Method for sorting waste aluminum electrolytic cathodes

An aluminum electrolysis and waste technology, which is applied in the comprehensive recycling and utilization of electrolytic aluminum waste cathodes, the separation and purification of electrolytic aluminum waste cathodes, can solve the problems affecting the selection index, the flotation index, and the large processing capacity, and achieves improved treatment. The effect of the effect, the production index is good, the production cost is low

Inactive Publication Date: 2015-03-25
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

[0005] (1) The flotation wastewater is directly discharged without treatment, causing environmental pollution
[0006] (2) There are a large number of ions in the pulp of flotation operation, which affects the selection index
[0007] Patent CN101480658A proposes to use flotation method to comprehensively treat waste cathodes, and use wet grinding to grind ore. The wastewater from grinding operation and flotation operation is concentrated and then processed. The wastewater treatment capacity is large, and the wastewater contains a large number of ions, which affects the flotation index; Hydrochloric acid or sulfuric acid is needed to adjust the pH of the pulp during the flotation process, which increases the cost

Method used

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  • Method for sorting waste aluminum electrolytic cathodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Utilization of waste cathodes in electrolytic aluminum production enterprises with an annual output of 200,000 tons of aluminum

[0029] (1) Basic information:

[0030] 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. The reference cathode composition is as follows: the carbon content is 33% to 65%, and the degree of graphitization is as high as 70% to 88%; the electrolyte composition content is 65% to 32%.

[0031] (2) Application method

[0032] After the collected waste cathodes are crushed and mixed, they are finely crushed and ground, and the waste cathodes are ground to less than 0.074mm, accounting for 70%.

[0033] Set up two dissolution pools (A and B pools) to operate alternately.

[0034] After ore grinding, the waste cathode powder is added to the dissoluti...

Embodiment 2

[0042] Example 2: Application of electrolytic aluminum enterprises with an annual output of 600,000 tons

[0043] (1) Basic information

[0044] 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 reference cathode composition is as follows: the carbon content is 42-69%, the degree of graphitization is as high as 70-88%; the electrolyte composition content is 58-31%.

[0045] (2) Application method

[0046] Crushing equipment is used for crushing treatment, mining equipment is used for grinding treatment, and the waste cathode is ground to less than 0.074mm, accounting for 85%.

[0047] Set up two dissolution pools (A and B pools) to operate alternately. After grinding, the waste cathode powder is added to the dissolution tank A for dissolution treatment, the dissolution concen...

Embodiment 3

[0055] Embodiment 3: Application of an industrial park with an annual output of 1 million tons of electrolytic aluminum

[0056] (1) Basic information

[0057]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 reference cathode composition is as follows: carbon content is 38-67%, graphitization degree is as high as 70-88%; electrolyte component content is 62'33%.

[0058] (2) Application method

[0059] Crushing equipment is used for crushing treatment, mining equipment is used for grinding treatment, and 90% of the waste cathodes are ground to below 0.074mm.

[0060] Set up two dissolution pools (A and B pools) to operate alternately.

[0061] After grinding, the waste cathode powder is added to the dissolution tank A for dissolution treatment, the dissol...

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Abstract

The invention relates to a method for sorting waste aluminum electrolytic cathodes. The method comprises the steps of carrying out crushing and blending treatment on sorted waste cathodes to obtain waste cathode fragments; grinding the waste cathode fragments to obtain crushed ores; soaking the crushed ores with water, and then carrying out solid-liquid separation to obtain dissolved ore bodies; and carrying out flotation treatment on the dissolved ore bodies to obtain carbon products and electrolyte products respectively. According to the method, a way of crushing, blending and then ore grinding is adopted for the waste cathodes, so that the uniformity of composition and the like of treated materials can be guaranteed, thus being beneficial to the improvement of a treatment effect; meanwhile, dissolution treatment is adopted for the ground waste cathode materials simultaneously, soluble parts are dissolved and separated to eliminate the impact of the soluble parts on subsequent flotation operation, and flotation can be carried out on the waste cathode materials directly after the dissolution treatment without adjusting the PH. The method for comprehensively recycling waste aluminum electrolytic cathodes, provided by the invention, is simple and feasible, low in production cost and good in production index.

Description

technical field [0001] The invention relates to the technical field of comprehensive recycling and environmental protection of waste electrolytic aluminum cathodes, and relates to a method for separating and purifying waste electrolytic aluminum cathodes, which is suitable for comprehensive recycling and utilization of waste electrolytic aluminum cathodes. technical background [0002] In the process of aluminum electrolysis, 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. The waste cathode generated during the overhaul process is one of the main solid wastes generated by the aluminum industry. . According to reports, for every ton of aluminum produced, about 30-50kg of waste cathodes are produced. With the increase of aluminum production year by year, a large amount of waste cathodes are produced in my country every year. Taking 2013 as an example, the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00B03D1/00
Inventor 赵俊学张涛贾柏林张崇辉胡晓滨施瑞盟唐雯聃方钊刘铁中
Owner 北京森泉伟业科技有限公司
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