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Method for electrolytic decyanation and graphite recovery under alkaline condition

An alkaline condition, graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve the effect of simple operation, no secondary pollution, and simple process flow

Active Publication Date: 2021-04-27
LIUPANSHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Up to now, there is no related to the safe and rapid treatment of aluminum electrolysis waste cathode at low temperature (not higher than 100 degrees Celsius) without adding additives to quickly decompose cyanide to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Take 1000 g of aluminum electrolysis tank in China, the main element content is (wt%): C61.06, Al7.09, O5.47, F14.37, Na8.71; CN-The concentration of 46.28 mg / L (according to the national standard "solid waste liquid - leaching toxicity leaching method" HJ / T299-2007 preparation analysis, the same).

[0034]step one

[0035]The aluminum electrolytic cell waste cathode carbon block is broken to obtain a spare particle having a particle size of less than 0.15 mm;

[0036]Step two

[0037]The spare particles obtained by the step from the sodium hydroxide solution were fixed to the sodium hydroxide, and the sodium hydroxide concentration was 1.2 mol / L, which was placed in the electrolytic cell. 50 ° C;

[0038]Step three

[0039]Control the electrolytic cell external voltage is 2.1V, and the second electrolytic tank cathode is accepted at 7 minutes.2Lost 3min, power-on and ventilation start and stop, O2The flow rate is 0.5 L / min, which is looped; the reaction is filtered after 150min, result...

Embodiment 2

[0066]Take 1000 g of aluminum electrolysis tank in China, the main element content is (wt%): C61.06, Al7.09, O5.47, F14.37, Na8.71; CN-The concentration is 46.28 mg / L.

[0067]step one

[0068]The aluminum electrolytic cell waste cathode carbon block is broken to obtain a spare particle having a particle size of less than 0.15 mm;

[0069]Step two

[0070]The spare particles obtained by the step from the sodium hydroxide solution were obtained into a slurry, and the sodium hydroxide concentration was 3 mol / L, placed in the electrolytic cell 20 ° C;

[0071]Step three

[0072]Control the electrolytic cell external voltage is 2.3V, and the second electrolytic tank cathode is connected to O2Lost 3min, power-on and ventilation start and stop, O2The flow is 1 L / min, which is cycled; after 180min, filtrate, resulting in graphite powder and filtrate;

[0073]Step four

[0074]The graphite powder obtained by step three was mixed with 1 mol / L hydrochloric acid to be mixed with 10: 1, reacted at 70 ° C for 1...

Embodiment 3

[0077]Take 1000 g of aluminum electrolysis tank in China, the main element content is (wt%): C61.06, Al7.09, O5.47, F14.37, Na8.71; CN-The concentration is 46.28 mg / L.

[0078]step one

[0079]The aluminum electrolytic cell waste cathode carbon block is broken to obtain a spare particle having a particle size of less than 0.15 mm;

[0080]Step two

[0081]The spare particles obtained by the steps were consumed to be a slurry, and sodium hydroxide concentration was 1.8 mol / L in the electrolytic cell at a concentration of sodium hydroxide.

[0082]Step three

[0083]Control the electrolytic cell external voltage is 2.2V, and the second electrolytic tank cathode is passed between 5 minutes.2Lost for 5 min, power-on and ventilation start and stop, O2The flow rate is 0.1 L / min, which is cycled; after 60min, filtrate, to obtain graphite powder and filtrate;

[0084]Step four

[0085]The graphite powder obtained from step three was mixed with 0.5 mol / L hydrochloric acid by liquid solid ratio of 8: 1, and ...

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Abstract

The invention relates to a method for electrolytic decyanation and graphite recovery under an alkaline condition, and belongs to the technical field of aluminum electrolysis solid waste resource recovery. According to the method, an aluminum electrolysis waste cathode is crushed and ground until the particle size is smaller than 0.15 mm, the powder and an alkaline solution are made into slurry, the slurry is treated in an electrolytic cell, O2 is intermittently introduced into the cathode of the electrolytic cell, and the treated waste cathode is filtered and dried to obtain high-purity graphite powder. O3 generated by introducing oxygen into the cathode of the electrolytic cell can oxidize and remove cyanide in the solution, and the alkaline solution reacts with part of non-carbon impurities in the waste cathode to generate soluble substances to be separated from graphite. The process flow is simple, does not generate secondary pollution, and is suitable for treating the aluminum electrolysis waste cathode with low cyanide content.

Description

Technical field[0001]The present invention relates to an alkaline condition, and a method of recovering graphite under alkaline conditions, belonging to the field of aluminum electrolytic solid waste resource recovery technology.Background technique[0002]The waste cathode is an important waste in the aluminum electrolysis industry. The waste cathode contains a large amount of carbon-quality materials, fluoride, alumina, aluminum hydroxide, and other equivalent components. The role of wind blowing, sun, rain, the poisonous substance will be transferred, enter the atmosphere, penetrate into soil and groundwater, will destroy the ecological environment, seriously affect human health and animal and plant growth. The aluminum electrolytic waste cathode contains a large amount of toxic fluoride and cyanide, which can be calendered in the waste cathode leaching solution prepared according to the national standard "solid waste liquid-leaching toxic leaching method"-The content can reach 200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215
CPCC01B32/215Y02P10/20
Inventor 袁杰郑雪梅马爱元李松
Owner LIUPANSHUI NORMAL UNIV