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High-temperature vacuum treatment method and device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks and operation method of high-temperature vacuum treatment device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks

A silicon carbide brick, high temperature vacuum technology is applied in the high temperature vacuum treatment of carbon slag or silicon carbide bricks, and the field of aluminum electrolysis waste cathodes. Guaranteed handling results, fast loading and unloading

Inactive Publication Date: 2020-12-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment methods of overhaul slag mainly focus on harmless treatment, including wet method, fire method, and acid method; among them, wet method has been put into use, mainly used to deal with refractory waste of waste tank lining, etc., cathodes, carbon slag, etc. Materials with comprehensive utilization value are yet to be studied
For example, flotation and acid-base leaching are expected to achieve harmless treatment and comprehensive utilization, but they have not been widely used due to complex processes and unsatisfactory results.

Method used

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  • High-temperature vacuum treatment method and device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks and operation method of high-temperature vacuum treatment device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks
  • High-temperature vacuum treatment method and device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks and operation method of high-temperature vacuum treatment device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks
  • High-temperature vacuum treatment method and device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks and operation method of high-temperature vacuum treatment device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 Utilization of waste cathodes in electrolytic aluminum production enterprises with an annual output of 200,000 tons of aluminum

[0068] (1) Basic information:

[0069] 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 6,000 tons, and another 20,000 tons are stockpiled and need to be disposed of urgently.

[0070] The reference cathode composition is as follows: the carbon content is 58%-72%, and the degree of graphitization is as high as 70%-88%; the electrolyte composition content is 42%-28%.

[0071] (2) Application method

[0072] according to figure 1 The process shown and figure 2 The equipment shown is connected to build a vacuum high-temperature volatilization device to dispose of waste cathodes. After the waste cathodes are sorted, use a jaw crusher for coarse and medium cr...

Embodiment 2

[0080] Example 2 Application of electrolytic aluminum enterprises with an annual output of 600,000 tons

[0081] (1) Basic information

[0082] 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 carbon slag is 2,500 tons, the carbon content is 60% to 65%, and the electrolyte component content is 40% to 35%; the annual waste cathode production is 8,000 tons. The reference cathode composition is as follows: the carbon content is 62%-69%, and the electrolyte composition content is 38%-31%.

[0083] (2) Application method

[0084] according to figure 1 The process shown and figure 2 The shown equipment is connected to build a vacuum high-temperature volatilization device to dispose of carbon slag and waste cathodes.

[0085] After the waste cathodes are sorted, use the jaw crusher for coarse crushing and the hammer crusher ...

Embodiment 3

[0093] Example 3 Application of an industrial park with an annual output of 1 million tons of electrolytic aluminum

[0094] (1) Basic information

[0095] Aluminum Industrial Park, with an annual electrolytic aluminum production capacity of 1 million tons. Use 200 ~ 350kA large prebaked tank electrolysis. The output of waste cathodes is 12,000 tons / a, carbon slag is 8,000 tons / a, and waste silicon carbide bricks is 800 tons. Waste cathodes and carbon slag are treated by sorting. After sorting, the output of carbonaceous materials is 12,000 tons, with a carbon content of 78% to 85%. It is necessary to further remove the electrolyte and increase the carbon content. Silicon carbide bricks also hope to do this treatment. It is transformed into general solid waste and returned to the batching to make bricks.

[0096] (2) Application method

[0097] according to figure 1 The process shown and figure 2 The equipment shown is connected to build a vacuum high-temperature volati...

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Abstract

The invention discloses a high-temperature vacuum treatment method and device for aluminum electrolysis waste cathodes, carbon residues or silicon carbide bricks and an operation method of the high-temperature vacuum treatment device for the aluminum electrolysis waste cathodes, the carbon residues or the silicon carbide bricks. The method comprises the following steps that 1, a to-be-treated material is subjected to crushing and blending treatment, and a treated material is obtained; 2, the treated material obtained in the step 1 is heated to a preset temperature, a preset duration is maintained in a vacuum environment, so that volatile matters in the material are fully volatilized, and harmful substances are decomposed and converted; and 3, a product converted into general solid waste isdischarged, and the volatile matters are condensed and collected. The method can be used for realizing harmless treatment and utilization of the waste cathodes, the carbon residues and the silicon carbide bricks, and no wastewater, harmful waste gas or new waste is generated in the treatment process.

Description

technical field [0001] The invention belongs to the field of harmless treatment, comprehensive recycling and environmental protection of aluminum electrolysis waste cathodes, carbon slag and silicon carbide bricks, in particular to a high-temperature vacuum treatment method and treatment of aluminum electrolysis waste cathodes, carbon slag or silicon carbide bricks Device and method of operation thereof. Background technique [0002] The main equipment for electrolytic aluminum production is the aluminum electrolytic cell. During the aluminum electrolytic production process, the carbon cathode is swollen and scrapped due to the penetration of impurities such as fluorine and sodium. It needs to be overhauled and replaced every 3 to 5 years, and a large amount of solid waste is produced— — Collectively referred to as overhaul slag. Overhaul slag is a typical hazardous solid waste discharged from the production process of electrolytic aluminum, and the total annual discharge i...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00B09B3/40
Inventor 赵俊学辛鑫任萌萌胡爱琳贾柏林王泽屈波樵
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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