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Method for recycling scandium from red mud slag

A technology of red mud and slag, which is applied in the field of metallurgy, can solve problems such as troublesome processing technology, low comprehensive utilization, and waste slag discharge, and achieve the effects of high reaction completion, good product quality, and fast reaction speed

Active Publication Date: 2014-03-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process route of the existing technology is relatively complicated, the treatment process is troublesome, the comprehensive utilization is low, and other components in the red mud are discarded more, and a large amount of waste residue will still be discharged

Method used

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  • Method for recycling scandium from red mud slag

Examples

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Comparison scheme
Effect test

Embodiment 1

[0054] 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, and extract the metal salt mixed solution after water soaking and filtering with P2O4 extraction mixed solvent, the volume ratio of P2O4 extraction mixed solvent and metal salt mixed solution is 1:8, separate the organic phase, and use 100g / L of sodium hydroxide solution back-extracts the organic phase to obtain a scandium-rich precipitate with a content of 1.31%. The back-extracted precipitate is dissolved with 2mol / L hydrochloric acid, and then heated and hydrolyzed after adding 80 g / L of sodium hydroxide solution to adjust the pH value of the solution to 1.5; The filtrate after filtering to remove titanium is extracted with tributyl phosphate, the organic phase is back-extracted with 90g / L sodium hydroxide solution, the back-extracted residue is dissolved wit...

Embodiment 2

[0056] The solid waste red mud produced by alumina contains 5% iron in the slag after iron recovery, and the slag is mixed with concentrated sulfuric acid for sulfation roasting. The weight of the slag and concentrated sulfuric acid is 1:1, roasted for 1 hour, and then added twice Water, soak in water for 2 hours, filter, and extract the metal salt mixed solution after water soaking and filtering with P2O4 extraction mixed solvent, the volume ratio of P2O4 extraction mixed solvent and metal salt mixed solution is 1:10, separate the organic phase, and use 100g / 1 L of sodium hydroxide solution back-extracts the organic phase to obtain a scandium-rich precipitate with a content of 1.47%. The back-extracted precipitate is dissolved with 4mol / L hydrochloric acid, and then heated and hydrolyzed after adding 70 g / L potassium hydroxide solution to adjust the pH value of the solution to 2.5; The filtrate after filtering to remove titanium is extracted with tributyl phosphate, the organ...

Embodiment 3

[0058] 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 solid waste red mud produced by alumina contains 3% iron in the slag after recycling iron, and the slag is mixed with concentrated sulfuric acid for ...

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Abstract

The invention provides a method for recycling scandium from red mud slag. The method comprises the following steps: carrying out sulfating roasting on red mud iron slag, soaking the processed slag in water, filtering so as to obtain filter residue gypsum, extracting the filtrate, carrying out a back extraction treatment on the organic phase with an alkaline solution of alkali metal, collecting the precipitate, dissolving the precipitate with hydrochloric acid, filtering, then adjusting the pH value of the filtrate with an alkaline solution of alkali metal, heating to carry out hydrolysis so as to turn titanium element into precipitate, filtering, collecting the filtrate; extracting the titanium-free filtrate with tributyl phosphate, then carrying out a back extraction treatment on the organic phase with an alkaline solution of alkali metal, collecting the precipitate, dissolving the precipitate with sulfuric acid, filtering, adding potassium sulfate into the filtrate to carry out double-salt reactions, then adding an alkaline solution of alkali metal into the double salt to carry out alkali conversion, collecting the precipitate, dissolving the precipitate with hydrochloric acid, adding oxalic acid into the solution to generate scandium oxalate precipitate, and collecting the precipitate. The method has the advantages of simple technology and easy operation, comprehensively utilizes the red mud, and eliminates the pollution to the environment and incident hazard caused by red mud piles.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for recovering scandium 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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IPC IPC(8): C22B7/04C22B59/00
CPCY02P10/20
Inventor 刘保伟甘霖梁愈斌许家伟张正林谭金玉张凤朵
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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