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Method for conducting ultrasonic-assisted acid leaching treatment on aluminum electrolytic waste cathode carbon blocks

A technology for waste cathode carbon blocks and waste aluminum electrolytic cells, which is applied to the removal of solid waste and other directions, can solve the problems of low production efficiency and product purity of leaching process, reducing carbon content in product carbon powder, affecting the reaction between electrolyte and solution, etc.

Active Publication Date: 2016-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The existing leaching process of waste cathode carbon blocks for aluminum electrolysis has low production efficiency and product purity, and a long production cycle. carbon content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 70.9, Al8.23, O 9.63, F 5.31, Na 3.58, Fe 1.21, crushed to -200 mesh, accounting for 90%, Add the crushed powder into H at a liquid-solid ratio of 7:1 2 SO 4 In the acid solution with a concentration of 2.5mol / L, the acid leaching process is carried out in an ultrasonic environment with a constant temperature of 90°C, a stirring speed of 700rpm, a reaction time of 45min, an ultrasonic frequency of 40KHz, a power of 200W, and an ultrasonic treatment time of 30min; filter to obtain carbon powder and filtrate After drying, 7.2 g of carbon powder with a purity of 98.47% was obtained.

[0032] Adjust the pH of the filtrate to neutral, evaporate and crystallize to obtain electrolyte powder, and reuse distilled water.

[0033] The whole process cycle is 45 minutes (excluding crushing and preparation and evaporation crystallization process), a...

Embodiment 2

[0039] Take 20g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 70.9, Al8.23, O 9.63, F 5.31, Na 3.58, Fe 1.21, crushed to -200 mesh, accounting for 50%, Add the crushed powder into H at a liquid-solid ratio of 10:1 2 SO 4 In the acid solution with a concentration of 2mol / L, the acid leaching process was carried out in an ultrasonic environment with constant temperature of 50°C, stirring speed of 800rpm, reaction time of 45min, ultrasonic frequency of 40KHz, power of 50W, and ultrasonic treatment time of 15min; carbon powder and filtrate were obtained by filtration. After drying, 14.49 g of carbon powder with a purity of 97.88% was obtained.

[0040] Adjust the pH of the filtrate to neutral, evaporate and crystallize to obtain electrolyte powder, and reuse distilled water.

[0041] The whole process cycle is 45 minutes (excluding crushing and preparation and evaporation crystallization process), an...

Embodiment 3

[0043] Take 30g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt%): C 70.9, Al8.23, O 9.63, F 5.31, Na 3.58, Fe 1.21, crushed to -200 mesh, accounting for 90%, Add the crushed powder into H at a liquid-solid ratio of 7:1 2 SO 4 In the acid solution with a concentration of 0.5mol / L, the acid leaching process is carried out in an ultrasonic environment, with a constant temperature of 25°C, a stirring speed of 1000rpm, a reaction time of 60min, an ultrasonic frequency of 25KHz, a power of 200W, and an ultrasonic treatment time of 60min; filter to obtain carbon powder and filtrate After drying, 21.62g of carbon powder with a purity of 98.38% was obtained.

[0044] Adjust the pH of the filtrate to neutral, evaporate and crystallize to obtain electrolyte powder, and reuse distilled water.

[0045] The whole process cycle is 180min (excluding the process of crushing and preparing materials and evaporative cryst...

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Abstract

The invention relates to a method for conducting ultrasonic-assisted acid leaching treatment on aluminum electrolytic waste cathode carbon blocks and belongs to the technical field of aluminum electrolytic solid waste resource recovery. The method comprises the steps that the aluminum electrolytic waste cathode carbon blocks are crushed and added into acid liquor to be subjected to leaching, and powdered carbon and filtrate are obtained through filtration; acid leaching is carried out in an ultrasonic environment; and the pH value of the filtrate is adjusted to be neutral, crystals are separated out through evaporative crystallization, a cryolite and aluminum hydroxide mixture is obtained through filtration, and distilled water is utilized repeatedly. The method is simple in process, operating is convenient, the cyclic utilization rate of materials is high, environmental pollution is little, the reaction speed is increased through the synergistic effect of ultrasonic waves and acid leaching, and the purity of powdered carbon products is improved. The method is suitable for treatment of aluminum electrolytic waste cathode carbon blocks with the carbon content higher than 50%, and the purity of obtained powdered carbon can reach up to 98.47%.

Description

technical field [0001] The invention relates to a method for ultrasonic-assisted acid leaching treatment of aluminum electrolysis waste cathode carbon blocks, and belongs to the technical field of recycling and utilization of aluminum electrolysis solid waste resources. Background technique [0002] The largest pollutant and also the largest waste produced in the production process of aluminum electrolysis is the waste cathode carbon block of aluminum electrolysis. Soluble F in waste cathode carbon blocks of aluminum electrolytic cells — The dissolution rate is about 6000mg / L, CN — The dissolution rate is about 10 mg / L to 40 mg / L, far exceeding the "Identification Standards for Hazardous Wastes Corrosion Identification" (GB5085.1-2007) and the "Identification Standards for Hazardous Wastes" in "General Rules for Identification Standards for Hazardous Wastes" (2007) and "Leaching Toxicity for Identification Standards for Hazardous Wastes" Identification" (GB5085.3-2007) F ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C25C3/12
CPCB09B3/00C25C3/125
Inventor 肖劲袁杰田忠良杨凯余柏烈仲奇凡黄金堤赖延清李劼
Owner CENT SOUTH UNIV
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