Treatment method of aluminium electrolytic bath waste cathode carbon blook innocuousnes

A technology of waste cathode carbon block and aluminum electrolytic cell, which is applied in the direction of solid waste removal, etc., can solve the problem of affecting the comprehensive effect of harmless treatment of waste cathode carbon block, inability to harmless waste cathode carbon block, and no effective recovery of fluorination Salt and other problems, to achieve significant economic and environmental benefits, easy operation, and low treatment costs

Active Publication Date: 2006-06-14
河南华慧有色工程设计有限公司 +1
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AI Technical Summary

Problems solved by technology

[0003] At present, the treatment method of the waste cathode carbon block of having reported has flotation method and sulfuric acid decomposition method, and its technical essence is wet process, can reclaim part fluoride salt and carbon powder when processing, and the technical problem of existence is: (1 ) cannot remove cyanide; (2) cyanide and some fluoride transfer into the solution to cause secondary pollution, and the waste liquid cannot be discharged up to standard
[0004] Because the waste cathode carbon block has the characteristics of C and fluoride salt, the existing technology often fails to effectively recover the high value-added fluoride salt in the waste cathode carbon block when the waste cathode carbon block is completely harmless, or cannot make the waste cathode carbon block The carbon block is effectively harmless, which affects the comprehensive effect of the harmless treatment of the spent cathode carbon block

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 1000 grams of waste cathode carbon blocks to the raw materials for roasting treatment, and add them in the form of particles smaller than 2 mm; add 100 grams of boiler cinder, add them in the form of particles smaller than 2 mm; mix the two materials evenly, and add them to the rotary kiln. 600°C for 150 minutes. After roasting, the material is decomposed with sulfuric acid with a volume concentration of 50%, and the obtained HF gas is converted into a high value-added product AlF by adsorption of aluminum hydroxide 3 , the resulting solution is filtered to obtain a primary filtrate and a primary solid phase, and the primary filtrate is decomposed by adding 5% lime for 50 minutes to obtain a secondary filtrate and a secondary solid phase, and the secondary filtrate is sent to the aluminum hydroxide production process. After analysis, the primary solid phase contained CaF 2 26.3%, SiO 2 65.1%, can be directly used as raw material for cement production; CaF is conta...

Embodiment 2

[0023] Add 1,000 grams of waste cathode carbon blocks to the raw materials for roasting treatment, and add them in the form of particles smaller than 2 mm; add 500 grams of power plant coal ash, and add them in the form of particles smaller than 2 mm; mix the two materials evenly, add them to the rotary kiln, and roast The temperature is 700°C and the time is 120 minutes. After roasting, the material is decomposed with 35% sulfuric acid, and the obtained HF gas is converted into high value-added product AlF by adsorption of aluminum hydroxide 3 , the resulting solution is filtered to obtain a primary filtrate and a primary solid phase, and the primary filtrate is decomposed by adding 1% lime for 60 minutes to obtain a secondary filtrate and a secondary solid phase, and the secondary filtrate is sent to the soda ash production process. After analysis, the primary solid phase contained CaF 2 15.6%, SiO 2 70.3%, can be directly used as raw material for refractory production; Ca...

Embodiment 3

[0025] Add 1,000 grams of waste cathode carbon blocks to the raw materials for roasting treatment, add 150 grams of the mixture of gasifier cinder and boiler cinder in the form of particles smaller than 2 mm, add in the form of particles smaller than 2 mm; mix the two materials evenly, add suspension roasting In the furnace, the firing temperature is 750°C. After roasting, the material is decomposed with 5% sulfuric acid, and the obtained HF gas is converted into high value-added product AlF by adsorption of aluminum hydroxide 3 , the resulting solution is filtered to obtain a primary filtrate and a primary solid phase, and the primary filtrate is decomposed by adding 20% ​​lime for 10 minutes to obtain a secondary filtrate and a secondary solid phase, and the secondary filtrate is sent to the aluminum hydroxide production process. After analysis, the primary solid phase contained CaF 2 10.4%, SiO 2 70.1%, can be used as raw material for brick making industry; CaF is contain...

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Abstract

A process for treating the used cathode carbon block of aluminium electrolyzer without environmental pollution includes such steps as calcining it in conjunction with the powdered coal ash rich in SiO2 and Al2O3, and ordinary-temp decomposing by sulfuric acid and lime to obtain AlF3, the material containing CaF2, SiO2 and Al2O3, and NaOH solution.

Description

technical field [0001] A method for harmless treatment of waste cathode carbon blocks of an aluminum electrolytic cell, which relates to a carbon cathode part of the discarded lining material in the process of electrolytically producing metal aluminum, especially including waste bottom carbon blocks, waste side carbon blocks and waste Harmless treatment process of all carbon cathode materials (excluding refractory materials) including cathode paste. Background technique [0002] The waste tank lining produced in the production process of electrolytic aluminum contains a large amount of soluble fluoride and cyanide. It is directly stacked in the open air and pollutes the atmosphere. It is mixed with rainwater into the river to pollute the surface water source, infiltrates into the ground and pollutes the groundwater, and landfill treatment pollutes the soil. Serious Harmful to human health and animal and plant growth. The pollution of waste tank lining has become one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C25C3/12
Inventor 李旺兴陈喜平刘凤琴王玉徐建华
Owner 河南华慧有色工程设计有限公司
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