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Process for purifying fluorine contg. flue-gas for aluminium electrolysis

A purification process, aluminum electrolysis technology, applied in the direction of chemical instruments and methods, dispersed particle separation, separation method, etc., can solve the problems of aluminum electrolytic tank flue gas pollution, short process purification efficiency, etc., to improve the efficiency of collecting alumina, equipment Reliable operation, ensuring the effect of mixing uniformity

Active Publication Date: 2006-09-13
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

[0011] The purpose of the present invention is to provide an aluminum electrolysis flue gas with short process flow, high purification efficiency, low power consumption, reliable operation, no secondary pollution, convenient operation and management, and can thoroughly solve the problem of flue gas pollution in aluminum electrolytic cells. n-type injection two-stage countercurrent adsorption dry purification process to overcome the shortcomings of the existing technology

Method used

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  • Process for purifying fluorine contg. flue-gas for aluminium electrolysis

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Embodiment Construction

[0022] Embodiments of the present invention: as attached figure 1 Shown, the exhaust fan 2 that adopts in the present invention, pneumatic chute 12, measuring device 14 etc. all can adopt the finished product that sells on the market; Ash device 17, material distribution box 15, claw-shaped feeding device 20, sealing box 13, air lifter 18, etc. can be ordered according to the technical conditions of actual use, and are made by professional manufacturers.

[0023] When performing flue gas purification treatment, all electrolytic cells 10 are sealed with small movable cover plates and upper cover plates, and the flue gas in the cells is connected to the system through the gas collecting hood and the upper connecting branch pipe. The smoke exhaust branch pipe of each electrolytic cell 10 9 are all connected to the outdoor overhead horizontal smoke exhaust sub-dry pipe 7, the smoke exhaust sub-dry pipe 7 converges to the smoke exhaust main pipe 6, and then the smoke exhaust main p...

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Abstract

The invention discloses a purify technology of aluminum electrolyzing FI contained smoke that makes the smoke from electrolyzing FI passing through smoke evacuation branch pipe, smoke evacuation secondary main pipe, smoke evacuation main pipe and smoke evacuation total pipe spraying to impulse purifying filterer. Before coming into the filterer, the two steps material feeding would be taken and take adsorption reaction, and taking filtering and separating in the filterer. One section of the separated alumina containing FI could be used as the raw material to make electrolytic tank, and some would be return to the total pipe to mix with hydrogen fluoride. The purified smoke would be sent to air. The invention has short process, high efficiency, low power consumption, high reliable, no secondary pollution, etc.

Description

Technical field: [0001] The invention relates to a purification process of fluorine-containing flue gas from aluminum electrolysis. Background technique: [0002] The main harmful substances such as fluoride (fluoride 16-25Kg / t.Al) are produced in the production process of the prebaked anode aluminum electrolytic cell, which is a production process that pollutes the air seriously. It usually adopts flue gas dry purification measures, that is, aluminum oxide is used to absorb hydrogen fluoride in flue gas to purify harmful substances in flue gas, control fluoride emissions, so as to meet national environmental protection emission standards and reduce pollution to the surrounding environment. [0003] The dry purification of flue gas from aluminum electrolytic cells utilizes the mechanism that aluminum oxide, the raw material produced by aluminum electrolysis, has a strong adsorption capacity for hydrogen fluoride gas. It is used for dry purification of flue gas containing flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/22B01D53/04
Inventor 刘志玲吕维宁杨凯张树胜邓七一
Owner GUIYANG AL-MG DESIGN & RES INST
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