Recycling system and method for lead plaster of waste lead-acid storage battery

Abstract

The invention discloses a recycling system and method for lead plaster of a waste lead-acid storage battery. The system comprises an inert gas storage tank, a slurrying reaction tank, a waste acid andwastewater treatment system, a filtering device and a regenerated lead plaster storage tank which are sequentially communicated, wherein the waste acid and wastewater treatment system is communicatedwith a gas outlet of the slurrying reaction tank; the filtering device and the regenerated lead plaster storage tank are sequentially communicated with a discharge hole of the slurrying reaction tank; and a hydrogen storage tank is communicated with the slurrying reaction tank. The method comprises the following steps of conducting slurrying treatment on the collected lead plaster of the waste lead-acid storage battery, and then introducing inert gas to remove air; and then introducing hydrogen to treat lead sulfate, and conducting solid-liquid separation to obtain new lead plaster. Accordingto the system and the method, a mixture containing elemental lead and lead oxide can be obtained without large equipment, high-temperature treatment and a large number of chemical reagents for treatment of the lead plaster of the waste lead-acid storage battery, the mixture can be directly used for new ingredients of the lead plaster of the lead-acid storage battery, the generated hydrogen sulfide is used for recycling metal ions in waste acid and wastewater, recycling of various resources is achieved through simple operation, and good social and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of battery lead paste recycling, and in particular relates to a waste lead-acid battery lead paste recycling system and a recycling method thereof. Background technique [0002] Lead-acid batteries are widely used not only in transportation, electric power, communication and other fields, but also in the fields of solar energy, wind energy and electric vehicles, which are widely used, and thus produce a large number of scrapped lead-acid batteries. The production of a large number of waste lead-acid batteries has brought great harm to the environment and health, so the recycling of waste lead-acid batteries has become a research hotspot in this field. [0003] After the waste lead-acid battery is disassembled, the waste plastic shell, waste sulfuric acid, waste plate, waste grid and waste lead paste are mainly separated. The weight of waste lead paste accounts for 50%-60% of the weight of the entire battery....

AI Technical Summary

Problems solved by technology

Among them, the pyrometallurgical process is currently the more mainstream treatment method. Various types of pyrometallurgical furnaces such as converters, bottom-blown furnaces, and side-blown furnaces are used to carry out high-temperature melting and reduction of lead paste, and finally the elemental metal lead is used as the product. This method can obtain purity Higher elemental lead metal can realize the recovery of lead paste, but the whole process of smelting in this method is high temperature, high energy consumption, and the process flue gas contains lead vapor, which is difficult to recover SO 2 flue gas, making the SO in the tail gas 2 The absorption treatment further increases the complexity of the process. Therefore, the flue gas discharged from the pyroprocessing process contains unavoidable harmful gases, and the energy consumption is large and the cost is high.

The wet process includes chemical methods and electrochemical methods. Electrochemical methods have a high recovery rate of lead and can effectively eliminate lead and SO 2 and other impacts on the environment, but the labor cost is high, the power consumption is large, and the processing cost is high

However, chemical methods need to use a large amount of chemical reagents, and secondary waste will appear, which not only consumes a large amount of chemical reagents, but also increases the post-treatment process of secondary waste, reducing the social and economic benefits of the lead paste recovery process.

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