Comprehensive resource recycling method for waste cathode carbon blocks of aluminum cells

A technology of aluminum electrolytic cell waste and cathode carbon blocks, which is applied in the field of comprehensive utilization of solid waste resources, can solve the problems of ineffective recycling of valuable substances, high processing costs, and complicated processes, and achieve low raw material prices, high purity, and simple processes Effect

Active Publication Date: 2016-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, there are many recovery and treatment processes for waste cathode carbon blocks in aluminum electrolysis, most of which have not been widely industrialized due to complex processes, serious equipment corrosion, ineffective recovery of valuable substances, and high processing costs.

Method used

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  • Comprehensive resource recycling method for waste cathode carbon blocks of aluminum cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take 10g of the waste cathode carbon block of a domestic aluminum electrolytic cell, the main element content is (wt%): C70.9, Al8.23, O9.55, F5.38, Na2.57, Fe1.21, crush and grind to -200 mesh accounted for 90%, laid flat in a 9cm×6cm flat-bottomed square porcelain boat.

[0050] Put the porcelain boat containing the waste cathode powder in a muffle furnace, heat it to 400℃ and keep it for 30 minutes; the cyanide-removing waste cathode powder is mixed with water at a mass concentration of 25% to form a slurry, which is carried out by a single tank flotation machine Rough selection. The flotation inhibitor is water glass with a dosage of 320g / t waste cathode; the collector is kerosene with a dosage of 400g / t waste cathode; the foaming agent is No. 2 oil with a dosage of 40g / t waste cathode. The flotation foam and the underflow were washed with water and then dried and weighed. The obtained carbon residue and electrolyte residue were 7.35g and 2.46g, respectively.

[0051] ...

Embodiment 2

[0055] Take 30g of the waste cathode carbon block of an aluminum electrolytic cell in a domestic factory, the content of main elements is (wt%): C70.9, Al8.23, O9.55, F5.38, Na2.57, Fe1.21, crush and grind to -200 mesh accounted for 80%, laid flat in a 12cm×8cm flat-bottomed square porcelain boat.

[0056] Put the porcelain boat containing the waste cathode powder in a muffle furnace, heat it to 400℃ and keep it for 10 minutes; the cyanide-removing waste cathode powder is mixed with water at a mass concentration of 10% to form a slurry, which is carried out by a single tank flotation machine Rough selection. The flotation inhibitor is water glass with a dosage of 200g / t waste cathode; the collector is kerosene with a dosage of 600g / t waste cathode; the foaming agent is No. 2 oil with a dosage of 20g / t waste cathode. The flotation foam and the underflow were washed with water and then dried and weighed. The obtained carbon residue and electrolyte residue were 23.64g and 6.14g, re...

Embodiment 3

[0061] Take 100g of the waste cathode carbon block of an aluminum electrolytic cell in a domestic factory, and the main element content is (wt%): C70.9, Al8.23, O9.55, F5.38, Na2.57, Fe1.21, and crush the ink to -200 mesh accounted for 60%, laid flat in a square porcelain boat with a flat bottom of 12cm×8cm.

[0062] Put the porcelain boat containing the waste cathode powder in the muffle furnace, heat it to 300℃ and keep it for 60 minutes; the cyanide-removing waste cathode powder is mixed with water at a mass concentration of 30% to form a slurry, which is carried out by a single tank flotation machine Rough selection. The flotation inhibitor is water glass with a dosage of 320g / t waste cathode; the collector is kerosene with a dosage of 200g / t waste cathode; the foaming agent is No. 2 oil with a dosage of 100g / t waste cathode. The flotation foam and underflow were washed with water and then dried and weighed. The obtained carbon residue and electrolyte residue were 80.51g and...

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Abstract

The invention relates to a comprehensive resource recycling method for waste cathode carbon blocks of aluminum cells and belongs to the technical field of comprehensive utilization of waste solid resources. The method includes the steps that the waste cathode carbon blocks of the aluminum cells are broken, so that spare particles are obtained; the particles are heated to the temperature of 200-400 DEG C, and flotation is carried out after the temperature is preserved, so that carbon slag and electrolyte slag are obtained; the electrolyte slag is heated to the temperature of 550-800 DEG C, the temperature is preserved, and then electrolyte powder is obtained; the carbon slag is added into alkali liquor for leaching, filtering is carried out after leaching, and filter residues and filtrate are obtained; the obtained filtrate is heated to the temperature of 60-90 DEG C and then subjected to evaporative crystallization, a solid A is separated out, filtering is carried out, and the solid A and residual fluid are obtained; and aluminum hydroxide seeds are added into the residual fluid, the mixture is heated to the temperature of 25-60 DEG C, the temperature is preserved, filtering is obtained, and a solid B and tail fluid are obtained. The method is reasonable in technical design, high in processing efficiency, high in matter recovery rate and recycling utilization ratio, free of secondary pollution and suitable for large-scale industrial application.

Description

Technical field [0001] The invention relates to a comprehensive recycling treatment method for the resource utilization of waste cathode carbon blocks of an aluminum electrolytic cell, and belongs to the technical field of comprehensive utilization of solid waste resources. technical background [0002] Since 2001, China's electrolytic aluminum production capacity has ranked first in the world for many consecutive years. In 2015, the output of primary aluminum was approximately 31.41 million tons. The current aluminum electrolysis adopts the Hall-Elu process. During the production process, the electrolyte infiltration, high-temperature aluminum liquid and metal sodium erodes the bottom of the cell, which causes the aluminum electrolysis cell to stop and replace the lining after 3-6 years of operation. . Studies have shown that for every 1 ton of electrolytic aluminum produced, about 10 kg of waste cathode materials are produced. Based on this calculation, my country produced mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C25C3/12
CPCB09B3/00C25C3/12
Inventor 肖劲袁杰田忠良杨凯余柏烈赖延清李劼
Owner CENT SOUTH UNIV
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