Method for recovering titanium from red mud slag

A technology for recovering titanium and red mud, which is applied in the field of metallurgy, can solve problems such as low comprehensive utilization, troublesome treatment process, and waste residue discharge, and achieve the effects of high reaction completion, fast reaction speed, and high recovery rate

Active Publication Date: 2014-02-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 titanium from red mud slag

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Embodiment 1

[0042] 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, soak in water for 1.5 hours, filter, add excess ammonia water to the filtrate to remove aluminum, make aluminum sulfate into aluminum sulfate and remove it after ammonium precipitation. After filtration, add metatitanic acid seed crystals to the filtrate and heat for hydrolysis. The value is 2.0, the hydrolysis time is 60 minutes, the seed crystal content is 0.2% of the solution weight, the metatitanic acid crystals are filtered out, cleaned, and calcined at a temperature of 900°C to obtain titanium dioxide with a purity of 95%.

Embodiment 2

[0044] 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, soaked in water for 2 hours, filtered, the filtrate was passed through excess ammonia gas to remove aluminum, so that aluminum sulfate became aluminum sulfate and ammonium precipitated and removed. After filtration, metatitanic acid seed crystals were added to the filtrate and heated for hydrolysis. The hydrolysis temperature was 105°C. The hydrolysis pH value is 2.3, the hydrolysis time is 90 minutes, the seed crystal content is 0.5% of the solution weight, the metatitanic acid crystals are filtered out, cleaned, and calcined at a temperature of 850°C to obtain titanium dioxide with a purity of 96%.

Embodiment 3

[0046] 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 temperature of the hot air in 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 sulfuri...

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Abstract

The invention provides a method for recovering titanium 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 ammonia water to remove aluminum to purify a titanium solution, hydrolyzing to crystallize and precipitate metatitanic acid, roasting metatitanic acid to form titanium dioxide, and successfully recovering the titanium 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, a technology is simple, a recovery rate is high, the comprehensive utilization of red mud is achieved, the cost related to red mud stockpiling is lowered, and the influence on an environment and accident potential caused by the red mud stockpiling are eliminated. The titanium recovery rate can reach above 70%, and the obtained product, titanium dioxide, 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 titanium 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 1.1-1.5 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 201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/12
CPCY02P10/20
Inventor 刘保伟甘霖张正林许家伟梁愈斌谭金玉
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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