Method for recycling lead plaster from waste lead storage battery

Abstract

The invention discloses a method for recycling lead plaster from a waste lead storage battery. The method is implemented by the following steps of: (1) crushing the lead plaster separated from the waste lead storage battery into particle sizes of 160 to 220 meshes; (2) adding the crushed lead plaster into saturated solution of NH4HCO3, reacting the lead plaster with the solution of NH4HCO3 under stirring to convert lead sulfate in the lead plaster into lead carbonate, and stopping reaction; (3) performing suction filtration, washing a filter cake to be neutral by using distilled water to obtain a wet product, placing the wet product into a drying oven for drying under the condition of 150 DEG C to obtain a sample, and adding NH4HCO3 into filtrate until the mixed solution is saturated for the treatment of lead plaster of the next batch; and (4) heating the sample obtained by the step (3) to 250 to 350 DEG C, preserving heat for 1 to 1.5h to completely dissolve lead dioxide into lead oxide, heating the sample to 350 to 450 DEG C, and preserving the heat for 3 to 4h to completely dissolve the lead carbonate to obtain yellow lead.

Description

technical field [0001] The invention relates to a method for recycling waste lead storage batteries, in particular to a method for recycling lead paste in waste lead storage batteries. Background technique [0002] my country's secondary lead industry has gradually developed under the condition of emphasizing environmental protection and resource comprehensive utilization policy requirements. With the rapid development of my country's automobile, communication and chemical industries, the requirements for lead continue to increase, and the secondary lead industry has become an indispensable and important part of the sustainable development strategy of the lead metal industry. [0003] At the same time, lead is a metal harmful to the environment and human health. If various lead wastes are not recycled, they will become a source of environmental pollution. Especially for waste batteries, only when they are fully recycled can the lead paste and sulfuric acid in them be avoide...

AI Technical Summary

Problems solved by technology

The mass content of lead sulfate in lead paste reaches 40%-80%. The current process of converting PbSO4 in lead paste to lead carbonate is to combine lead paste with carbonate or acid carbonic acid Salt converts PbSO4 into lead carbonate. During the conversion, various additives are added to the carbonate or acid carbonate, but the conversion rate is still only 85%-90%, which leads to the reduction due to conversion There is still a small amount of PbSO4 in the final lead paste, so the temperature in the general furnace cannot be lower than 1000°C. On the one hand, a large amount of metal iron filings still need to be added in the reduction production process to reduce PbSO4PbS generated after thermal decomposition; on the other hand, since most of the materials in the converted lead paste are PbCO3, PbO, PbO2, when these materials are at 800℃, It is already in a molten state, which will inevitably lead to a situation of high energy consumption for smelting and a large amount of lead volatilization. This part of the volatilization amount is not less than 5% of the total metal content. The lead volatilized during the process of smelting, feeding, stirring, and discharging In the form of gas, all of them are scattered in the air around the secondary lead enterprises, and the existing cover-type bag dust collectors are difficult to collect, thus causing serious lead pollution

Serious harm to the environment and the health of workers