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Method for extracting metal scandium and titanium from red mud

A technology for extracting metals and red mud is applied in the field of extracting metal scandium and titanium, which can solve the problems of waste of resources and low comprehensive utilization of red mud, and achieve the effects of reducing processing costs, facilitating comprehensive utilization and high recovery.

Active Publication Date: 2008-05-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of scandium in the raw materials used in this method is relatively low, only 0.0082%. To produce 1 kg of scandium oxide, 328 tons of red mud need to be processed. Titanium is disposed of as an impurity, resulting in a waste of resources, and the comprehensive utilization of red mud is low

Method used

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  • Method for extracting metal scandium and titanium from red mud

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Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of high-purity scandium oxide:

[0030] First, use 4% hydrochloric acid and rich ore red mud at a liquid-solid ratio of 5.6:1 to react at 90°C for 5 minutes and then filter. Calculate the concentrated hydrochloric acid and water needed to prepare 19% hydrochloric acid according to the moisture in the filter cake. , according to the liquid-solid ratio L / S=3:1, react with the filter cake at 98°C for 30 minutes and then filter to obtain a leach solution containing scandium 52mg / L. The extraction agent is prepared by diisooctyl phosphate (P204): kerosene at a ratio of 1:49, and the extraction agent and the scandium-containing solution are mixed and reacted at a ratio of 1:8 for 10 minutes to obtain an organic phase containing scandium. Wash the scandium-containing organic phase 2 times with 19% hydrochloric acid at a ratio of 1:1 compared to O / A, and the washing time is 5 minutes / time to remove impurities such as part of titanium and iron in the scandium-contain...

Embodiment 2

[0037] Preparation of high-purity scandium oxide:

[0038] First, use 6% hydrochloric acid and rich ore red mud at a liquid-solid ratio of 4:1 to react at 90°C for 10 minutes and then filter. Calculate the concentrated hydrochloric acid and water needed to configure 19% hydrochloric acid according to the moisture in the filter cake. According to the ratio of liquid-solid ratio L / S=2.6:1, react with the filter cake at 95°C for 50 minutes and then filter to obtain a leach solution containing scandium 59mg / L. The extraction agent is prepared by diisooctyl phosphate (P204): kerosene at a ratio of 1:24, and the extraction agent and the scandium-containing solution are mixed and reacted at a ratio of 1:10 for 10 minutes to obtain an organic phase containing scandium. Wash the scandium-containing organic phase 2 times with 18% hydrochloric acid at a ratio of 1:1 compared to O / A, and the washing time is 5 minutes / time to remove impurities such as part of titanium and iron in the scand...

Embodiment 3

[0045] Preparation of high-purity scandium oxide:

[0046] First, use 5% hydrochloric acid and rich ore red mud at a liquid-solid ratio of 6:1 to react at 80°C for 15 minutes and then filter. Calculate the concentrated hydrochloric acid and water needed to configure 19% hydrochloric acid according to the moisture in the filter cake. According to the ratio of liquid-solid ratio L / S=3.5:1, react with the filter cake at 90°C for 30 minutes and then filter to obtain a leaching solution containing scandium 45mg / L. The extraction agent is prepared by diisooctyl phosphate (P204): kerosene at a ratio of 1:49, and the extraction agent and the scandium-containing solution are mixed and reacted at a ratio of 1:8 for 10 minutes to obtain an organic phase containing scandium. Wash the scandium-containing organic phase 2 times with 21% hydrochloric acid at a ratio of 1:1 compared to O / A, and the washing time is 5 minutes / time to remove impurities such as part of titanium and iron in the sca...

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Abstract

The invention relates to a method for extracting metal scandium and titanium from red mud; the method is used for extracting scandium and titanium from the red mud; the method takes the red mud which is produced through the sinter process of the high-grade ore two portion of clinker in alumina plant as the raw material; the hydrochloric acid with a concentration of 2 percent to 6 percent is used for leaching the calcium and sodium from the red mud to increase the content of the scandium and titanium in the red mud; and then the hydrochloric acid with a concentration of 16 percent to 22 percent is used for a second acid dipping of the red mud and the product of scandium oxide is obtained after the leaching liquid passes the processes of extraction, reverse extraction and baking; the hydrochloric acid with a concentration of 80 percent to 90 percent is used for a third acid dipping of the red mud after the second one and the leaching liquid is added with iron powder for reduction and then the temperature is reduced to crystallize and separate out iron in the pattern of FeSO<4>.7H<2>O; the acid liquid which contains titanium after the iron is removed is added with alkali and heated for hydrolysis; the product of titanium oxide is obtained after the hydrolysate is baked. The method is simple and easy to be carried out and most metal elements in the red mud can be recovered and the cost for processing the red mud is low, all of which are beneficial to the comprehensive utilization of the red mud.

Description

technical field [0001] The invention relates to a method for extracting metal scandium and titanium from red mud, which is used for extracting metal scandium and metal titanium in red mud. Background technique [0002] At present, the existing method of extracting scandium from red mud is to react the red mud produced in the alumina production process with 22-30% hydrochloric acid to obtain scandium-containing leachate, and then perform extraction, stripping, purification and other steps. The content of scandium in the raw materials used in this method is relatively low, only 0.0082%. To produce 1 kg of scandium oxide, 328 tons of red mud need to be processed. Titanium is disposed of as an impurity, resulting in a waste of resources, and the comprehensive utilization of red mud is low. Contents of the invention [0003] The purpose of the present invention is to provide a method for extracting metal scandium and titanium from red mud, which is simple and easy to implement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B34/10C22B3/06C22B3/44C22B3/26C22B3/22C22B1/02
CPCY02P10/20
Inventor 姜梅杨志华郑秀芳杨会宾周晓燕
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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