Method for electrolyzing waste and old cathode carbon block by comprehensive utilization of aluminum

A technology of waste cathode carbon block and aluminum electrolysis, which is applied in solid waste removal, waste treatment, alumina/aluminum hydroxide, etc. It can solve the problems of low electrolyte recovery rate, difficult fluoride recovery, and poor separation effect. Achieve good application prospects, high recovery rate, and simple operating conditions

Active Publication Date: 2009-07-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ash content of the carbon product obtained by flotation separation is relatively high, resulting in low electrolyte recovery rate and poor separation effect. In addition, it is difficult to recover the fluoride dissolved in water during the grinding and flotation process.

Method used

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  • Method for electrolyzing waste and old cathode carbon block by comprehensive utilization of aluminum
  • Method for electrolyzing waste and old cathode carbon block by comprehensive utilization of aluminum
  • Method for electrolyzing waste and old cathode carbon block by comprehensive utilization of aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Three kinds of waste cathode carbon blocks with different carbon contents were crushed respectively, and the ore grinding equipment was used for grinding treatment, until the part of the waste cathode carbon blocks with a particle size less than 0.075mm accounted for 40wt%.

[0026] After ore grinding, adjust the pulp concentration to be 10wt%, and adjust the pH value of the pulp to 9 with inorganic acid and alkali; then put it into the flotation equipment, adopt No. 2 oil (pine alcohol oil) as a foaming agent, and kerosene as a collector , where the amount of foaming agent No. 2 oil is 30g per ton of waste cathode carbon block; the amount of collector kerosene is 50g per ton of waste cathode carbon block. 3-stage grinding is adopted.

[0027] An aluminum nitrate solution with a concentration of 0.5 mol / L is used to leach the electrolyte of the carbon product obtained by flotation, and the addition amount is 10:1 according to the liquid-solid ratio. The relevant proces...

Embodiment 2

[0032] Three kinds of waste cathode carbon blocks with different carbon contents were crushed, and the ore grinding equipment was used for grinding treatment, until the part of the waste cathode carbon blocks with a particle size less than 0.075mm accounted for 71wt%.

[0033] After grinding, adjust the pulp concentration to 20wt%, and adjust the pH value of the pulp to 11 with inorganic acids and bases; then put it into the flotation equipment, adopt No. 2 oil (pine alcohol oil) as a foaming agent, and kerosene as a collector , wherein the amount of foaming agent No. 2 oil is 200g per ton of waste cathode carbon block; the amount of collector kerosene is 300g per ton of waste cathode carbon block. 3-stage grinding is adopted.

[0034] An aluminum chloride solution with a concentration of 1.0 mol / L is used to leach the electrolyte of the carbon product obtained by flotation, and the addition amount is 8:1 according to the liquid-solid ratio. The relevant processing results ar...

Embodiment 3

[0039] Three kinds of waste cathode carbon blocks with different carbon contents were crushed respectively, and the ore grinding equipment was used for grinding treatment, until the part of the waste cathode carbon blocks with a particle size less than 0.075mm accounted for 78wt%.

[0040] After ore grinding, adjust the pulp concentration to 30wt%, and adjust the pH value of the pulp to 14 with inorganic acid and alkali; then put it into the flotation equipment, adopt No. 2 oil (pine alcohol oil) as a foaming agent, and kerosene as a collector , where the amount of foaming agent No. 2 oil is 300g per ton of waste cathode carbon block; the amount of collector kerosene is 500g per ton of waste cathode carbon block. 3-stage grinding is adopted.

[0041] An aluminum chloride solution with a concentration of 1.5 mol / L is used to leach the electrolyte of the carbon product obtained by flotation, and the addition amount is 5:1 according to the liquid-solid ratio. The relevant proces...

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Abstract

The invention relates to a method for comprehensively using aluminium to electrolyze a waste cathode carbon block, which belongs to the technical field of environment protection and comprises the following steps: crushing and grinding the waste cathode carbon block; adjusting the concentration and the PH value of ore slurry after the grinding, then using floatation equipment to carry out floatation treatment, and separating electrolyte and carbon which are contained in the waste cathode carbon block; using an aluminium salt solution to soak for extracting the electrolyte contained in a carbon product obtained from the floatation, and further improving the grade of a high-carbon product; mixing the grinding waste water, the floatation waste water and the soaking solution, and adding CaO and CaCl2 to precipitate and recover aluminium and fluothane in the mixture. The method for comprehensively using aluminium to electrolyze a waste cathode carbon block has simple operating condition, low energy consumption, high recovery ratio of valuable substances and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for comprehensively utilizing waste cathode carbon blocks of aluminum electrolysis. Background technique [0002] Aluminum electrolytic cell waste cathode carbon block is the waste discharged in the aluminum electrolysis industry. According to statistics, about 30-50 kg of waste cathode carbon blocks are discharged for every 1 ton of primary aluminum produced. As the annual production of aluminum worldwide increases, the amount of waste carbon briquettes discharged continues to increase. The main components of the waste cathode carbon block of aluminum electrolytic cell are carbon and electrolyte, in which the carbon content is 45-85% (the degree of graphitization of carbon reaches 80-90%), and the electrolyte content is about 15-55% (the electrolyte is mainly composed of cryolite, Sodium fluoride, aluminum oxide and calcium fluoride, while...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C25C3/06B03D1/08C04B35/52C01B9/08C01F7/02
CPCY02P70/10Y02W30/20
Inventor 翟秀静符岩畅永锋范川林李斌川王兆文任必军
Owner NORTHEASTERN UNIV
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