A sulfuric acid dechlorination system for waste lead-acid batteries and its dechlorination method

Abstract

The invention discloses a sulfuric acid dechlorination system for a scrapped lead acid battery and a dechlorination method utilizing the dechlorination system and belongs to the technical field of waste sulfuric acid recovery of lead acid batteries. The problem that chloride ions cannot be removed during membrane filtration recovery is mainly solved. The sulfuric acid dechlorination system is mainly characterized by comprising a filter, a dechlorination device and an acid storage tank, wherein the dechlorination device comprises an electrolytic cell, a cathode electrode, an anode electrode, anelectrolytic power supply and a gas insulation plate; a hydrogen outlet and an oxygen outlet are formed in a top cover of the electrolytic cell; the hydrogen outlet is sequentially connected with anacid mist remover, a hydrogen gas compressor and a hydrogen storage tank; the oxygen outlet is sequentially connected with a dechlorination tower, an oxygen compressor and an oxygen storage tank. Electrolytic lead is selected as the electrode material, corrosion resistance is excellent, and the service life of the electrode can be prolonged. Moreover, the device is applied to lead acid battery recovery plants, and the electrolytic lead material is readily available. The sulfuric acid dechlorination system disclosed by the invention has the characteristics of being simple, rapid, low in cost and excellent in dechlorination ability, and is mainly used for removing chloride ions in waste acid of the lead acid battery recovery plants.

Description

technical field [0001] The invention belongs to the technical field of recovery of waste sulfuric acid from lead-acid batteries, and in particular relates to a sulfuric acid dechlorination system for waste lead-acid batteries and a chlorine removal method using the same, which can be used to remove chlorine ions in waste acid in lead-acid battery recycling plants. Background technique [0002] Currently, waste sulfuric acid from lead-acid batteries is recovered by membrane filtration, but there are remaining problems: chloride ions cannot be removed. Therefore, other technologies are needed to remove chloride ions in waste sulfuric acid. The main dechlorination technologies are: 1) The traditional chemical method is to add silver sulfate and filter to remove chloride ions in waste sulfuric acid, but the cost of silver sulfate used is high, and flocculants need to be added to form large particles of precipitation, which will Bringing in impurities, poor operability in indust...

AI Technical Summary

Problems solved by technology

[0002] Membrane filtration is used to recover waste sulfuric acid from lead-acid batteries, but there are remaining problems: chloride ions cannot be removed

The main dechlorination technologies are: 1) The traditional chemical method is to add silver sulfate and filter to remove chloride ions in waste sulfuric acid, but the cost of silver sulfate used is high, and flocculants need to be added to form large particles of precipitation, which will Bringing in impurities, poor operability in industrial production; 2) Electrodialysis, electrodialysis technology is mainly used in the preparation of pure water, there is no case in sulfuric acid medium conditions, and the cost of electrodialysis is high

The above methods have limitations. The method used in this system is the method of electrolysis. During the use of lead-acid batteries, the whereabouts of chloride ions are studied. It is concluded that under electrolysis conditions, chloride ions will enter the gas phase from the sulfuric acid in the electrolyte as chlorine gas.

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