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Method for treating aluminum electrolysis waste cathode carbon block using acid and alkali combination method

A technology of waste cathode carbon block and acid-base combination, which is applied in the direction of solid waste removal, can solve the problems of high cost that cannot be applied to industry, low efficiency of electrolyte recovery, average cost reduction, etc., and achieves low comprehensive average cost, cheap price, The effect of simple ingredients

Inactive Publication Date: 2009-03-18
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) Someone once used evaporation method to recover sodium fluoride, but the cost was too high to be applied in industry, and only a single substance was recovered, and other substances were not processed;
[0008] (2) Alkali is used to treat waste cathodes and reuse the combustion method to process carbon, the electrolyte recovery efficiency is low, and the cost is high;
[0010] All the above-mentioned methods have the problem of high cost without exception. It can be seen that only by adopting a simultaneous recovery of multiple substances and harmless process can the average cost be reduced and industrial application possible.

Method used

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  • Method for treating aluminum electrolysis waste cathode carbon block using acid and alkali combination method
  • Method for treating aluminum electrolysis waste cathode carbon block using acid and alkali combination method
  • Method for treating aluminum electrolysis waste cathode carbon block using acid and alkali combination method

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Embodiment 1

[0053] Take 5g of aluminum electrolysis waste cathodes, crush them and grind them to a particle size of 100-165μm to obtain waste cathode powders; add waste cathode powders to 50mL of NaOH aqueous solution, the concentration of NaOH aqueous solution is 60g / L, mix the waste cathode powders The NaOH aqueous solution was reacted under stirring and boiling conditions for 3 h, and the stirring speed was 200 rpm. During the reaction, water was added to the reaction solution to keep the total volume constant.

[0054] The reacted material is filtered to obtain a filtered solid phase and a primary filtrate, and the filtered solid phase is washed with water to a pH value of 7, and the washed solid phase is added to 50 mL of aqueous HCl solution, and the concentration of the aqueous HCl solution is 16 wt%. , react 3h under the condition of stirring and boiling, stirring speed 200rpm, in the reaction process, add water to the reaction solution to keep the total volume constant; the materi...

Embodiment 2

[0061] Take 10g of aluminum electrolysis waste cathodes, crush them and grind them to a particle size of 100-165μm to obtain waste cathode powders; add the waste cathode powders to 100mL of NaOH aqueous solution, the concentration of NaOH aqueous solution is 60g / L, mix the waste cathode powder The NaOH aqueous solution was reacted under stirring and boiling conditions for 3 h, the stirring speed was 250 rpm, and water was added to the reaction solution during the reaction to keep the total volume constant.

[0062] The reacted material is filtered to obtain a filtered solid phase and a primary filtrate. The filtered solid phase is washed with water until the pH value is 7, and the washed solid phase is added to 100 mL of HCl aqueous solution, and the concentration of the HCl aqueous solution is 16 wt%. , react 3h under the condition of stirring and boiling, stirring speed 250rpm, in the reaction process, add water to the reaction solution to keep the total volume constant; the ...

Embodiment 3

[0069] Take 100g of aluminum electrolysis waste cathode, crush it and grind it to a particle size of 100-165μm to obtain waste cathode powder; add waste cathode powder to 1000mL NaOH aqueous solution, the concentration of NaOH aqueous solution is 60g / L, mix the waste cathode powder The NaOH aqueous solution was reacted under stirring and boiling conditions for 3 h, and the stirring speed was 300 rpm. During the reaction, water was added to the reaction solution to keep the total volume constant.

[0070] The reacted material was filtered to obtain a filtered solid phase and a primary filtrate, and the filtered solid phase was washed with water until the pH value was 7, and the washed solid phase was added to 1000 mL of HCl aqueous solution, and the concentration of the HCl aqueous solution was 16 wt%. , reacted for 3h under stirring and boiling conditions, and the stirring speed was 300rpm. During the reaction, water was added to the reaction solution to keep the total volume c...

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Abstract

A method for treating aluminum electrolytic waste cathode carbon blocks by an acid and alkali combination method is characterized by comprising the following steps: (1) aluminum electrolytic waste cathode is added to concentrated basic solution for reaction; a filtered solid phase is obtained by filtering and is added to concentrated acid for reaction; and carbon powder is obtained after filtration; (2) filtrates are mixed and dropwise added with the concentrated basic solution, the pH value thereof is adjusted to 9, the obtained mixture is kept standing and filtered to obtain cryolite; (3) the filtrate is added with saturated bleach solution, kept standing and filtered to obtain calcium fluoride; (4) the fourth filtrates is heated, evaporated and crystallized to obtain sodium chloride solid. With the purposes of waste utilization and environmental protection, the method successfully provides the process for treating aluminum electrolytic waste cathode by the acid and alkali method, which causes the waste cathode to not be the conventional waste and pollutant and to become artificial mineral resources. The method solves the problem of waste utilization in aluminum electrolysis industry, improves benefit, and improves the comprehensive level of the aluminum electrolysis industry of China.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and in particular relates to a method for treating waste cathode carbon blocks of aluminum electrolysis by an acid-base combined method. Background technique [0002] At present, the aluminum electrolysis industry uses large prebaked tanks. The carbon cathodes of aluminum electrolytic cells are usually made of anthracite and pitch binder, and their service life is generally 3 to 5 years. When the damaged cathode of the electrolytic cell was dug out, it was found that the carbon cathode had undergone obvious changes. The carbon block has many cracks, holes and erosion pits filled with electrolyte. In each part of the cathode, the infiltration amount of electrolyte is different: near the edge of the tank, the amount of electrolyte generally accounts for about 40%; in the carbon seam, the infiltration amount is as high as 70%; and in the middle of the tank, the content is about 25%. X-...

Claims

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Application Information

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IPC IPC(8): B09B3/00C25C3/08
Inventor 石忠宁任必军王兆文魏应伟李伟徐君莉高炳亮
Owner NORTHEASTERN UNIV
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