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Method for adding hydrogen fluoride to keep fluorine balance of aluminum electrolysis system

A technology of aluminum electrolysis and hydrogen fluoride, applied in the field of non-ferrous metallurgy, can solve the problems of undisclosed aluminum electrolysis system fluorine balance process operation mode and other problems, achieve the effects of excellent performance, saving construction investment and improving performance

Pending Publication Date: 2018-11-06
淄博海慧工程设计咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In the prior art, aluminum fluoride is added to the aluminum electrolysis system as a co-solvent, and a new process operation mode of fluorine balance in the aluminum electrolysis system has not been disclosed

Method used

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  • Method for adding hydrogen fluoride to keep fluorine balance of aluminum electrolysis system
  • Method for adding hydrogen fluoride to keep fluorine balance of aluminum electrolysis system
  • Method for adding hydrogen fluoride to keep fluorine balance of aluminum electrolysis system

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Embodiment 1

[0059] A 200,000 tons / year electrolytic aluminum series flue gas purification system replaces the process of adding aluminum fluoride by adding hydrogen fluoride to maintain fluorine balance.

[0060] The hydrogen fluoride gas used is hydrogen fluoride produced by the fluorite sulfuric acid process.

[0061] The flue gas purification system only adds a hydrogen fluoride addition system on the basis of the traditional preparation. The hydrogen fluoride addition system is selected in the flue gas exhaust pipe 20m behind the exhaust machine, 60m away from the reaction adsorption system, and all alumina in the process passes through the flue gas purification system. After adsorption, it enters the electrolytic cell. The average temperature of the flue gas during the adsorption process is 200 °C. During the purification process of the electrolytic flue gas, 230 kg / h of HF is fed into the system, and 44 tons / h of Al is added to the system. 2 O 3 Participating in the adsorption reac...

Embodiment 2

[0063] A 400,000 tons / year electrolytic aluminum series flue gas purification system, using supplementary hydrogen fluoride instead of adding aluminum fluoride.

[0064] The flue gas purification system has made the following changes and designs on the basis of traditional preparation:

[0065] 1. Added hydrogen fluoride gas filling system;

[0066] 2. Strengthen the gas flow of the adsorption reaction of aluminum fluoride to adsorb fluorine-containing gas, appropriately increase the reaction adsorption area by 20%, and prolong the adsorption contact time.

[0067] The hydrogen fluoride gas used was hydrogen fluoride produced by the decomposition of fluosilicic acid with sulfuric acid.

[0068] The supplementary hydrogen fluoride system is selected in the exhaust main pipe 30m behind the exhaust machine, about 100m away from the reaction adsorption system. All aluminum fluoride in the process is adsorbed by the flue gas purification system and then enters the electrolytic ce...

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Abstract

The invention relates to a method for adding hydrogen fluoride to keep fluorine balance of an aluminum electrolysis system and belongs to the technical field of non-ferrous alloy. The method for adding hydrogen fluoride to keep the fluorine balance of the aluminum electrolysis system comprises the steps that firstly, hydrogen fluoride gas is mixed with aluminum electrolysis smoke, then mixed gas performs gas-solid contact fusion with metallurgical grade alumina for aluminum electrolysis, the gas-solid separation is performed, and finally solid obtained through separation is returned to the aluminum electrolysis system. The method is scientific and reasonable in design and simple and convenient to operate, keeps the fluorine balance of the aluminum electrolysis system and excellent performance of electrolyte, saves energy, is environmentally friendly and has remarkable economic benefit, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for adding hydrogen fluoride to maintain fluorine balance in an aluminum electrolysis system, and belongs to the technical field of non-ferrous metallurgy. Background technique [0002] Since 1886, the American Hall (C.M.Hall) and the French Heroult (Heroult) almost simultaneously and independently invented the method of electrolysis, the electrolysis of alumina dissolved in cryolite (sodium hexafluoroaluminate) melt In the more than 130 years since the method of producing metal aluminum, aluminum and fluorine have been inseparable. With the development of the world's electrolytic aluminum industry. [0003] Fluorine salt is a general term for fluorine-containing salts, and refers to a compound in which a metal cation and a fluoride ion are combined. Aluminum fluoride salts specifically refer to aluminum fluoride and cryolite. Aluminum fluoride salts are mainly used in the aluminum industry. Therefore, the developme...

Claims

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Application Information

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IPC IPC(8): C25C3/18C25C3/20C25C3/22
CPCC25C3/18C25C3/20C25C3/22
Inventor 焦占忠张凤炳赵刚李汝勇杨保鑫韩纪磊谷桂芝焦伟郭良义李克甫焦文帅
Owner 淄博海慧工程设计咨询有限公司