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Method for recycling carbon from aluminum electrolytic waste cathode through ultrasonic-assisted pressure acid leaching

An aluminum electrolytic cell waste and ultrasonic technology, applied in the removal of solid waste, etc., can solve the problems of high environmental protection pressure, serious equipment corrosion, complex process, etc., and achieve the effects of accelerating the reaction speed, improving the effect of acid leaching, and shortening the reaction time

Active Publication Date: 2016-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there are not many recovery and treatment processes for aluminum electrolysis waste cathode carbon blocks that are suitable for industrial applications, and the existing drawbacks also restrict the further promotion of the process. These drawbacks mainly include complex processes, serious corrosion of equipment, and inability to effectively recycle valuable substances. , high processing costs, high pressure on environmental protection, high energy consumption, low efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured main element contents are (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.

[0037] step one

[0038] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;

[0039] step two

[0040] The spare powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 2:1, and the slurry is treated in an ultrasonic wave for 15 minutes, with an ultrasonic frequency of 40KHz and a power of 200W;

[0041] step three

[0042] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 8:1 2 SO 4 In the lye with a concentration of 2mol / L, the acid leaching process was carried out in an autoclave under pressure, with a constant temperature of 180°C, a stirring speed of 600rpm, and a reaction time of 45min. After fil...

Embodiment 2

[0067] Take 20g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured main element contents are (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.

[0068] step one

[0069] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;

[0070] step two

[0071] The standby powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 2:1, and the slurry is treated in an ultrasonic wave for 20 minutes, with an ultrasonic frequency of 40KHz and a power of 200W;

[0072] step three

[0073] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 10:1 2 SO 4 In the lye with a concentration of 3mol / L, the acid leaching process was carried out under pressure in an autoclave, with a constant temperature of 180°C, a stirring speed of 800rpm, and a reaction time of 90min. After ...

Embodiment 3

[0078] Take 30g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured content of main elements is (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.

[0079] step one

[0080] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;

[0081] step two

[0082] The spare powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 1:1, and the slurry is treated in an ultrasonic wave for 15 minutes, with an ultrasonic frequency of 25KHz and a power of 200W;

[0083] step three

[0084] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 5:1 2 SO 4 In the lye with a concentration of 1mol / L, the acid leaching process was carried out under pressure in an autoclave, with a constant temperature of 100°C, a stirring speed of 800rpm, and a reaction time of 180min. After ...

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Abstract

The invention relates to a method for recycling carbon from an aluminum electrolytic waste cathode through ultrasonic-assisted pressure acid leaching and belongs to the technical field of aluminum electrolytic solid waste recycling. The method comprises the steps that after a carbon block of the aluminum electrolytic waste cathode is crushed, ultrasonic pretreatment is conducted, pretreated powder is added into an acid leaching solution for pressure leaching, carbon and filtrate are obtained through filtering, the filtrate is subjected to evaporative crystallization, and mixed powder of sodium salt and aluminum salt is separated out. According to the method, under the synergistic effect of ultrasonic pretreatment and pressure acid leaching, efficient, clean and high-purity recovery of precious matter in the carbon block of the aluminum electrolytic waste cathode is achieved. The technique is simple, operation is convenient, the reaction speed is high, secondary pollution is not generated, and the method is suitable for large-scale treatment of the carbon blocks of the aluminum electrolytic waste cathodes. The whole carbon recovery technological time is 60 min, the carbon recovery rate is 95.74%, and the purity of carbon powder is 97.42%.

Description

technical field [0001] The invention relates to a method for recovering carbon from aluminum electrolysis waste cathodes by ultrasonic-assisted pressurized acid leaching, and belongs to the technical field of aluminum electrolysis solid waste recovery. Background technique [0002] Aluminum is the most abundant metal element in the earth's crust, and it is also an important basic raw material that plays a supporting role in the national economy. At present, primary aluminum production mainly adopts the Hall-Elu electrolysis process. In the production process, the new electrolytic cell needs to be shut down for overhaul after 3 to 6 years of use. The waste cathode carbon block produced is the most important solid waste in the aluminum electrolysis production process. . Studies have shown that about 10kg of waste cathode materials will be produced for every ton of primary aluminum produced by electrolysis. In 2015, China's waste cathode emissions exceeded 300,000 tons. [0...

Claims

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Application Information

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IPC IPC(8): B09B3/00C25C3/12
CPCB09B3/00C25C3/125
Inventor 肖劲袁杰田忠良杨凯黄金堤仲奇凡余柏烈赖延清李劼
Owner CENT SOUTH UNIV
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