Separation process of refractory iron ore

A sorting and iron ore technology, applied in magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems of low concentrate grade, unstable process, high roasting temperature, and achieve less loss of useful minerals and reaction conditions. The effect of relaxation, stable and easy-to-control process

Inactive Publication Date: 2015-10-21
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

[0014] Based on the above reasons, the iron ore reduction roasting-oxidation-magnetic separation process in the prior art has always had high roasting temperature, insufficient magnetism of roasted products, and Fe 3 o 4 Oxidation to prepare γ-Fe 2 o 3 The process is not stable enough, γ-Fe 2 o 3 Insufficient crystal transformation, difficult magnetic separation of products, high iron loss, low concentrate grade and many other defects lead to a low level of utilization of refractory iron ore
Those skilled in the art have so far been unable to find a refractory iron ore separation process based on the principle of reduction roasting-oxidation-magnetic separation that can be truly industrially applied with milder roasting conditions and better roasting effects

Method used

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  • Separation process of refractory iron ore
  • Separation process of refractory iron ore

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Effect test

Embodiment 1

[0031] An oolitic hematite in eastern Chongqing contains 40.56% iron and 1.02wt% phosphorus. The useful minerals are mainly red limonite, and the embedded particle size is fine. After the raw ore is crushed to no more than 5mm, the high-pressure roller mill is used for fine crushing, and the wind force gas phase classification is used to obtain finely crushed mineral materials with a particle size of not greater than 1mm, and the weight of -0.1mm (that is, not greater than 0.1mm) particle size mineral materials accounts for the weight of finely crushed mineral materials 75% of that; put the material into a suspension magnetization roasting furnace and roast it in an oxygen-free atmosphere. The roasting conditions are: the volume fraction of CO in a reducing atmosphere is 30%, and the CO 2 The volume fraction is 70%, the roasting temperature is 560°C, the roasting time is 450s, the cold wind speed is 2.1m / s, and the useful mineral is Fe 3 o 4 The roasted material; the composit...

Embodiment 2

[0038] The grade of TFe in the raw ore is 38.91%. According to the phase analysis of iron, the iron in this iron ore mainly occurs in siderite, and its content is 24.98wt%. The second part of iron is hematite and limonite. Form exists, the iron content is 16.67wt%; another 0.28wt% iron exists in other iron-bearing minerals.

[0039] Steps:

[0040] The dry and powdery raw ore is subjected to flash magnetization roasting in a suspension magnetization roaster under high-temperature reducing atmosphere conditions to obtain useful minerals as Fe 3 o 4 The roasted material, wherein, the volume fraction of CO in the reducing atmosphere is 25%, CO 2 The volume fraction is 75%, the roasting temperature is 520°C, and the roasting time is 350s; before roasting, the ore feeding particle size is not greater than 1mm, and -0.1mm particle size ore accounts for 81wt%; the feeding cooling air volume: 1.5m 3 / h, pressure 0.04MPa; hot air volume: 4m 3 / h, the apparent wind speed in the su...

Embodiment 3

[0044] The grade of TFe in the raw ore is 36.22%. According to the phase analysis of iron, the iron in the iron ore mainly occurs in limonite, with a content of 25.20wt%. The content is 10.15wt%; another 0.87wt% iron exists in other iron-containing minerals.

[0045] Steps:

[0046] The raw ore is subjected to suspension magnetization roasting in a suspension magnetization roasting furnace under high-temperature reducing atmosphere conditions to obtain useful minerals as Fe 3 o 4 The roasted material, wherein, the volume fraction of CO in the reducing atmosphere is 20%, CO 2 The volume fraction is 80%, the roasting temperature is 550°C, and the roasting time is 355s; before roasting, the ore feeding particle size is not greater than 1mm, and -0.1mm particle size mineral materials account for 90wt%; the feeding cooling air volume: 1.8m 3 / h, pressure 0.05MPa; hot air volume: 4.5m 3 / h, the apparent wind speed in the suspension magnetization roasting furnace is 0.48m / s.

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Abstract

The invention provides a separation process for refractory iron ores. The separation process comprises the following steps of: magnetizing and baking dry powdered raw ores with the particle size being less than 1mm at flash speed under a high-temperature reduction atmosphere condition at the temperature of 520 to 560 DEG C to obtain baked materials with available ores being Fe3O4, separating the baked materials to obtain concentrate. By the process, a baking process is executed under a stable and controllable condition by controlling the particle size of the raw ores, reducing the baking temperature and selecting proper baking time; the raw ores (such as ferrous carbonate) are fully decomposed, and reducing reaction is stable; furthermore, overburning is avoided, and a phenomenon that a part of magnetite is reduced into Fourier bodies is avoided; the quality of a baked product is uniform; loss of available ores is low; the reaction energy consumption is low; the reaction condition is mild; a process is stable and easy to control and the separation process can be used for separation of the refractory iron ores, such as poor (magnetic) iron cores, siderite, limonite and oolitic hematite; gamma-Fe2O3 fine ores with high grade which is generally not lower than 60 percent) can be obtained; and the full iron recycling rate is not lower than 75 percent.

Description

technical field [0001] The invention relates to a beneficiation method of iron ore, in particular to a separation process of refractory iron ore. Background technique [0002] There are many kinds of iron minerals. At present, more than 300 kinds of iron minerals and iron-containing minerals have been discovered, of which more than 170 kinds are common. However, under the current technical conditions, the main ones with industrial utilization value are magnetite, hematite, maghemite, ilmenite, limonite and siderite. [0003] The complex and refractory iron ores in my country mainly include Anshan-type lean red (magnetic) iron ore, siderite, limonite, oolitic hematite, etc., which are disseminated by fine particles. Iron ore, Panzhihua vanadium-titanium magnetite, Jilin Lingyang iron ore, etc. [0004] Among them, the Anshan-style magnetic-depleted (red) iron ore impregnated with fine particles has extremely fine particle size, and the dissociation and separation of mineral ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/015C22B1/02
Inventor 张裕书杨耀辉刘亚川陈炳炎张少翔
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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