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Method for recovering aluminum from red mud slag

A technology for recycling aluminum and red mud, which is applied in the field of metallurgy, can solve the problems of unfavorable recycling of other components, troublesome sediment purification, and low comprehensive utilization, so as to eliminate impacts and hidden dangers of accidents, high reaction completion, and high recovery rate Effect

Active Publication Date: 2016-06-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has complex steps, single recovered components, and the purification of the separated precipitate in the process is troublesome, which is not conducive to the recovery and utilization of other components.
[0006] The process route of the existing technology is relatively complicated, and the treatment process is cumbersome. Most of them are dedicated to the recovery of one or two elements, and the comprehensive utilization is low. Other components in the red mud are more discarded, and a large amount of waste residue will still be discharged.

Method used

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  • Method for recovering aluminum from red mud slag

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Effect test

Embodiment 1

[0035] The solid waste red mud produced by alumina contains 8% iron in the slag after iron recovery. The slag is mixed with concentrated sulfuric acid for sulfation roasting. Water, immerse in water for 1.5 hours, filter, add excess ammonia water to the filtrate to remove aluminum, add ammonia water so that the pH value of the leachate is 1.5-2, stop adding ammonia water, react for 20 minutes, then collect aluminum sulfate ammonia precipitation, wash, dry, that is Obtained, the purity is greater than 98.0%.

Embodiment 2

[0037]The solid waste red mud produced by alumina contains 5% iron in the slag after iron recovery. The slag is mixed with concentrated sulfuric acid for sulfation roasting. The weight of the slag and concentrated sulfuric acid is 1:3, roasting for 1 hour, and then adding 1 times Water, immerse in water for 2 hours, filter, pass through excess ammonia gas to remove aluminum from the filtrate, stop feeding ammonia gas when the pH of the leaching solution is 1.5-2, react for 30 minutes, and collect aluminum sulfate ammonium precipitate , washed, dried, and the purity is greater than 98.5.

Embodiment 3

[0039] The red mud is first dried to remove most of the water, so that the water content of the red mud is 12% of the total weight, and the red mud with a certain water content is made into balls, and then the red mud balls are dried by using the heat of the tail gas combustion of the reduction furnace , and then dry red mud balls, coke, limestone, and dolomite are mixed in a ratio of 25:15:2:1, added to the reduction furnace for ironmaking, and iron and slag are obtained by separating iron slag. The slag is added to the reduction furnace for ironmaking. The hot air temperature of the reduction furnace for ironmaking is 900-1000°C, the wind pressure is 220mmHg, the melting temperature in the furnace is 1550-1600°C, and the furnace temperature is higher than 1400°C. Iron and slag are obtained by separating the iron slag. ; The iron content in the slag of the solid waste red mud produced by alumina is 3% after recycling iron, and the slag is mixed with concentrated sulfuric acid ...

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Abstract

The invention provides a method for recovering aluminum from red mud slag. The method comprises the following steps of recovering iron from red mud, solid waste of aluminum oxide production, mixing the slag after iron recovery and concentrated sulfuric acid for sulfating roasting, draining water to form a mixed solution containing metatitanic acid, adding excessive ammonia water or charging ammonia to extract an aluminum sulfate ammonia precipitate, and successfully recovering the aluminum from the red mud reduced iron slag. The method takes the ironmaking slag of the red mud, the solid waste of the aluminum oxide production, as a raw material to recover the aluminum, the titanium recovery rate can reach above 98%, and the obtained product, aluminum sulfate ammonia, is high in purity and good in quality.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for recovering aluminum from red mud slag, the waste waste of extracting alumina from ores. Background technique [0002] In the alumina production of aluminum ore by the Bayer process, bauxite is mixed with lime and circulating lye to make qualified pulp and then dissolved. Under the action of high temperature and high pressure, the alumina in the ore enters the solution, and the insoluble matter is red mud. After the dissolution, the ore pulp is diluted and settled for solid-liquid separation, and the bottom flow red mud slurry produced is reverse washed three times, filtered to recover the attached alkali, and then discharged. The production of 1 ton of alumina will produce 1.1 to 1.5 tons of red mud. With the rapid development of the alumina industry in recent years, the global annual alumina production has reached nearly 100 million tons, and China's alumina production in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/06C22B3/04C22B3/44C21B11/00
CPCY02P10/20
Inventor 刘保伟甘霖梁愈斌张正林许家伟谭金玉吴缨
Owner GUIZHOU BRANCH CHINA ALUMINUM IND