore; the iron grade of the refractory Anshan type iron ore is 30%;

[0033] The graded overflow products are subjected to weak magnetic separation through a weak magnetic separator to obtain a weak magnetic separation concentrate and a weak magnetic separation tailings. The iron grade of the weak magnetic separation concentrate is 68%, accounting for 12% of the total weight of the refractory Anshan type iron ore. %; The weak magnetic separation tailings are subjected to strong magnetic separation through a strong magnetic separator to obtain strong magnetic separation concentrates and strong magnetic separation tailings; the iron grade of stro...

Embodiment 2

[0038] Method is with embodiment 1, and difference is:

[0039] (1) The fraction of particle size -0.074mm in the classified overflow product accounts for 70% of the total weight of the refractory Anshan iron ore; the iron grade of the refractory Anshan iron ore is 28%;

[0040] (2) The iron grade of the weak magnetic separation concentrate is 67%, accounting for 15% of the total weight of the refractory Anshan iron ore; the iron grade of the strong magnetic separation concentrate is 28%; the magnetic field strength during the weak magnetic separation is 0.2T, The magnetic field strength during strong magnetic separation is 1.2T;

[0041] (3) Filter the strong magnetic separation concentrate to obtain a filter cake with a water weight of 15%, then heat it to 680°C for 30s to remove moisture, and place it in a reducing atmosphere for 10 minutes; the iron grade of the coarse magnetite is 32%; The reducing atmosphere is a hydrogen atmosphere;

[0042] (4) Add water to the rough...

Embodiment 3

[0045] Method is with embodiment 1, and difference is:

[0046] (1) The fraction of particle size -0.074mm in the classified overflow product accounts for 75% of the total weight of the refractory Anshan iron ore; the iron grade of the refractory Anshan iron ore is 25%;

[0047] (2) The iron grade of the weak magnetic separation concentrate is 67%, accounting for 19% of the total weight of the refractory Anshan iron ore; the iron grade of the strong magnetic separation concentrate is 25%; the magnetic field strength during the weak magnetic separation is 0.2T, The magnetic field strength during strong magnetic separation is 1.0T;

[0048] (3) Filter the concentrated ore by strong magnetic separation to obtain a filter cake with a water weight of 20%, then heat it to 650°C for 60 seconds to remove moisture, and place it in a reducing atmosphere for 20 minutes; the iron grade of the coarse magnetite is 30%; The reducing atmosphere is gas atmosphere;

[0049](4) Add water to th...

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Abstract

The invention discloses a beneficiation method for refractory iron ores, belonging to the technical field of mineral processing and comprising the following steps: (1) crushing the refractory iron ores and grinding; (2) carrying out low-intensity magnetic separation and high-intensity magnetic separation; (3) filtering concentrates obtained from the high-intensity magnetic separation to obtain filter cakes, heating the filter cakes to remove moisture, preserving the heat of the cakes in a reducing atmosphere, and performing air cooling; (4) adding water to prepare ore pulp, stirring and beneficiating preliminarily; (5) levigating and beneficiating finely, mixing the obtained finely beneficiated concentrates with concentrates obtained from the low-intensity magnetic separation, and filtering to remove the moisture. According to the method disclosed by the invention, through the high-intensity magnetic separation, low-intensity magnetic separation, roasting, reducing, preliminarily beneficiating, grinding and finely beneficiating, products with iron grade greater than 60% can be obtained; meanwhile, product indexes are stable, the economy is good, and resources can be utilized efficiently.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a beneficiation method of refractory iron ore. Background technique [0002] The Lazishan Iron Ore Reserve of Anshan Iron and Steel Group Mining Company is nearly 500 million tons. Through rock ore identification of mineral composition and content statistics, it is found that the iron minerals are mainly siderite, hematite and magnetite, of which the magnetite content is the highest, accounting for 40-60% of the iron mineral content, followed by The content of hematite is 25~40%, and the content of siderite is 5~15%. There are also a small amount of earthy hematite and limonite. In addition, the sample also contains a small amount of pyrite and trace chalcopyrite, and the rest It is a non-metallic mineral; among them, siderite, hematite and magnetite are the main iron-containing minerals. The monomer dissociation degree of hematite is low, and the monomer dissociation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B1/00B03C1/025
CPCB03B7/00
Inventor 马旭峰李艳军刘双安陈占金解治宇
Owner 鞍钢集团矿业公司有限公司
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