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Comprehensive iron-aluminium paragenetic mineral utilization method

A technology of iron-aluminum symbiotic ore and ore powder, which is applied in the field of metallurgy, can solve the problems of high price, high production cost, and difficult effective separation, and achieve the effects of high-efficiency dissociation extraction, low production cost, and improved dissolution rate

Active Publication Date: 2012-07-25
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The method of beneficiation first and then smelting adopts the method of beneficiation to separate the minerals of iron and aluminum, but the iron and aluminum minerals in many iron-aluminum paragenetic ores are embedded together, so it is difficult to effectively separate them; the scheme of first aluminum and then iron adopts Bayer method to leaching to produce alumina , the obtained iron-rich red mud enters the blast furnace for ironmaking, but dealkalization must be carried out before the red mud enters the blast furnace, which is difficult to realize industrially; in the scheme of iron before aluminum, blast furnace ironmaking is used, and blast furnace slag is used to extract alumina, but blast furnace ironmaking The use of expensive coke makes the method technically feasible, but the production cost is high and there is no economic benefit

Method used

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  • Comprehensive iron-aluminium paragenetic mineral utilization method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. First, the weight percentage containing Al 2 o 3 20%, Fe 2 o 3 50%, SiO 2 5%, the iron-aluminum paragenetic ore that is impurities is crushed to 2-5mm, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Add mineral powder to the rotating disc pelletizer, add water to make cue balls, and then add water and materials continuously to make the cue balls grow and dry to form pellets. The pellets are placed in the pre-reduction reactor, and the reduction gas is introduced for pre-reduction to obtain the pre-reduction ore. The composition of the reduction gas contains 70% CO, H 2 30%

[0024] Among them, the reduction temperature is 850°C, the reduction time is 180min, and the pre-reduction reactor is a rotary hearth furnace or a shaft furnace; the Fe in the pre-reduction ore is 2 o 3 The weight content of FeO is 5%, the weight content of FeO is 60%, and the weight content of metallic iron is 8%. The tail gas generat...

Embodiment 2

[0030] 1. First, the composition contains Al by weight percentage 2 o 3 40%, Fe 2 o 3 30%, SiO 2 15%, the iron-aluminum paragenetic ore which is impurities is crushed to 2-5mm, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Put the mineral powder into the rotating disc pelletizer, add water to make cue balls, and then add water and materials continuously, so that the cue balls grow up and then dry to form pellets. The pellets are placed in the pre-reduction reactor, and the reducing gas is introduced into the pre-reduction to obtain the pre-reduced ore. The above-mentioned reducing gas composition contains 90% CO, H 210%, wherein the reduction temperature is 1050°C, the reduction time is 30min, and the pre-reduction reactor is a rotary hearth furnace or a shaft furnace; the tail gas generated during the pre-reduction process is separated to form CO 2 and gas. of which CO 2 For carbonation decomposition, excess CO 2 Co...

Embodiment 3

[0036] 1. First, the composition contains Al by weight percentage 2 o 3 30%, Fe 2 o 3 40%, SiO 2 10%, the iron-aluminum paragenetic ore that is impurities is crushed to 2-5mm, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Add mineral powder to the rotating disc pelletizer, add water to make cue balls, and then add water and materials continuously to make the cue balls grow and dry to form pellets. The pellets are placed in the pre-reduction reactor, and the reduction gas is fed into the pre-reduction to obtain the pre-reduction ore. The reduction gas composition contains 80% CO, H 2 20%, wherein the reduction temperature is 950°C, the reduction time is 90min, and the pre-reduction reactor is a rotary hearth furnace or a shaft furnace; the Fe in the pre-reduction ore obtained by the above method 2 o 3 The weight content of FeO is 7.5%, the weight content of FeO is 50%, and the weight content of metallic iron is 5%. T...

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Abstract

A comprehensive iron-aluminium paragenetic mineral utilization method belongs to the technical field of metallurgy. The comprehensive iron-aluminium paragenetic mineral utilization method is carried out according to the following steps: iron-aluminium paragenetic mineral is ground and made into pellets, and reducing gas is filled to pre-reduce the pellets, so that pre-reduced mineral is obtained;the pre-reduced mineral and lime are put into a reduction and melting furnace, and with oxygen as carrier gas, pulverized coal is jetted to carry out melting and reduction, so that molten iron and high-temperature aluminium-containing molten slag are obtained; the high-temperature aluminium-containing molten slag is cooled to normal temperature and naturally powdered, so that slag is obtained, and the slag is put into sodium carbonate solution and leached, so that leachate and leaching residue are obtained; the leachate is desiliconized under normal pressure and desiliconized under medium pressure, so that refined liquor is obtained; CO2 is filled into the refined liquor to carry out carbonation decomposition, so that decomposed mother liquor and aluminium hydroxide are obtained, and the aluminium hydroxide is roasted, so that alumina is produced; sodium carbonate is added into the decomposed mother liquor to replenish alkali, and the produced sodium carbonate solution is used for leaching. The comprehensive iron-aluminium paragenetic mineral utilization method not only can guarantee the high-efficiency dissociation and extraction of iron and aluminium, but also is feasible technically and economically, and the iron-aluminium paragenetic mineral resource in China is effectively and comprehensively utilized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a comprehensive utilization method of iron-aluminum symbiotic ore. Background technique [0002] my country has very rich reserves of iron-aluminum symbiotic ore, which belongs to symbiotic multi-metal composite ore. The useful minerals are mainly gibbsite or gibbsite, goethite, and hematite, which account for 70-80% of the ore , the secondary minerals are illite, anatase, opal duromanganese and so on. Strictly speaking, the iron-containing grade of this kind of ore has no economic extraction value from the perspective of iron and steel metallurgy; at the same time, due to its low A / S ratio, it does not have the value of extracting Al from the perspective of non-ferrous metallurgy. 2 o 3 the value of. However, for our country where iron and aluminum ore resources are relatively scarce, comprehensive utilization of this resource is of great significance. [0003]...

Claims

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Application Information

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IPC IPC(8): C22B5/12C22B1/24C22B3/04C22B21/00
CPCY02P10/20
Inventor 于海燕武建强潘晓林刘保伟王波毕诗文顾松青
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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