Method and device for purifying electrolytic aluminum smoke

Abstract

The invention relates to a technology for purifying electrolytic aluminum smoke, in particular to a method and a device for purifying electrolytic aluminum smoke. The smoke generated in an electrolytic tank is sucked into an inlet pipeline by the sucking force of a draught fan and distributed into an R-shaped flue by a guide plate and an adjusting door; an outlet of the R-shaped flue is connected with a dust hopper, fresh aluminum oxide enters a delivery chute and is sprayed into the dust hopper under a filter bag by a pneumatic hoister to carry out adsorption reaction with the smoke; the gas and solid separation is carried out by the filter bag of a bag dust remover; fluorine-containing aluminum oxide in a dust hopper boiling bed enters a frequency conversion feeder by the chute, and the aluminum oxide is sprayed into a pipeline at the lower part of the R-shaped flue by a spray hole discharge opening through frequency conversion feeder to carry out adsorption reaction again; the gas and solid separation is carried out by the filter bag of the bag dust remover after the adsorption reaction, the aluminum oxide containing fluoride is filtered and delivered in a fluorine-containing aluminum oxide bin by a fluorine-containing aluminum oxide chute, and the purified smoke is emptied by the fan. The invention improves the adsorbing efficiency on the fluoride by utilizing the R-shaped flue at the lower part of a smoke inlet, simultaneously improves the recycling rate of raw materials, reduces the consumption of the raw materials and has the advantages of good purifying effect and high working efficiency.

Description

technical field [0001] The invention relates to a purification technology for electrolytic aluminum smoke, in particular to a purification method and device for electrolytic aluminum smoke. Background technique [0002] In the production process of electrolytic aluminum, a large amount of fluorine-containing fume will be generated. If it is directly discharged into the atmosphere without purification treatment, it will seriously pollute the environment. For many years, the electrolytic aluminum production has been using the internationally accepted pulse primary purification and back-blowing cloth bag primary purification, that is, the raw material alumina produced by aluminum electrolysis is used as the adsorbent, and the fluoride in the flue gas is adsorbed under given conditions. Part of the fluorine-loaded alumina enters the electrolytic cell as raw material, and the other part enters the reaction section together with fresh alumina, and the purified flue gas is discharg...

AI Technical Summary

Problems solved by technology

One-time adsorption of flue gas, this kind of flue gas purification technology containing fluorine has the problem of uneven feeding of alumina in the chute, which increases the workload of the filter bag, and due to uneven feeding, it will also cause some flue gas The fluoride in the fluoride cannot be fully adsorbed with alumina, which reduces the adsorption and purification efficiency of fluoride, makes the purification effect of flue gas unsatisfactory, and discharges into the atmosphere and causes environmental pollution

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