Beneficiation method for high carbonate iron ore

A beneficiation method and carbonate technology, which are applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of high production cost and low resource utilization rate, and achieve the effect of stable product index and good economy.

Inactive Publication Date: 2015-05-13
鞍钢集团矿业公司有限公司
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AI Technical Summary

Problems solved by technology

[0003] At present, Guanbaoshan Iron Mine has built a concentrator. The index of the concentrator is 31.15% of the raw ore grade, 64% of the final concentrate grade, and 20% of the final tailings grade. The recovery rate is less than 60%, and the resource utilization rate is low. higher production costs

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  • Beneficiation method for high carbonate iron ore
  • Beneficiation method for high carbonate iron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The Anshan-type iron ore with high carbonate 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 fraction of the particle size -0.074mm in the classified overflow product is obtained. 60% of the total weight of the Anshan type iron ore of high carbonate; the iron grade of the Anshan type iron ore of the high carbonate is 30%, wherein the weight content of carbonate is 30%;

[0031] 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 separ...

Embodiment 2

[0036] Method is with embodiment 1, and difference is:

[0037] (1) The iron grade of Anshan type iron ore with high carbonate is 28%, and the weight content of carbonate is 35%; 70% of the total weight of type iron ore;

[0038] (2) The iron grade of the mixed coarse ore is 52%; the magnetic field strength for weak magnetic separation is 0.3T, and the magnetic field strength for the first-stage strong magnetic separation and the second-stage strong magnetic separation is 1.2T;

[0039] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 15%, then heat it to 680°C for 30s, place it in a reducing atmosphere for 10 minutes, and then air cool it to below 50°C; the iron grade of the magnetite coarse ore is at 55%; the reducing atmosphere is a hydrogen atmosphere;

[0040] (4) Add water to the coarse magnetite ore to make a slurry with a weight concentration of 40%, stir for 35 minutes, and pre-select to control the magnetic field strength to 0.25T; the...

Embodiment 3

[0043] Method is with embodiment 1, and difference is:

[0044] (1) The iron grade of Anshan type iron ore with high carbonate is 25%, and the weight content of carbonate is 45%; 75% of the total weight of type iron ore;

[0045] (2) The iron grade of the mixed coarse ore is 47%; the magnetic field strength is 0.2T for weak magnetic separation, and 1.2T for the first stage of strong magnetic separation and the second stage of strong magnetic separation;

[0046] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 15%, then heat it to 650°C for 60 seconds, place it in a reducing atmosphere for 15 minutes, and then air-cool it to below 50°C; the iron grade of the magnetite coarse ore is at 50%; reducing atmosphere is gas atmosphere;

[0047](4) Add water to the rough magnet ore to make a slurry with a weight concentration of 35%, stir for 30 minutes, and pre-select the control magnetic field strength to 0.2T; the iron grade of the rough concentrate i...

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Abstract

Provided is a beneficiation method for high carbonate iron ore, and belongs to the technical field of the mineral processing. The method comprises the following steps: firstly, ore grinding processing is carried out on the high carbonate iron ore after the carbonate iron ore is crushed; secondly, weak magnetic separation, first-stage strong magnetic separation and second-stage strong magnetic separation are carried out on hierarchic flooding products to separate tailings, and concentrates are merged to be used as mixed roughs; thirdly, filtration is carried out on the mixed roughs, heating is carried out to eliminate water, heat preservation is carried out on the mixed roughs for three min to sixty min under a reducing atmosphere condition, and air cooling is carried out on the mixed roughs; fourthly, ore pulp is prepared by adding water, and pre-selection is carried out after stirring; fifthly, fine selection is carried out by an electromagnetic fine selecting machine after fine grinding is carried out, and water is eliminated by filtration. According to the method, the strong magnetic separation and the weak magnetic separation are adopted, baking and reducing are carried out, pre-selection, namely, ore grinding and fine selecting, is carried out, and the products with iron grade larger than sixty percent are obtained. The method has the advantages that the product index is stable, the economical efficiency is good, and resources can be efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a beneficiation method of high-carbonate iron ore. Background technique [0002] Anshan Iron and Steel Group Mining Company has nearly 1 billion tons of iron ore reserves in Guanbaoshan. Guanbaoshan iron ore belongs to Anshan type iron ore with high carbonate. The iron minerals in it are mainly siderite, hematite and a small amount of magnetite. The content of siderite (that is, carbonate) is usually in the Between 30 and 60%, there is 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 are non-metallic minerals. Among them, siderite, hematite and magnetite are the main iron-containing minerals. The particle size of hematite and magnetite is relatively small, and they are mainly associated with gangue minerals. Hematite and magnetite are associated. less related. Hem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 邓鹏宏韩跃新姚强薛敏解治宇
Owner 鞍钢集团矿业公司有限公司
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