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Method for aluminum electrolysis cell waste cathode stripping treatment and fluoride recovery

A technology of aluminum electrolytic cell waste and recycling method, which is applied in the field of aluminum electrolytic cell dismantling and waste cathode treatment and comprehensive utilization, and can solve the problems of unsatisfactory pre-dissolution effect of soluble fluorine, difficulty in solid-liquid separation, and large amount of water for dissolution. Achieve the effect of comprehensive utilization of non-discharge resources, simple and easy method, and low processing cost

Inactive Publication Date: 2018-04-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (2) In order to remove soluble fluorine before flotation, a large amount of fluorine-containing wastewater will be produced. How to deal with these fluoride-containing wastewater is a big problem
[0011] (3) The pre-dissolution effect of soluble fluorine is not ideal, and the water consumption for dissolution is large, which needs further improvement;
[0012] (4) Difficulty in solid-liquid separation after dissolution treatment
In order to ensure the effect of dissolution treatment, the waste cathode is fully broken first, resulting in the need for solid-liquid separation to be completed in special equipment, which increases its treatment cost

Method used

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  • Method for aluminum electrolysis cell waste cathode stripping treatment and fluoride recovery
  • Method for aluminum electrolysis cell waste cathode stripping treatment and fluoride recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 : Waste cathode treatment and utilization of electrolytic aluminum production enterprises with an annual output of 200,000 tons of aluminum

[0035] (1) Basic information:

[0036] The electrolytic aluminum plant with an annual production capacity of 200,000 tons adopts 300kA large-scale prebaked tank electrolysis technology and prebaked anode roasting technology. The annual output of waste cathodes is 8,000 tons. In the past, safe landfill was used, but now it is treated by sorting, but the sorting effect is not good, and the wastewater is difficult to treat.

[0037] (2) Application method

[0038] According to the technology proposed by the present invention (see figure 1 ), set up four dissolution tanks (numbers A, B, C, D), and carry out four-stage dissolution treatment in sequence. That is to say, the waste cathode block is put into tank A first for primary dissolution; after the specified time, water control is proposed, and then it enters tank B ...

Embodiment 2

[0045] Example 2 : Application in waste cathode treatment of electrolytic aluminum enterprises with an annual output of 600,000 tons

[0046] (1) Basic information

[0047] The electrolytic aluminum plant with an annual production capacity of 600,000 tons adopts 300kA large-scale prebaked tank electrolysis technology and prebaked anode roasting technology. The annual output of waste cathodes is 20,000-24,000 tons. The flotation process is proposed to be used for treatment, and the first step is to realize the dissolution and harmless disposal of soluble fluorine and cyanide.

[0048] (2) Application method

[0049] According to the technology proposed by the present invention (see figure 1 ), in order to ensure the dissolution effect, five dissolution tanks (numbers A, B, C, D, E) are set up, and the five-stage dissolution treatment is carried out in sequence, and the operation mode is the same as that of the four-stage. That is to say, the waste cathode block is put int...

Embodiment 3

[0056] Example 3 : Application in centralized treatment of waste cathodes in industrial parks with an annual output of 1 million tons of electrolytic aluminum

[0057] (1) Basic information

[0058] Aluminum Industrial Park, with an annual electrolytic aluminum production capacity of 1 million tons. Adopt 200 ~ 350kA large pre-baked tank electrolysis technology and pre-baked anode roasting technology. The annual output of waste cathodes is 38,000-46,000 tons. The waste cathode adopts leaching treatment + flotation, the solid product is separated and comprehensively utilized, and the waste water is evaporated and crystallized.

[0059] (2) Application method

[0060] According to the process proposed by the present invention, four stripping tanks (numbered A, B, C, D) are set, and four-stage stripping treatments are carried out successively. In the operation design, the method of "adjusting tanks but not water" is adopted, that is, each leaching tank performs four-stage l...

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Abstract

The invention relates to a method for aluminum electrolysis cell waste cathode stripping treatment and fluoride recovery. The method comprises the steps that treatment is performed by adopting a large-particle waste cathode and multi-basin countercurrent leaching way for 10-14 hours; heating is performed by utilizing evaporated crystallized steam, leaching water is stirred, heat is recovered, andcondensation is performed; high-concentration fluorine-containing waste with the fluorine concentration of 16000-18000 ppm is obtained after dissolution, villiaumite is obtained through crystallization and evaporation, the evaporated water steam is used for heating, and water for leaching is stirred. The leaching efficiency of a system is remarkably improved, the water consumption and energy consumption are obviously reduced, and the problem of fluorine-containing and salt-containing wastewater discharge of the system can be thoroughly solved.

Description

technical field [0001] The invention relates to the field of dismantling and comprehensive utilization of waste cathodes of aluminum electrolytic cells, and proposes a high-efficiency countercurrent leaching and fluoride recovery method of waste cathodes of aluminum electrolytic cells, which is expected to solve the problem of comprehensive utilization of waste cathodes. Background technique [0002] During the production process of aluminum electrolysis, a large amount of electrolytic cell dismantling products will be produced, mainly waste cathodes, refractory materials, etc. Classified as hazardous solid waste due to soluble fluorine content. How to dispose of these wastes is one of the major issues limiting the development of the electrolytic aluminum industry. In particular, the disposal of waste cathodes has attracted the most attention. [0003] Around this issue, a lot of research has been done at home and abroad, and the treatment of waste cathodes can be summariz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02B09B3/00
CPCY02W30/20C01D3/02B09B3/00
Inventor 赵俊学赵忠宇张涛贾柏林尚南梁李斯施瑞盟
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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