Method for recovering aluminum from alumina production waste red mud

A waste and alumina technology, applied in the direction of aluminum sulfur compounds, aluminum sulfate, etc., can solve the problems of land occupation, environmental pollution, safety hazards, waste of resources, etc., and achieve the effect of easy production, large demand, and simple separation

Inactive Publication Date: 2014-08-13
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of red mud is piled up, which not only occupies land, wastes

Method used

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  • Method for recovering aluminum from alumina production waste red mud

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Embodiment 1

[0014] The method for recovering aluminum from alumina production waste red mud described in the present invention, the raw material used in this embodiment is red mud, includes the following steps:

[0015] 1. According to the liquid-solid volume mass ratio of 0.6:1, the red mud and industrial concentrated sulfuric acid are prepared into pulp, and the acid hydrolysis is obtained with stirring and acid hydrolysis for 60 minutes in a heated and stirred container at 250°C for 60 minutes.

[0016] 2. Add water to the acid hydrolysis slag according to the liquid-solid volume mass ratio of 3:1 to adjust the slurry, stir and leaching reaction at 80°C for 90 minutes, and separate the leaching slurry from solid and liquid with a filter press to obtain leaching liquid and leaching residue.

[0017] 3. Add potassium sulfate 1.2 times the theoretical value according to the aluminum content in the leaching solution, stir and react in a container with cooling and stirring for 90 minutes, th...

Embodiment 2

[0020] Another example of the method for recovering aluminum from alumina production waste red mud according to the present invention, the raw material used in this embodiment is red mud, including the following steps:

[0021] 1. According to the liquid-solid volume mass ratio of 1.6:1, red mud and industrial concentrated sulfuric acid are used to prepare ore pulp, and the acid hydrolysis is stirred and acidified for 60 minutes in a heated and stirred container at 200°C.

[0022] 2. Add water to the acid hydrolysis slag according to the liquid-solid volume mass ratio of the original red mud amount 4:1, stir and leaching reaction at 60°C for 120 minutes, and separate the leaching slurry from solid to liquid with a filter press to obtain leaching liquid and leaching residue .

[0023] 3. Add potassium sulfate 1.2 times the theoretical value according to the aluminum content in the leaching liquid, stir and react in a container with cooling and stirring for 90 minutes, the end p...

Embodiment 3

[0026] Another example of the method for recovering aluminum from alumina production waste red mud according to the present invention, the raw material used in this embodiment is red mud ironmaking slag, including the following steps:

[0027] 1. Red mud ironmaking slag and industrial concentrated sulfuric acid are used to prepare ore pulp with a liquid-to-solid volume-to-mass ratio of 1:1, and then stir and acidolyze in a heated and stirred container at 150°C for 30 minutes.

[0028] 2. Add water to the acid hydrolysis slag according to the ratio of liquid to solid volume and mass of the original slag of 7:1, stir and leaching reaction at 80°C for 120 minutes, and separate the leaching slurry from solid to liquid with a filter press to obtain leaching liquid and leaching slag.

[0029] 3. Add potassium sulfate 1.2 times the theoretical value according to the aluminum content in the leaching solution, stir and react in a container with cooling and stirring for 60 minutes, and t...

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Abstract

The invention relates to a method for recovering aluminum from alumina production waste red mud. The method comprises: 1, blending a raw material and industrial concentrated sulfuric acid into a mineral slurry with a liquid-solid volume mass ratio of 0.6-2.0:1, and carrying out stirring acidolysis for 20-120 min under a condition of self-heating or thermal insulation at a temperature of 150-250 DEG C; 2, according to the raw material amount liquid-solid volume mass ratio of 2-7:1, adding water to the acidolysis residue to carry out slurry blending, and carrying out a stirring leaching reaction for 20-120 min at a temperature of 60-100 DEG C; and 3, according to the aluminum content in the leaching solution, adding 1-1.2 times the theoretical value of potassium sulfate, carrying out a reaction for 20-120 min, and filtering to obtain alum, wherein the end temperature is 5-25 DEG C. According to the present invention, the industrial waste material is adopted as the main raw material so as to reduce environmental pollution and recover the aluminum element, the process is simple, the production is easy to achieve, the dealkalization treatment of the leaching slag is achieved, and other valuable metals are transferred and enriched into the end solution so as to provide conditions for comprehensive recovery.

Description

technical field [0001] The invention relates to the technical field of red mud treatment produced in the alumina production process, in particular to a method for recovering aluminum from red mud, which is a waste of alumina production, in particular to producing solid alumina directly from diaspore Bayer process A method for recovering valuable metal aluminum from waste red mud. Background technique [0002] Red mud is a by-product of extremely fine particles of strong alkaline solid waste produced in the process of producing alumina from bauxite. For every ton of alumina produced, about 0.8 to 1.5 tons of red mud are produced. my country is a big producer of alumina. In 2009, it produced 23.78 million tons of alumina, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. With the a...

Claims

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Application Information

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IPC IPC(8): C01F7/76
Inventor 谢营邦李伯骥詹海鸿何航军刘晨罗思强罗东明樊艳金李劼梁焕龙黄泰元容蓉柯剑华张建飞满露梅陶媛
Owner 广西冶金研究院有限公司
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