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Method for performing ultrasonic alkaline leaching and microwave digestion combined treatment on electrolytic aluminum waste cathode carbon block

A waste cathode carbon block and microwave digestion technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem that the environmental pollution of electrolytic aluminum waste cathode carbon block has not been effectively solved, the product added value is low, and the processing cost is high. problems, to achieve significant environmental benefits and economic benefits, improve microwave digestion efficiency, and reduce energy consumption.

Inactive Publication Date: 2018-04-13
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although there are many recovery and treatment processes for aluminum electrolysis waste cathode carbon blocks, most of them have not been widely used in industrial applications, mainly because these processes have some disadvantages, such as high processing costs, complex processes, serious equipment corrosion, and product added value. Low, high pressure on environmental protection, high energy consumption, etc.
Therefore, domestic electrolytic aluminum waste cathode carbon blocks are mainly landfilled or stockpiled, and the environmental pollution problem of electrolytic aluminum waste cathode carbon blocks has not been effectively resolved.

Method used

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  • Method for performing ultrasonic alkaline leaching and microwave digestion combined treatment on electrolytic aluminum waste cathode carbon block

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Experimental program
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Effect test

Embodiment 1

[0034] A method for combined treatment of electrolytic aluminum waste cathode carbon blocks by ultrasonic alkaline leaching and microwave digestion, the process flow of the method is as follows figure 1 As shown, the details are as follows:

[0035] (1) Crushing and grinding: First, the electrolytic aluminum waste cathode carbon block is crushed to a particle size of 2 cm, and then the electrolytic aluminum waste cathode carbon block with a particle size of 2 cm is ground into waste cathode carbon powder, waste cathode carbon The particle size in the powder is 0.075mm and accounts for 80wt%;

[0036] (2) Ultrasonic alkaline leaching: first add the waste cathode carbon powder obtained in step (1) into a sodium hydroxide solution with a mass fraction of 5% according to the mass volume ratio of 1:5 to obtain an alkaline slurry, and then the alkaline The slurry was ultrasonically treated at an ultrasonic frequency of 80kHz, a power of 400W, and a temperature of 30°C for 60 minute...

Embodiment 2

[0041] A method for combined treatment of electrolytic aluminum waste cathode carbon blocks by ultrasonic alkaline leaching and microwave digestion, the process flow of the method is as follows figure 1 As shown, the details are as follows:

[0042] (1) Crushing and grinding: First, the electrolytic aluminum waste cathode carbon block is crushed to a particle size of 2 cm, and then the electrolytic aluminum waste cathode carbon block with a particle size of 2 cm is ground into waste cathode carbon powder, waste cathode carbon The particle size in the powder is 0.075mm and accounts for 90wt%;

[0043] (2) Ultrasonic alkaline leaching: first add the spent cathode carbon powder obtained in step (1) into a sodium hydroxide solution with a mass fraction of 10% according to the mass-volume ratio of 1:5 to obtain an alkaline slurry, and then the alkaline The slurry was ultrasonically treated at an ultrasonic frequency of 40kHz, a power of 300W, and a temperature of 60°C for 30 minut...

Embodiment 3

[0048] A method for combined treatment of electrolytic aluminum waste cathode carbon blocks by ultrasonic alkaline leaching and microwave digestion, the process flow of the method is as follows figure 1 As shown, the details are as follows:

[0049] (1) Crushing and grinding: First, the electrolytic aluminum waste cathode carbon block is crushed to a particle size of 2 cm, and then the electrolytic aluminum waste cathode carbon block with a particle size of 2 cm is ground into waste cathode carbon powder, waste cathode carbon The particle size in the powder is 0.15mm and accounts for 80wt%;

[0050] (2) Ultrasonic alkaline leaching: first add the spent cathode carbon powder obtained in step (1) into a sodium hydroxide solution with a mass fraction of 10% according to the mass-volume ratio of 1:5 to obtain an alkaline slurry, and then the alkaline The slurry was ultrasonically treated at an ultrasonic frequency of 27kHz, a power of 500W, and a temperature of 80°C for 120 minut...

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Abstract

The invention relates to a method for performing ultrasonic alkaline leaching and microwave digestion combined treatment on an electrolytic aluminum waste cathode carbon block, and belongs to the technical field of comprehensive utilization of aluminum electrolysis solid waste resources. The method comprises three processes of crushing and grinding, performing ultrasonic alkaline leaching and performing microwave digestion, the ultrasonic alkaline leaching and the microwave digestion are subjected to combined utilization and are synergistic, a carbon material and fluoride are separated and recycled in an efficient and environment-friendly mode, environmental harm is reduced, remarkable environment-protecting benefit and economic benefit are achieved, harmless treatment and resource utilization of the electrolytic aluminum waste cathode carbon block are realized, and the method is a low-energy-consumption, high-efficiency and high-additional-value process technology for performing harmless treatment and resource utilization on the electrolytic aluminum waste cathode carbon block.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of aluminum electrolytic solid waste resources, and in particular relates to a method for combined treatment of electrolytic aluminum waste cathode carbon blocks by ultrasonic alkaline leaching and microwave digestion. Background technique [0002] During the production process of aluminum electrolysis, the high-temperature electrolyte penetrates and corrodes the lining material, causing deformation and cracking of the lining structure of the electrolytic cell, and the aluminum liquid and electrolyte in the electrolytic cell leak out from the cracks. Generally, the electrolytic cell will be used for 5 to 6 years. If it is necessary to stop the tank for overhaul, all the waste lining materials taken out are called overhaul slag for short. The overhaul slag mainly includes cathode carbon blocks, cathode paste, refractory bricks, insulation bricks, anti-seepage materials and insulati...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B9/08
CPCC01B9/08
Inventor 冉少念刘显彬马灵菊张建刚周林吴涛段明华平原
Owner CHONGQING YUANDA CATALYST MFG
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