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Aluminum electrolysis waste slot lining hazard-free treatment method for carrying out wet strengthening for defluorination after heat treatment

A technology of waste tank lining and aluminum electrolysis, which is applied in the removal of solid waste and other directions, can solve the problems of difficult one-time solidification and conversion, high fluoride content, and achieve the effects of low cost, convenient operation and simple process.

Inactive Publication Date: 2016-04-06
BEIJING JINGBILAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main method of treating waste tank linings is incineration. Cyanide can be decomposed, but the content of fluoride is high, and it is difficult to solidify and transform at one time. The incineration residue still has certain environmental risks.

Method used

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  • Aluminum electrolysis waste slot lining hazard-free treatment method for carrying out wet strengthening for defluorination after heat treatment

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Experimental program
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Effect test

Embodiment 1

[0034] Firstly, 580 g of waste tank lining and 520 g of blast furnace slag were weighed, crushed to a particle size of about 3 mm or less, and mixed into a heat treatment reactor. The reactor was heated by a heating device to reach a temperature of 750° C. and kept at a high temperature for 3 hours. Then, put the reacted residue and exhaust fume in the calcification reaction tank, and let it cool down naturally. Rinse milk of lime with a concentration close to saturation in the calcification reaction tank, soak for 3.5 hours, and then filter to obtain the final residue.

[0035] According to the hazardous waste identification standard and leaching toxicity standard (GB5085.3-2007), the final residue was tested for hazards. The results showed that the inorganic fluoride (excluding calcium fluoride, calculated as F-) in the leachate was 13mg / L; The chemical compound is 0.027mg / L, indicating that the final residue is no longer a hazardous waste, thus realizing the harmlessness o...

Embodiment 2

[0037] Firstly, 1000 g of waste tank lining and 800 g of blast furnace slag were weighed, crushed to a particle size of about 5 mm or less, and mixed into a heat treatment reactor. The reactor was heated by a heating device to reach a temperature of 850° C. and kept at a high temperature for 5 hours. Then, put the reacted residue and exhaust fume in the calcification reaction tank, and let it cool down naturally. Rinse milk of lime with a concentration close to saturation in the calcification reaction tank, soak for 4.5 hours, and then filter to obtain the final residue.

[0038] According to the hazardous waste identification standard and leaching toxicity standard (GB5085.3-2007), the final residue was tested for hazards, and the results showed that the inorganic fluoride (excluding calcium fluoride, calculated as F-) in the leachate was 7 mg / L; The chemical compound is 0.011mg / L, indicating that the final residue is no longer a hazardous waste, thus realizing the harmlessn...

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Abstract

The invention discloses an aluminum electrolysis waste slot lining hazard-free treatment method for carrying out wet strengthening for defluorination after heat treatment. The method comprises the steps that a waste slot lining is smashed, and the smashed waste slot lining and a smashed calcification reaction agent are stirred and mixed; the mixture is put into a heat reactor, and the reactor is heated through a heating device; tail gas generated in the heating process is subjected to bag type dust removal purification treatment; in the heat reaction process, dust collected in the left residue and tail gas purification process is put into a calcification reaction pool to be naturally cooled; lime milk is used for carrying out drip washing and soaking on residues and dust cooled to normal temperature in the calcification reaction pool, and soluble sodium fluoride which is not subjected to heat treatment and curing in the residues continues to react with lime milk to generate calcium fluoride; and matter generated after the reaction is filtered, the final residues are completely harmless and are used for metallurgy, building, road repairing and the like, and the defect that toxic hydrogen cyanide gas is possibly generated when only wet treatment is adopted is overcome. The process is simple, operation is convenient, cost is low, and thorough hazard-free treatment of cyanide and almost complete conversion of fluoride are achieved.

Description

technical field [0001] The invention relates to an innocuous strengthening treatment of waste aluminum electrolysis tank linings, in particular to a harmless treatment of waste aluminum electrolysis tank linings in which fluorine is strengthened by wet method after heat treatment. It involves all waste tank linings discarded in the electrolytic aluminum production industry, including waste cathode carbon, graphite lining, etc. Background technique [0002] According to the data of Qianzhan Industry Research Institute: in June 2015, the output of primary aluminum (electrolytic aluminum) in China was 2,755,813.67 tons, a year-on-year increase of 17.96%; from January to June 2015, the cumulative output of primary aluminum (electrolytic aluminum) in China was 15,608,240.11 tons, a year-on-year increase of 11.69% %. For every ton of raw aluminum produced, 30kg to 50kg of waste tank linings will be produced. Waste tank linings are included in the national list of hazardous waste...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 桑义敏
Owner BEIJING JINGBILAN ENVIRONMENTAL PROTECTION TECH CO LTD