Method for recovering lead oxide by waste lead-acid storage battery

Abstract

A method for recovering lead oxide by a waste lead-acid storage battery is disclosed. The waste lead-acid storage battery is crushed together with lead slime subsequent to acid cleaning, a grid plate and a filler comprising the lead slime are obtained by screening, the grid plate is fused-cast to an alloy ingot, the filler and the lead slime are ball-milled, and fine stuff is added with saturatedoxalic acid solution for reaction at 25-65 DEG C and then for filtering and depositing; the deposition is then treated by excessive 30% nitric acid at the temperature of 40-45 DEG C for subsequent filtration and deposition, and the deposition is reacted with 4wt% sal volatile at the temperature of 25-65 DEG C for subsequent filtration and deposition; the deposition is added into recovered HNO3 tobe dissolved at the temperature 40-45 DEG C until no bubble is generated, the filtered filtrate is added with 25% ammonia for reaction, filtration, washing and deposition to be neutral, and the lead oxide is obtained by drying and roasting. Recoverable nitramine and ammonium sulfate are recycled in all the filtrates in the technologies; thereby discharging no waste liquid. The utilization rate ofraw material is 90.1-92.1%, the yield is 95.0-96.7%, and the content of PbO is 98.0-98.9%.

Description

Method for recovering lead oxide from waste lead-acid batteries technical field The invention relates to the field of recycling of waste lead-acid batteries, in particular to the technical field of production of lead oxides, in particular to the technology of recycling lead slime that pollutes the environment. Background technique Lead has a wide range of uses, and its annual output ranks fourth among non-ferrous metals after aluminum, copper, and zinc. In order to save limited mineral resources and avoid environmental pollution caused by waste lead materials, the recycling and utilization of waste lead materials are attached great importance both at home and abroad. Recovering lead from waste lead-acid batteries has always been a technical problem. At present, the methods of recycling lead from waste batteries in China mostly use traditional fire processes such as reverberatory furnaces and water jacket furnaces to smelt lead by fire. Mainly manifested in low lead reco...

AI Technical Summary

Problems solved by technology

Mainly manifested in low lead recovery rate, high energy consumption, heavy pollution, etc., it is difficult to meet environmental protection requirements

Its smelting temperature is high, about 1200°C. The lead dust, lead vapor, lead slag and sulfur dioxide produced by the high temperature have caused serious pollution to the environment. At the same time, this method also has the problem of low lead recovery rate, which generally can only reach about 85%

There is no report on the processing technology of recovering lead oxide from waste batteries

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