Method of dealkalizing red mud and recovering aluminum and iron

A technology for recycling aluminum and red mud, which is applied in chemical industry and construction materials, metallurgy and preparation of construction materials, and metallurgy, which can solve the problems of high processing cost and difficulty in industrialization, and achieve easy industrialization, low processing cost and process flow simple effect

Inactive Publication Date: 2013-04-10
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods either have relatively high proce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The liquid-solid ratio of a mixed solution of Bayer red mud and sulfuric acid is 3; the concentration of sulfuric acid is 30g / l; then the mixed solution is put into a heated and stirred container for stirring, the temperature is 110°C, and the stirring speed is 200r / l min, the leaching time is 20min, and then the solution is washed and filtered, the number of washings is 3 times, and the obtained filter residue is the treated red mud; the Na in the treated red mud 2 The O content is 0.85%. After neutralization precipitation and resin adsorption treatment, the recovery rates of aluminum and iron entering the solution are 82% and 90% respectively, and the purity of sodium sulfate after crystallization is greater than 92%.

Embodiment 2

[0021] The liquid-solid ratio of a mixed solution of Bayer red mud and sulfuric acid is 5; the concentration of sulfuric acid is 150 g / l; min, the leaching time is 70min, and then the solution is washed and filtered, the number of washings is 8 times, and the obtained filter residue is the treated red mud; the Na in the treated red mud 2 The O content is 0.21%. After neutralization precipitation and resin adsorption treatment, the recovery rates of aluminum and iron entering the solution are 75% and 88% respectively, and the purity of sodium sulfate after crystallization is greater than 93%.

Embodiment 3

[0023] The liquid-solid ratio of the mixed solution of red mud and sulfuric acid is 6; the concentration of sulfuric acid is 50g / l; then the mixed solution is put into a heated and stirred container for stirring, the temperature is 60°C, and the stirring speed is 500r / min, the leaching time is 70min, and then the solution is washed and filtered, the number of washings is 5 times, and the obtained filter residue is the treated red mud; the Na in the treated red mud 2 The O content is 0.41%. After neutralization precipitation and resin adsorption treatment, the recovery rates of aluminum and iron entering the solution are 70% and 94% respectively, and the purity of sodium sulfate after crystallization is greater than 85%. .

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Abstract

The invention discloses a method of dealkalizing red mud and recovering aluminum and iron. The method comprises the steps of mixing the red mud and sulfuric acid, roasting, or stirring and leaching, conducting water-leaching, washing and filtering on roasted or leached products, reducing the content of Na2O in solid slag to below 1%, and recovering the aluminum and the iron in a solution by methods such as neutralization sedimentation and resin adsorption. The method has the characteristic that the method is simple in treatment process, low in cost, easy to automatize and large in scale.

Description

technical field [0001] The present invention relates to the fields of metallurgy, chemical industry and building materials, especially in the fields of metallurgy and building materials preparation. After desodiumizing the waste residue red mud discarded by alumina plants, cement, sintered bricks, non-steamed bricks, etc. are prepared, and can be recycled at the same time. Among them aluminum and iron. Background technique [0002] Red mud is a polluting waste residue removed from the alumina industry. On average, 1 to 2 tons of red mud is produced for every 1 ton of alumina produced. my country, as the world's fourth largest producer of alumina, discharges more than 5.5 million tons of red mud every year. At present, the wet storage or dehydration and drying treatment of red mud reservoirs (dams) are often adopted, which not only invades farmland, pollutes the environment, and has hidden dangers of dam collapse, but also causes secondary waste of resources. Therefore, it is...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C21B15/00
CPCY02P10/20
Inventor 王家伟赵平源
Owner GUIZHOU UNIV
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