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Method for separating and recycling electrolytes and carbon in anode carbon residues of aluminum electrolytes

A technology of separation and recovery of aluminum electrolyte, applied in the field of metallurgical process, can solve the problems of low electrolyte recovery rate, difficult industrial application, and difficult treatment of waste liquid, etc., and achieve good separation effect, good market prospect, and easy operation effect

Active Publication Date: 2016-04-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the existing methods for treating aluminum electrolyte anode carbon slag have difficulties such as large pollution, high cost, difficult disposal of waste liquid, low electrolyte recovery rate, and difficulty in large-scale industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 A method for separating and recycling electrolyte and carbon in aluminum electrolyte anode carbon slag, comprising the following steps:

[0025] 1) Pretreatment: put the aluminum electrolyte anode carbon slag raw material in a smelting furnace, and heat it in an argon atmosphere to melt the aluminum electrolyte anode carbon slag raw material in the furnace to obtain the aluminum electrolyte anode carbon slag melt; among them, the control The pressure in the melting furnace is normal pressure, the temperature is 800°C, the heating time is 50 minutes, and the holding time is 20 minutes;

[0026] 2) Separation treatment: process the aluminum electrolyte anode carbon slag melt in step 1) by blowing in hydrogen to achieve the purpose of separating the electrolyte and carbon, and obtain high-quality electrolyte and carbon products; among them, control the blowing The position is the lower part of the melt, the air flow rate is 10mL / s, and the blowing time is cont...

Embodiment 2

[0028] Embodiment 2 A method for separating and recycling electrolyte and carbon in aluminum electrolyte anode carbon slag, comprising the following steps:

[0029] 1) Pretreatment: put the aluminum electrolyte anode carbon slag raw material in a smelting furnace, and heat it under nitrogen atmosphere to melt the aluminum electrolyte anode carbon slag raw material in the furnace to obtain the aluminum electrolyte anode carbon slag melt; among them, control the smelting The pressure in the furnace is normal pressure, the temperature is 850°C, the heating time is 40 minutes, and the holding time is 10 minutes;

[0030] 2) Separation treatment: process the aluminum electrolyte anode carbon slag melt described in step 1) by blowing nitrogen gas to achieve the purpose of separating electrolyte and carbon, and obtain high-quality electrolyte and carbon products; among them, control blowing The position is in the middle of the melt, the air flow rate is 5mL / s, and the blowing time is...

Embodiment 3

[0032] Embodiment 3 A method for separating and recycling electrolyte and carbon in aluminum electrolyte anode carbon slag, comprising the following steps:

[0033] 1) Pretreatment: put the aluminum electrolyte anode carbon slag raw material in a smelting furnace, and heat it under nitrogen atmosphere to melt the aluminum electrolyte anode carbon slag raw material in the furnace to obtain the aluminum electrolyte anode carbon slag melt; among them, control the smelting The pressure in the furnace is normal pressure, the temperature is 900°C, the heating time is 30 minutes, and the holding time is 5 minutes;

[0034] 2) Separation treatment: process the aluminum electrolyte anode carbon slag melt described in step 1) by blowing in carbon monoxide to achieve the purpose of separating electrolyte and carbon, and obtain high-quality electrolyte and carbon products; among them, control blowing The position is the upper part of the melt, the air flow rate is 20mL / s, and the blowing ...

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Abstract

The invention discloses a method for separating and recycling electrolytes and carbon in anode carbon residues of aluminum electrolytes. According to the method, the anode carbon residues of the aluminum electrolytes are placed in a smelting furnace and heated and melted for obtaining flux of the anode carbon residues of the aluminum electrolytes in the atmosphere of nitrogen gas or inert gas, and then gas is blown to the flux for separating the electrolytes and the carbon in the anode carbon residues of the aluminum electrolytes and obtaining the high-quality electrolytes and the high-quality carbon. The method has the advantages that the technological process is simple, the operation is easy, and the economic benefit is high. Through detection, the content of the carbon in the electrolytes obtained through the method is lower than 1%, the content of the electrolytes in the carbon is lower than 2%, and the separation efficiency is higher than 98%.

Description

technical field [0001] The invention belongs to the technical field of metallurgical processes, and in particular relates to a method for separating and recovering electrolyte and carbon in aluminum electrolyte anode carbon slag. Background technique [0002] A large amount of carbon slag containing electrolyte will be produced in the process of aluminum electrolysis. According to statistics, every ton of primary aluminum produced will produce 10 kg to 15 kg of carbon slag. In 2015, the output of primary aluminum in my country was about 26 million tons to 28 million tons. The electrolyte contained in the carbon residue is a fluorine-containing compound. If it is not treated, once it spreads to the soil or water, it will pose a great threat to the ecological environment and human health. [0003] At present, there are mainly flotation method and roasting method to deal with aluminum electrolyte anode carbon slag. The process route of the flotation method is to first clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06C25C3/18C25C3/12
CPCC25C3/06C25C3/125C25C3/18
Inventor 余文轴蒋伟燕郑忠李杰
Owner CHONGQING UNIV
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