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Ore dressing method of iron ore

A beneficiation method and iron ore technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of difficulty in complete dissociation, affecting the yield of iron, affecting the grade of iron concentrate, etc., and achieving good economy. , the effect of stable product indicators

Inactive Publication Date: 2015-05-13
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) In the ore, hematite and quartz are closely embedded and wrapped in each other, and it is difficult to completely dissociate from each other; the intercalation relationship between hematite and magnetite is relatively close, and hematite replaces magnetite, forming an indeterminate Miscible and continuous crystals; hematite is filled and cemented by limonite, and intergranular limonite is often filled with network veins, so it is difficult to completely dissociate hematite and limonite, and limonite entering iron concentrate will affect the iron content. Concentrate grade; In addition, some hematite fine particles are wrapped in limonite, which is difficult to dissociate, and is easy to be lost in the tailings with limonite, which affects the yield of iron;

Method used

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  • Ore dressing method of iron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The Donganshan 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 Donganshan iron ore 90% of the total weight; the iron grade of the said Donganshan iron ore is 25%;

[0038] 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 second stage of strong magne...

Embodiment 2

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

[0044] (1) The iron grade of the Dong’anshan iron ore mentioned above is 28%; the portion of the graded overflow product with a particle size of -0.074mm accounts for 85% of the total weight of the Dong’anshan iron ore;

[0045](2) The iron grade of the mixed coarse ore is 44%; the magnetic field strength of the weak magnetic separation is 0.3T, and the magnetic field strength of the first-stage strong magnetic separation and the second-stage strong magnetic separation is 1.3T;

[0046] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 15%, then heat it to 700°C for 60 seconds, 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 46 %; Reducing atmosphere is hydrogen atmosphere;

[0047] (4) Add water to the magnetite coarse ore to make a slurry with a weight concentration of 30%, stir for 10 minutes to eliminate ...

Embodiment 3

[0050] Method is with embodiment 1, and difference is:

[0051] (1) The iron grade of the Dong’anshan iron ore mentioned above is 30%; the portion of the graded overflow product with a particle size of -0.074mm accounts for 80% of the total weight of the Dong’anshan iron ore;

[0052] (2) The iron grade of the mixed coarse ore is 48%; the magnetic field strength of the weak magnetic separation is 0.2T, and the magnetic field strength of the first-stage strong magnetic separation and the second-stage strong magnetic separation is 1.0T;

[0053] (3) Filter the mixed coarse ore to obtain a filter cake with a water weight of 20%, then heat it to 650°C for 120s, place it in a reducing atmosphere for 20min, and then air-cool it to below 50°C; the iron grade of the magnetite coarse ore is 50 %; reducing atmosphere is gas atmosphere;

[0054] (4) Add water to the magnetite coarse ore to make a slurry with a weight concentration of 35%, stir for 30 minutes to eliminate electrostatic a...

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Abstract

The invention relates to an ore dressing method of an iron ore, and belongs to the technical field of minerals processing. The ore dressing method comprises the following steps: (1) carrying out the ore grinding treatment after the iron ore is broken; (2) carrying out the low intensity magnetic separation, primary-section high intensity magnetic separation and secondary-section high intensity magnetic separation on classified overflow products by virtue of a low intensity magnetic separation machine, mixing the primary-section high intensity magnetic separated ore concentrate, the secondary-section high intensity magnetic separated ore concentrate and the low intensity magnetic separated ore concentrate to be used as mixed coarse ore; (3) filtering the mixed coarse ore, heating and dehydrating the mixed coarse ore, then thermally preserving the mixed coarse ore for 5 to 60 minutes under a reduction atmosphere condition, and cooling the ore in the air to obtain magnet coarse ore; (4) mixing the magnet coarse ore with water to form ore pulp, stirring the ore pulp, and then pre-selecting the ore pulp by utilizing a barrel-type magnetic separator; (5) grinding the coarse concentrate, then finely selecting the ground coarse concentrate by utilizing an electromagnetic fine selecting machine, filtering and dehydrating the obtained finely-selected concentrate, and thus obtaining the concentrate product with iron grade of 63 to 68 percent. By adopting the method, a product with the iron grade more than 60 percent can be obtained, the product index is stable, the economic efficiency is good, and the resource can be efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to an iron ore beneficiation method. Background technique [0002] Donganshan iron ore has been used as raw material for sinter production by Anshan Iron and Steel Group Donganshan Sintering Plant. It has a history of more than 50 years since the establishment of the plant in 1958. The results of the process mineralogy of the ore are as follows: [0003] (1) The metal minerals of this iron ore are mainly iron minerals, the content of metal sulfide is very low, the iron minerals are mainly hematite, and the contents of magnetite, limonite and goethite are relatively small; non-metallic The main mineral is quartz, and other non-metallic minerals include carbonate minerals, chlorite, actinolite and apatite, etc.; [0004] (2) Hematite and magnetite are recycled minerals in the ore, with large magnetic differences, and the contents of limonite and goethite about 2.50%; [...

Claims

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Application Information

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IPC IPC(8): B03C1/10B02C21/00
Inventor 邵安林韩跃新杨光高鹏刘雁翎
Owner ANSTEEL GRP MINING CO LTD
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