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Comprehensive utilization method of aluminum electrolytic waste cathode materials

A cathode material, aluminum electrolysis technology, applied in the fields of metallurgy and environmental protection, can solve the problems of unsatisfactory separation effect, insufficient carbonaceous material and electrolyte purity, no secondary pollution, obvious economic and social benefits, and simple and easy process row effect

Active Publication Date: 2015-12-09
北京森泉伟业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current separation effect is not ideal, and the purity of the obtained carbonaceous materials and electrolytes is not high enough. How to effectively realize comprehensive utilization needs further research

Method used

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  • Comprehensive utilization method of aluminum electrolytic waste cathode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Application of electrolytic aluminum production plant with annual production capacity of 200,000 tons

[0045] (1) Basic situation:

[0046] The electrolytic aluminum plant with an annual production capacity of 200,000 tons adopts 300kA large-scale pre-baked cell electrolysis technology and pre-baked anode baking technology. Annual waste cathode production is 8,000 tons. The reference cathode composition is as follows: the carbon content is 33-65% (wherein, the graphitization degree of the cathode residue carbon is as high as 70-88%); the electrolyte composition content is 65-32%.

[0047] (2) Application method

[0048] In the process of dismantling the electrolytic cell, first clean up the electrolyte layer at the bottom of the electrolytic cell. You can see about 50mm below the carbon cathode material. The transition layer of electrolyte and cathode material is transported to the sorting workshop, and the cathode is removed. The debris is transported to the pro...

Embodiment 2

[0053] Example 2: Application of electrolytic aluminum enterprises with an annual output of 600,000 tons

[0054] (1) Basic situation

[0055] The electrolytic aluminum plant with an annual production capacity of 600,000 tons adopts 300kA large-scale pre-baked cell electrolysis technology and pre-baked anode baking technology. The annual waste cathode production is 20000-24000 tons. The reference cathode composition is as follows: the carbon content is 42-69%, the graphitization degree of the cathode residue is as high as 70-88%; the electrolyte composition content is 58-31%.

[0056] (2) Application method

[0057] In the process of dismantling the electrolytic cell, first clean up the electrolyte layer at the bottom of the waste cell. You can see about 50mm below the carbon cathode material. The transition layer of electrolyte and cathode material is transported to the sorting workshop to remove the cathode residue. The blocks are transported to the processing workshop. Manual s...

Embodiment 3

[0062] Example 3: Application in an industrial park with an annual output of 1 million tons of electrolytic aluminum

[0063] (1) Basic situation

[0064] The aluminum industry park has an annual electrolytic aluminum production capacity of 1 million tons. Using 200-350kA large-scale pre-baked cell electrolysis technology and pre-baked anode baking technology. The annual production of waste cathodes is 38,000-46,000 tons. The composition of the reference cathode residue is as follows: the carbon content is 38-67%, the graphitization degree is as high as 70-88%; the electrolyte component content is 62-33%.

[0065] (2) Application method

[0066] In the process of dismantling the electrolytic cell, first clean up the electrolyte layer at the bottom of the waste cell. You can see about 50mm below the carbon cathode material. The transition layer of electrolyte and cathode material is transported to the sorting workshop to remove the cathode residue. The blocks are transported to th...

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Abstract

The invention discloses a comprehensive utilization method of aluminum electrolytic waste cathode materials and relates to the field of metallurgy and environmental protection. The method includes the steps that firstly, an aluminum electrolysis cell is detached, and electrolyte layer materials are recycled; transition layer materials of an electrolyte layer and cathode fragments are conveyed to a sorting workshop; the cathode fragments are conveyed to a processing workshop for crushing, and even mixing is conducted through flatly laying, straightly taking and other modes; the crushed particles are screened, the particles with the grain size over 10 mm are crushed continuously, the particles with the grain size below 3 mm are further ground till the grain size is below 0.074 mm, and cathode carbon powder is obtained; the particles with the grain size ranging from 3 mm to 10 mm serve as steel carbon; the cathode carbon powder with the grain size below 0.074 mm serve as protecting slag additives and used for controlling the melting speed of the protecting slag. By means of the comprehensive utilization method, waste anodes can be directly utilized in ferrous metallurgy, wastes generated in the aluminum electrolytic industry can become raw materials for production of auxiliary materials of ferrous metallurgy, and the concept of ecological metallurgy is achieved, and the method is easy to implement and free of secondary pollution.

Description

Technical field [0001] The invention relates to the field of metallurgy and environmental protection, and relates to a comprehensive utilization method of aluminum electrolysis waste cathode materials. The method is suitable for the treatment and utilization of waste cathodes (including carbonaceous materials such as carbon slag) in the aluminum electrolysis industry. Background technique [0002] The main equipment for electrolytic aluminum production is an aluminum electrolytic cell. After a period of use of the aluminum electrolytic cell, the cathode material is scrapped due to the erosion of the electrolyte and must be replaced. This will produce a large amount of waste cathode materials every year. [0003] my country's electrolytic aluminum industry has developed rapidly. Since 2001, the output of electrolytic aluminum has remained the world's largest for 13 consecutive years. In 2013, the output reached 21.95 million tons. It is roughly estimated that the discharged cathodes...

Claims

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Application Information

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IPC IPC(8): C25C3/06C25C3/08
Inventor 赵俊学贾柏林胡晓滨刘铁中张涛施瑞盟唐雯聃鲍龙飞方钊张崇辉
Owner 北京森泉伟业科技有限公司
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