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Method for comprehensively treating aluminum electrolytic cell spent pot linings

A technology of aluminum electrolytic cell and waste cell lining, which is applied in the direction of carbon preparation/purification, carbide, silicon carbide, etc., can solve the problems of high cost, non-recyclable, poor treatment effect, etc., to reduce the firing temperature and save Fuel and improvement of kiln productivity

Active Publication Date: 2018-02-23
平罗县中兴碳素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor treatment effect, pollution, non-recyclability, high cost and inability to truly realize comprehensive treatment of waste tank linings in the treatment process of the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the untreated waste cathode carbon block, the fluorine content (percentage by weight) is 7.12%, the cyanide content (leach solution content) is 23.77mg / L, and the ash content is 30.52%. After the waste is crushed and screened, the waste is crushed and ground into particles Form (0.3 ~ 0.5mm), mixed with 50% anthracite, put it into the heat treatment resistance furnace, adjust the atmosphere by introducing nitrogen, and control the pressure in the furnace at 0.05atm, after 2 hours of treatment at 1500 ° C, cool naturally, and waste In the cathode carbon block, the fluorine content (weight percentage) is less than 0.1%, cyanide is not detected, and the ash content (weight percentage) is 0.7%.

Embodiment 2

[0034]In the untreated silicon carbide waste side block, the fluorine content (weight percentage) is 2.31%, and the sodium content (weight percentage) is 2.51%. After high-temperature treatment for 2 hours, it is naturally cooled, and the contents of fluorine and sodium (percentage by weight) in the silicon carbide waste side block after treatment are both less than 0.01%.

Embodiment 3

[0036] Untreated waste refractory materials are mixed in proportion. Before treatment, the fluorine content (weight percentage) is 2.74%, and the sodium content (weight percentage) is 2.89%. The ratio is mixed with the raw materials for cement production. After mixing, the fluorine content of the kiln material is 0.27%, and the sodium content is 0.29%. It is placed in a cement kiln, and after 2 hours of high temperature treatment at 1450 ° C, it is naturally cooled in the air environment, and the processed cement is The clinker heavy metal content, fluorine content, sodium alkali content and compressive and flexural strength all meet the national standard of "General Portland Cement (GB175-2007)".

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PUM

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Abstract

The invention discloses a method for comprehensively treating aluminum electrolytic cell spent pot linings, and belongs to the technical field of aluminum electrolysis solid waste treatment. Spent potlinings produced during overhauling of aluminum electrolytic cells are classified and smashed according to waste negative electrode carbon blocks, silicon carbide side blocks and refractory materials(heat-insulating bricks, refractory bricks and anti-seepage materials), and different types of solid waste produced during overhauling of the electrolytic cells are treated with different methods. Toxicity restraining, burdening, pressure controlling and atmospheric high temperature treatment are performed on the waste negative electrode carbon blocks to realize removal of toxic and harmful substances and recycling of the waste negative electrode carbon blocks; high temperature thermal treatment is performed on the silicon carbide side blocks under normal pressure or controlled pressure in order to effectively remove fluorides and sodium salts and realize recycling of the silicon carbide side blocks; the waste refractory materials are put into a cement kiln together with raw materials forproducing cement in a certain mixture ratio for synergistic treatment by means of component calculation, so that various Portland cement clinkers can be prepared. By adopting the method, comprehensive treatment of the aluminum electrolytic cell spent pot linings as dangerous solid waste is realized, no harmful component is discharged in a treatment process, the solid waste is treated effectively,value added regeneration is realized, and the economical benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment in the aluminum electrolysis industry, and in particular relates to a green treatment and comprehensive utilization technology for comprehensively treating waste tank lining materials (cathode carbon blocks, silicon carbide side blocks, and refractory materials) in aluminum electrolysis. technical background [0002] my country's aluminum electrolysis production energy consumption has reached the world's leading level, but with the substantial increase in production scale, the amount of waste tank lining discharged after the overhaul of the electrolytic tank is also increasing year by year. The discharged waste tank lining is mainly composed of bottom cathode carbon block, side lining, refractory material and steel rod. These solid wastes contain harmful and valuable substances such as fluorine, cyanide, aluminum, sodium, and iron to varying degrees. At present, the waste tank lining...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/956C04B7/42
CPCC04B7/421
Inventor 刘风琴赵洪亮董文湘张拥军刘伟谢明壮
Owner 平罗县中兴碳素有限公司