Aluminum electrolysis cell waste cell lining processing method based on chemical precipitation and redox reaction

A technology for an aluminum electrolytic cell and a treatment method, which is applied in the field of aluminum electrolytic cell waste lining treatment based on chemical precipitation and redox reaction, can solve the problems of high investment and operating costs, fluoride entering the residue, and not being recycled. Achieve the effect of low processing cost and high production efficiency

Active Publication Date: 2016-02-17
内蒙古泓旺铝业有限责任公司
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AI Technical Summary

Problems solved by technology

However, the incineration method has many shortcomings: ①The incineration process is complex, requiring special incineration equipment, and the investment and operation costs are high; ②The fluoride with high added value eventually enters the residue and has not been recycled; ③Exhaust gas such as smoke and flue gas is produced Need to deal with; ④ can only deal with carbonaceous waste tank lining (accounting for about 30% of the waste tank lining weight), 70% of the waste tank lining still needs to be safely landfilled

Method used

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  • Aluminum electrolysis cell waste cell lining processing method based on chemical precipitation and redox reaction

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Embodiment 1

[0026] Firstly, the discarded aluminum electrolysis waste tank lining is broken into 1-3mm particles, weighed 500g and placed in the oxidation reaction tank, then put 500ml of sodium hypochlorite solution with a mass concentration of 2%, stirred and mixed for 1 hour; then passed through the anti-corrosion screen Filter the residue after the oxidation reaction, place the residue in a sedimentation reaction tank, soak it in 500ml of lime water with a mass concentration of 0.15% for 1.5 hours, and after the calcification reaction has fully occurred, filter through an anti-corrosion screen to obtain the final residue.

[0027] 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 39mg / L; The chemical compound is 0.052mg / L, indicating that the final residue is no longer a hazardo...

Embodiment 2

[0029] First, break the waste aluminum electrolysis tank lining into 3-5mm particles, weigh 1500g and place it in the oxidation reaction tank, then put 1500ml of sodium hypochlorite solution with a mass concentration of 2%, stir and mix for 45min; then filter through an anti-corrosion screen Oxidize the residue after the reaction, place the residue in a sedimentation reaction tank, soak in 1500ml of lime water with a mass concentration of 0.15% for 1.2 hours, and after the calcification reaction occurs fully, filter through an anti-corrosion screen to obtain the final residue.

[0030] According to the hazardous waste identification standard and leaching toxicity standard (GB5085.3-2007), the hazard detection of the final residue shows that the inorganic fluoride (excluding calcium fluoride, calculated as F-) in the leachate is 65mg / L; The chemical compound is 0.079mg / L, indicating that the final residue is no longer a hazardous waste, thus realizing the harmlessness of the was...

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Abstract

The invention discloses an aluminum electrolysis cell waste cell lining processing method based on chemical precipitation and redox reaction. A waste cell lining is crushed and ground to reach the granularity of 1-10 mm and then input into an oxidation reaction pool; a sodium hypochlorite solution is added according to the proportion 1.2-2.0 times of the theoretical value, the alkalescent pH value is controlled to be 7.0-8.5, dangerous element cyanide has a redox reaction with the sodium hypochlorite solution and then is removed, and the reaction time is 0.5-1.0 h; an anti-corrosion sieve is used for filtering out residues after the redox reaction and the residues are put into a precipitation reaction pool; whitewash with the concentration 0.8-1.0 time of the saturation concentration value is added into the precipitation reaction pool, and the residues are soaked for 1.0-1.5 h, are combined with fluoride for reaction and then generate indissolvable CaF2; the anti-corrosion sieve carries out filtering after the precipitation reaction, and obtained filtrate can serve as raw materials for the sodium carbonate industry and aluminum oxide industry; the filtered-out final residues are harmless and can serve as raw materials used for road construction, buildings, cement, fire resistance and other industries. The aluminum electrolysis cell waste cell lining processing method based on chemical precipitation and redox reaction is simple and convenient to implement, low in processing cost and high in production efficiency and does not need an incinerator or other combustion equipment.

Description

technical field [0001] The invention relates to a treatment method for all electrolyzer linings discarded in the process of electrolytic production of metal aluminum, including waste cathode carbon, graphite lining, etc., especially relates to a waste aluminum electrolyzer based on chemical precipitation and redox reaction. Tank lining treatment method. Background technique [0002] Waste tank lining is the solid waste discharged regularly from the aluminum electrolytic cell, mainly including cathode carbon block, cathode paste, graphite lining, refractory brick, insulation brick, impermeable material and insulation board, etc. Spent tank linings are hazardous waste due to high levels of fluoride and cyanide. In view of the solubility and volatility of toxic substances such as fluoride and cyanide, the harmful substances in the waste tank lining will gradually transfer to the groundwater, soil and atmospheric environment around the storage yard under conditions such as wind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 桑义敏易国庆王晓宇李姗赵馨怡王思迪张子窠
Owner 内蒙古泓旺铝业有限责任公司
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