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Treatment method for recovering iron from sintered red mud

A treatment method and technology of sintering method are applied in the treatment field of iron recovery from red mud by sintering method, which can solve the problems of high consumption of chemical reagents such as acid and alkali, high requirements on equipment quality, easy corrosion and damage of equipment by chemical reagents, etc. Recovery rate and concentrate grade, simple preparation process, improved ferromagnetic effect

Inactive Publication Date: 2015-09-02
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chemical leaching is mainly used to obtain iron in red mud by recovery and sintering. This method not only needs to consume a large amount of chemical reagents such as acid and alkali, but also, chemical reagents are easy to corrode and damage equipment, which requires high equipment quality.

Method used

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  • Treatment method for recovering iron from sintered red mud
  • Treatment method for recovering iron from sintered red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The processing method of reclaiming iron in a kind of sintering method red mud of the present invention, its specific steps are as follows:

[0029] (1) Filtrate the sintering method red mud with a total iron grade of 21.8%, heat and dry in a drying oven, then grind, mix, and divide by quartering method, and sample 50 g of sintering method red mud sample;

[0030] (2) Mix the carbon powder and the sintered red mud sample according to the mass ratio of 1:0.5 to obtain the mixed material, and then grind the mixed material to an average particle size of less than 0.074mm, and the mixed material with a particle size of less than 0.074mm accounts for 80- 100%;

[0031] (3) Roast the mixed material at 600°C for 20 minutes without air isolation. After the roasting is completed, put the roasted mixed material into cold water for quenching at a high temperature of 600°C to obtain a cooled red mud sample ;

[0032] (4) Let the cooled red mud sample stand for precipitation to ob...

Embodiment 2

[0035] The processing method of reclaiming iron in a kind of sintering method red mud of the present invention, its specific steps are as follows:

[0036] (1) Filtrate the sintering method red mud with a total iron grade of 21.8%, heat and dry in a drying oven, then grind and mix, divide by quartering, and sample 70 g of the sintering method red mud sample;

[0037] (2) Mix the carbon powder and the sintered red mud sample according to the mass ratio of 1:1 to obtain the mixed material, and then grind the mixed material to an average particle size of less than 0.074mm, and the mixed material with a particle size of less than 0.074mm accounts for 80- 100%;

[0038] (3) Roast the mixed material at 800°C for 30 minutes without air isolation. After the roasting is completed, put the roasted mixed material into cold water for quenching at a high temperature of 800°C to obtain a cooled red mud sample ;

[0039] (4) Let the cooled red mud sample stand for precipitation to obtain a...

Embodiment 3

[0042] The processing method of reclaiming iron in a kind of sintering method red mud of the present invention, its specific steps are as follows:

[0043] (1) Filtrate the sintering method red mud with a total iron grade of 21.8%, heat and dry in a drying oven, then grind, mix, and divide by quartering method, and sample 90 g of sintering method red mud sample;

[0044] (2) Mix the carbon powder and the sintered red mud sample according to the mass ratio of 1:1 to obtain the mixed material, and then grind the mixed material to an average particle size of less than 0.074mm, and the mixed material with a particle size of less than 0.074mm accounts for 80- 100%;

[0045] (3) Roast the mixed material at a temperature of 1000 °C and isolate the air for 40 minutes. After the roasting is completed, under the high temperature condition of 1000 °C, quickly put the roasted mixed material into cold water for quenching to obtain cooled red mud sample;

[0046] (4) Let the cooled red mu...

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Abstract

The invention belongs to the technical field of comprehensive utilization of solid waste discharged during alumina production by sintering and particularly relates to a treatment method for recovering iron from sintered red mud. The treatment method comprises the concrete steps that firstly, the sintered red mud is filtered, dried, pulverized and stirred to be even, so that well mixed sintered red mud is obtained; afterwards, carbon powder and the well mixed sintered red mud are sequentially subjected to mixing, grinding, roasting, water quenching and static settlement, so that a deposit is obtained; finally, the deposit is ground, water is added to the deposit, ore pulp is obtained through preparation, and the ore pulp is separated through a high-intensity magnetic separator, so that iron ore concentrate and red mud tailings slag are obtained. The treatment method has the advantages that the technology process is simple, energy consumption is low, there is no special requirement for equipment, and industrialization is easy to implement, thereby having important significance for utilization of the solid waste and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste discharged from alumina production by a sintering method, and in particular relates to a treatment method for recovering iron from red mud by a sintering method. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. For every ton of alumina produced, 1.0-2.0 tons of red mud is incidentally produced. Red mud is generally in the form of fine-grained powder, named for its appearance similar to red soil, in which the iron content is relatively high (generally between 5% and 15%), and it is weakly magnetic Fe 2 o 3 Mainly, so it can be used as a new resource for the production of iron concentrate. Fe in red mud 2 o 3 The recovery is also conducive to the comprehensive utilization of other useful components. At present, iron ore is mainly separated by magnetic separation equipment, but most of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 刘艳杰尚哲潘岐林屈文鑫王云王一烽
Owner CHANGAN UNIV
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