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Method for recycling electrolyte in aluminium electrolysis waste tank lining through ultrasonic-assisted pressing alkaline leaching

A pressurized alkali leaching and ultrasonic technology, which is applied in the field of aluminum electrolysis solid waste resource recovery, can solve the problems that the recovery process cannot be reasonably and effectively applied, the electrolyte components cannot be efficiently recovered, and the electrolyte recovery rate is low, so as to shorten the alkali leaching time, The effect of short production cycle and increased separation effect

Active Publication Date: 2016-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Waste aluminum electrolysis tank linings with low carbon content are generally landfilled or used as roadbed materials after harmless treatment. The existing treatment process cannot efficiently recover the electrolyte components in waste tank linings with low carbon content, or due to the complexity of the process , low production efficiency, low electrolyte recovery rate and other reasons make some recovery processes cannot be reasonably and effectively applied to the recycling of waste tank linings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 10g of the waste tank lining of an aluminum electrolytic cell in a domestic factory, and the measured main component content is (wt%): C 28.14, SiO 2 27.45 Fe 2 o 3 7.84, Na 2 O 13.27, Al 2 o 3 7.19, F 8.04.

[0036] step one

[0037] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare granules, in which the granules with a particle diameter less than 0.074mm account for 90% of the total mass of the spare granules;

[0038] step two

[0039] Prepare the spare granules obtained in step 1 and water to form a slurry according to the liquid-solid ratio of 2:1, and process the slurry in an ultrasonic wave for 15 minutes, with an ultrasonic frequency of 40KHz and a power of 200W;

[0040] step three

[0041] Add the ultrasonically treated pulp obtained in step 2 into the alkali solution with a NaOH concentration of 2mol / L at a liquid-solid ratio of 8:1. The alkali leaching process is carried out in an autoclave under press...

Embodiment 2

[0069] Take 20g of the waste tank lining of an aluminum electrolytic cell in a domestic factory, and the measured main component content is (wt%): C 28.14, SiO 2 27.45 Fe 2 o 3 7.84, Na 2 O 13.27, Al 2 o 3 7.19, F 8.04.

[0070] step one

[0071] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare granules, the spare granules having a particle diameter of less than 0.074 mm account for 100% of the total mass of the spare granules;

[0072] step two

[0073] Prepare the spare granules obtained in step 1 and water to form a slurry according to the liquid-solid ratio of 2:1, and process the slurry in an ultrasonic wave for 5 minutes, with an ultrasonic frequency of 40KHz and a power of 600W;

[0074] step three

[0075] Add the ultrasonically treated pulp obtained in step 2 into the alkali solution with a NaOH concentration of 1mol / L at a liquid-solid ratio of 8:1. The alkali leaching process is carried out in an autoclave under pr...

Embodiment 3

[0081] Take 30g of the waste tank lining of an aluminum electrolytic cell in a domestic factory, and the measured main component content is (wt%): C 28.14, SiO 2 27.45 Fe 2 o 3 7.84, Na 2 O 13.27, Al 2 o 3 7.19, F 8.04.

[0082] step one

[0083] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare granules, in which the particles with a particle diameter less than 0.074mm account for 80% of the total mass of the spare granules;

[0084] step two

[0085] Prepare the spare granules obtained in step 1 and water to form a slurry at a liquid-solid ratio of 3:1, and process the slurry in an ultrasonic wave for 20 minutes with an ultrasonic frequency of 25KHz and a power of 400W;

[0086] step three

[0087] Add the ultrasonically treated pulp obtained in step 2 into the alkali solution with a NaOH concentration of 5mol / L at a liquid-solid ratio of 8:1. The alkali leaching process is carried out in an autoclave under pressure, with a ...

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Abstract

The invention relates to a method for recycling an electrolyte in an aluminium electrolysis waste tank lining through ultrasonic-assisted pressing alkaline leaching, and belongs to the technical field of recycling of solid waste resources of aluminium electrolysis. The method comprises the steps of crushing and grinding the aluminium electrolysis waste tank lining till the particle size is 0.074 mm or below; blending the waste tank lining powder and water into slurry, and carrying out ultrasonic pretreatment; carrying out pressure leaching on the treated slurry through alkali liquor, and carrying out filtering separation; and burying filter residues, and introducing a filtrate into CO2 to separate out an electrolyte sediment. According to the method, through the synergistic effect of ultrasonic treatment and pressure leaching, soluble substances in the waste tank lining are dissolved in the alkali liquor to a maximum extent to be recycled; the method is simple in technological process, short in treatment cycle, free of secondary pollution, and suitable for treating the aluminium electrolysis waste tank lining low in carbon content; and during the entire treatment process, the electrolyte recovery rate is 96.84%, and the process cycle is 90 min.

Description

technical field [0001] The invention relates to a method for recovering electrolyte in aluminum electrolysis waste tank linings by ultrasonic-assisted pressurized alkali leaching, and belongs to the technical field of aluminum electrolysis solid waste resource recovery. Background technique [0002] With the rapid development of the national economy, the supply of resources and energy has become increasingly tense, and energy conservation and emission reduction have become the theme of technological innovation in the aluminum industry in the 21st century. Improving the ecological environment, increasing the utilization rate of resources, promoting the harmony between man and nature, implementing sustainable development, and building an innovative country are the strategies of my country's current economic development. Since 2001. China has become the world's largest producer of primary aluminum. [0003] The initial composition of the aluminum electrolytic cell lining is m...

Claims

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Application Information

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IPC IPC(8): C25C3/18C25C3/08
CPCC25C3/08C25C3/18
Inventor 肖劲袁杰田忠良杨凯黄金堤余柏烈仲奇凡赖延清李劼
Owner CENT SOUTH UNIV
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