Ultrasonic-assisted alkaline pickling treatment method of aluminum electrolysis spent cathode carbon blocks

A technology of waste cathode carbon block and ultrasonic wave, applied in the direction of solid waste removal, etc., can solve the problems of technical and economic benefit constraints, less process, etc.

Active Publication Date: 2016-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] There are many treatment methods for aluminum electrolysis waste tank lining, but due to the constraints of its technology and economic benefits, there are few processes applied to large-scale industrial treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 60.9, Al12.23, O 9.55, F 5.38, Na 4.57, crushed to -200 mesh, accounting for 90%, according to liquid-solid Add the crushed powder into the alkali solution with NaOH concentration of 2mol / L at a ratio of 8:1. The alkali leaching process is carried out in an ultrasonic environment, with a constant temperature of 90°C, a stirring speed of 700rpm, an alkali leaching time of 60min, an ultrasonic frequency of 40KHz, a power of 200W, and an ultrasonic The processing time was 30 minutes; the charcoal powder and the filtrate were obtained by filtration, and 6.22 g of charcoal powder with a purity of 97.89% were obtained after drying.

[0031] Alkali leaching filtrate is fed into CO at 25L / h 2 gas, ventilated for 10 minutes, filtered to obtain electrolyte powder, and the filtrate was reused.

[0032] The whole process cycle is 70 minutes (not in...

Embodiment 2

[0038] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 60.9, Al12.23, O 9.55, F 5.38, Na 4.57, crushed to -200 mesh, accounting for 50%, according to liquid-solid Add the crushed powder into the alkali solution with NaOH concentration of 3mol / L at a ratio of 10:1. The alkali leaching process is carried out in an ultrasonic environment with a constant temperature of 100°C, a stirring speed of 700rpm, an alkali leaching time of 90min, an ultrasonic frequency of 40KHz, a power of 50W, and an ultrasonic The processing time was 50 minutes; carbon powder and filtrate were obtained by filtration, and 6.26 g of carbon powder with a purity of 97.31% were obtained after drying.

[0039] Alkali leaching filtrate is fed into CO at 50L / h2 gas, ventilated for 12 minutes, filtered to obtain electrolyte powder, and the filtrate was reused.

[0040] The whole process cycle is 100min (not including the proces...

Embodiment 3

[0042] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 60.9, Al12.23, O 9.55, F 5.38, Na 4.57, crushed to -200 mesh, accounting for 90%, according to liquid-solid Add the crushed powder into the alkali solution with NaOH concentration of 5mol / L at a ratio of 8:1. The alkali leaching process is carried out in an ultrasonic environment with a constant temperature of 90°C, a stirring speed of 1000rpm, an alkali leaching time of 180min, an ultrasonic frequency of 25KHz, a power of 600W, and an ultrasonic The processing time was 180 minutes; the charcoal powder and the filtrate were obtained by filtration, and 6.22 g of charcoal powder with a purity of 97.92% were obtained after drying.

[0043] Alkaline leaching filtrate is fed into CO at 5L / h 2 gas, ventilated for 30 minutes, filtered to obtain electrolyte powder, and the filtrate was reused.

[0044] The whole process cycle is 210min (not inc...

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Abstract

The invention relates to an ultrasonic-assisted alkaline pickling treatment method of aluminum electrolysis spent cathode carbon blocks. The ultrasonic-assisted alkaline pickling treatment method of the aluminum electrolysis spent cathode carbon blocks belongs to the technical field of aluminum electrolysis solid waste resource recovery, and comprises the following steps of smashing the aluminum electrolysis spent cathode carbon blocks, adding the aluminum electrolysis spent cathode carbon blocks into alkaline liquor for leaching, and filtering to obtain carbon powder and first filter liquor; carrying out alkaline pickling under the ultrasonic environment; leading CO2 into the first filter liquor, crystallizing out, filtering to obtain cryolite, an aluminum hydroxide mixture and second filter liquor, and recycling the second filter liquor. The ultrasonic-assisted alkaline pickling treatment method of the aluminum electrolysis spent cathode carbon blocks is simple in process, and convenient to operate; and through the synergistic effect of ultrasonic wave and alkaline pickling, the reaction rate is accelerated, the purity of the product carbon powder is improved, the maximum purity of the carbon powder is 97.92 percent, and the production cycle is 70min.

Description

technical field [0001] The invention relates to a method for treating waste and old cathode carbon blocks of aluminum electrolysis by ultrasonic-assisted alkali leaching, and belongs to the technical field of aluminum electrolysis solid waste resource recovery. Background technique [0002] The lining of the aluminum electrolytic cell is constructed in a steel frame and is composed of materials such as carbon, silicon carbide, refractory bricks, insulation bricks, and calcium silicate boards. During the production process, the lining of the tank is inevitably corroded by high-temperature electrolytes, liquid aluminum, sodium metal and other substances, resulting in deformation and rupture of the lining structure, and the liquid aluminum and electrolyte in the tank leaking from the cracks. Generally, a new electrolytic cell needs to be shut down for overhaul after 3 to 6 years of use, and the waste cell lining produced is the most important solid waste in the aluminum electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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