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A treating method of waste cathode charcoal blocks

A technology of waste cathode carbon block and treatment method, which is applied in the direction of solid waste removal, etc., can solve the problems of large capital, operation and management costs, occupation of large land, etc., so as to achieve low production and operation costs, eliminate pollution, and realize comprehensive utilization and resources. effect of chemical utilization

Inactive Publication Date: 2016-11-30
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vast majority of electrolytic aluminum factories have not effectively processed and utilized the overhaul slag, and mainly used storage or landfill methods for disposal, which not only occupied a lot of land, invested a lot of money and operation management costs, but also caused pollution in the long run Hidden danger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Sorting and crushing: Sorting the slag from the overhaul of the electrolytic cell, crushing the sorted waste cathode carbon blocks with a ball mill to obtain powdery waste cathode carbon blocks; among them, the powdery waste cathode carbon blocks with a particle size of less than 180 μm The block has 91.4%.

[0028] (2) Water leaching: the first leaching: after mixing the spent cathode carbon blocks and water at a mass ratio of 1:3, leaching at 80°C for 2.0 hours, filtering and separating the filter cake for a second leaching, and measuring The fluoride ion concentration in the filtrate is 14825mg / L; the second leaching: after the first leaching, the waste cathode carbon block and water are mixed according to the mass ratio of 1:4, and then leached at 90°C for 2.0h, filtered and separated The filter cake was leached three times, and the fluoride ion concentration in the filtrate was measured to be 426 mg / L; the third leaching: after the second leaching, the waste ca...

Embodiment 2

[0032] (1) Sorting and crushing: Sorting the slag from the overhaul of the electrolytic cell, crushing the sorted waste cathode carbon blocks with a ball mill to obtain powdery waste cathode carbon blocks; among them, the powdery waste cathode carbon blocks with a particle size of less than 180 μm The block has 94.4%.

[0033] (2) Water leaching: the first leaching: after mixing the waste cathode carbon blocks and water at a mass ratio of 1:4, leaching at 60°C for 3.0 hours, filtering and separating the filter cake for a second leaching, and measuring The fluoride ion concentration in the filtrate is 13879mg / L; the second leaching: after the first leaching, the waste cathode carbon block and water are mixed according to the mass ratio of 1:6, and then leached at 80°C for 2.0h, filtered and separated The filter cake was leached three times, and the fluoride ion concentration in the filtrate was measured to be 386mg / L; the third leaching: after the second leaching, the waste cat...

Embodiment 3

[0037] (1) Sorting and crushing: Sorting the slag from the overhaul of the electrolytic cell, crushing the sorted waste cathode carbon blocks with a ball mill to obtain powdery waste cathode carbon blocks; among them, the powdery waste cathode carbon blocks with a particle size of less than 180 μm The block has 92.5%.

[0038] (2) Water leaching: the first leaching: after mixing the waste cathode carbon blocks and water at a mass ratio of 1:5, leaching at 90°C for 1.0h, filtering and separating the filter cake for a second leaching, and measuring The fluoride ion concentration in the filtrate is 12247mg / L; the second leaching: after the first leaching, the waste cathode carbon block and water are mixed according to the mass ratio of 1:5, and then leached at 90°C for 1.0h, and then separated by filtration The filter cake was leached three times, and the fluoride ion concentration in the filtrate was measured to be 512 mg / L; the third leaching: after the second leaching, the was...

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Abstract

A treating method of waste cathode charcoal blocks is provided. The waste cathode charcoal blocks are from electrolytic tank heavy maintenance slag of an electrolytic aluminium factory. The method includes treating the electrolytic tank heavy maintenance slag to obtain powdered waste cathode charcoal blocks, subjecting the powdered waste cathode charcoal blocks to water leaching to obtain a leachate and cathode charcoal blocks after leaching, performing solid liquid separation after the leachate and a fluorine removal agent are subjected to a curing reaction, returning the filtrate to the leaching step for circulated use, and stacking filter cakes or adopting the filter cakes as a raw material for preparing calcium fluoride. The method adopts a manner of a plurality of times of leaching, thus achieving innocent treatment of the waste cathode charcoal blocks. The filtrate and the filter cakes after leachate treatment can be reused, and the cathode charcoal blocks after leaching can be adopted as fuel for producing alumina. The method overcomes a series of problems caused by stacking of a large amount of the waste cathode charcoal blocks, achieves efficient utilization of the waste cathode charcoal blocks, and is obvious in economic benefit and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for treating waste cathode carbon blocks, the waste cathode carbon blocks are from electrolytic cell overhaul slag of an electrolytic aluminum plant. Background technique [0002] The electrolytic cell of the electrolytic aluminum factory is the core equipment for the production of electrolytic aluminum. Under normal production conditions, the life of the electrolytic cell is generally about 1800 days. Carbon blocks, waste refractory bricks, paste, waste insulation bricks, waste insulation materials, etc. are collectively referred to as electrolytic cell overhaul slag. Because electrolytic cell overhaul slag is immersed in fluoride and a small amount of cyanide during high-temperature production, it is classified as hazardous solid waste according to the National Hazardous Waste Identification Standard Leaching Toxicity Identification issued in 2007 (GB5085.3-2007). [0003] At present, the national electrolytic alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C25C3/08C10L5/48
CPCB09B3/00C10L5/48C25C3/08
Inventor 洪景南杨会宾孙俊民孙振斌王娜高志军陈婕胡剑许学斌
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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