Combined treatment method of alkaline leaching liquid, acid leaching liquid and pulverized fuel ash of aluminum electrolysis cell waste cathode carbon block

A technology of aluminum electrolytic cell waste and cathode carbon block, which is applied in the direction of alkali metal fluoride, alumina/aluminum hydroxide, silicon dioxide, etc., can solve the problems of unstable treatment effect and large energy consumption, and achieve the reduction of industrial acid Use of alkali and additives, reduction in consumption, effects of reduction in usage

Inactive Publication Date: 2017-09-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the early stage of process development, the traditional leaching method was directly adopted, and there were still problems such as unstable treatment effect and high energy consumption.

Method used

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  • Combined treatment method of alkaline leaching liquid, acid leaching liquid and pulverized fuel ash of aluminum electrolysis cell waste cathode carbon block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Step (1): Mix the alkali leaching solution and the fly ash according to the liquid-solid ratio of 0.5:1, and ball mill to -200 mesh to account for 65%;

[0073] Step (2): The fly ash processed in step (1) is mixed with the alkali leaching solution of the waste cathode carbon block of the aluminum electrolytic cell according to the liquid-solid mass ratio of 5:1, the stirring rate is 180r / min, and the heating temperature is 80 Under the condition of ℃, carry out secondary alkali leaching, react for 120min, filter to obtain the first filtrate and the first filter residue, and dry the first filter residue for use;

[0074] Step (3): The first filter residue obtained in step (2) and the acid leaching solution of the waste cathode carbon block of the aluminum electrolytic cell are carried out according to the liquid-solid mass ratio of 5:1, and the acid leaching is carried out under the condition of an ultrasonic frequency of 30KHz, and the reaction is carried out for 40 minu...

Embodiment 2

[0080] Step (1): mixing the alkali leaching solution and the fly ash according to the liquid-solid ratio mass ratio of 4:1, and ball milling to -200 mesh to account for 65%;

[0081] Step (2): The fly ash processed in step (1) is mixed with the alkali leaching solution of the waste cathode carbon block of the aluminum electrolytic cell according to the liquid-solid mass ratio of 20:1, and the stirring rate is 180r / min, and the heating temperature is 80 Under the condition of ℃, carry out secondary alkali leaching, react for 120min, filter to obtain the first filtrate and the first filter residue, and dry the first filter residue for use;

[0082] Step (3): The first filter residue obtained in step (2) and the acid leaching solution of the waste cathode carbon block of the aluminum electrolytic cell are carried out according to the liquid-solid mass ratio of 15:1, and the acid leaching is carried out under the condition of an ultrasonic frequency of 90KHz, and the reaction is ca...

Embodiment 3

[0088] Step (1): mixing the alkali leaching solution and the fly ash according to the liquid-solid ratio mass ratio of 1:1, and ball milling to -200 mesh to account for 80%;

[0089] Step (2): Mix the fly ash processed in step (1) with the alkali leaching solution of the waste cathode carbon block of the aluminum electrolytic cell according to the liquid-solid mass ratio of 10:1, the stirring rate is 150r / min, and the heating temperature is 70 Under the condition of ℃, carry out secondary alkali leaching, react for 150min, filter to obtain the first filtrate and the first filter residue, and dry the first filter residue for use;

[0090] Step (3): The first filter residue obtained in step (2) and the acid leaching solution of the waste cathode carbon block of the aluminum electrolytic cell are carried out according to the liquid-solid mass ratio of 7:1, and the acid leaching is carried out under the condition of an ultrasonic frequency of 40KHz, and the reaction is carried out ...

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Abstract

The invention discloses a combined treatment method of alkaline leaching liquid, acid leaching liquid and pulverized fuel ash of an aluminum electrolysis cell waste cathode carbon block. The pulverized fuel ash and the alkaline leaching liquid of the aluminum electrolysis cell waste cathode carbon block are mixed and are subjected to ball milling; primary alkaline leaching is performed; then, the alkaline leaching liquid is replenished; secondary alkaline leaching is performed; solid and liquid separation of a secondary alkaline leaching system is separated to obtain first filter liquid and first filter slag; the first filter slag and the acid leaching liquid of the aluminum electrolysis cell waste cathode carbon block are mixed; acid leaching is performed under the assistance of ultrasound; then, solid-liquid separation is performed to obtain second filter liquid; the pH of second filter liquid is increased in a gradient way; Fe(OH)3, Al(OH)3 and H2SiO3 are obtained from the second filter liquid through sequential separation; finally, the filter liquid subjected to H2SiO3 separation is concentrated to obtain NaF. The whole treatment method achieves the goals of treating wastes by wastes, reducing the energy consumption, reducing the consumption of industrial raw materials and reducing the equipment loss.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and reuse, and in particular relates to a combined treatment method using high-silicon and high-alumina waste residue and an acid-base leaching solution of cathode carbon blocks of an aluminum electrolytic cell. technical background [0002] During the production process of aluminum electrolysis, the cathode carbon block expands due to the penetration of impurities such as metal sodium and cryolite, which further causes damage to the electrolytic cell. Domestic aluminum electrolytic cells need to be overhauled when they are about 2000 days old. The waste cathode carbon blocks produced during the overhaul process are one of the main solid pollutants in the aluminum electrolysis industry. The statistical results of the fluorine balance survey of industrial aluminum electrolytic cells show that for every ton of electrolytic aluminum produced, about 10kg of waste cathode carbon blocks will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C01F7/02C01B33/12C01D3/02
CPCC01B33/12C01D3/02C01F7/02C01G49/02
Inventor 田忠良赖延清杨凯张志剑杨超袁杰肖劲张凯李劼
Owner CENT SOUTH UNIV
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