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

A waste lead-acid battery, lead oxide technology, applied in the direction of improving process efficiency, can solve the problems of heavy pollution, low lead recovery rate, environmental pollution, etc., and achieve the effect of low energy consumption and small pollution

Inactive Publication Date: 2009-08-26
DALIAN WUHUATIANBAO TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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

Examples

Experimental program
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Embodiment 1

[0033] This embodiment includes three parts: pretreatment, lead oxide synthesis, by-product recovery

[0034] 1. Pretreatment

[0035] 1.1 After the battery is poured acid, the upper cover is cut off by a cutting machine and the plate is poured out. After acid washing, the plate is sent to the pulverizer, and the grid plate and filler (including lead mud) are obtained by screening after crushing;

[0036] 1.2 The grid plate is directly melted and cast into a finished alloy ingot, and the filler enters the ball mill to be finely ground to 60 mesh, and then enters the lead oxide recovery process.

[0037] 2. Lead oxide recovery

[0038] 2.1 Restoration

[0039] Add the ground filler (including lead mud) to the saturated solution of oxalic acid at room temperature at a ratio of 1:10 (mass:volume), react at 45°C for 1 hour, filter and dry after the reaction is complete.

[0040] Its process chemical reaction formula:

[0041] PbO 2 +H 2 C 2 o 4 →PbO↓+2CO 2 +H 2 o

[004...

Embodiment 2

[0064] The difference from Example 1 is: 2.1 The reduction temperature is 55° C., and a light yellow PbO product is finally obtained with a raw material utilization rate of 91.1% and a yield of 96.2%. Others are the same as in Embodiment 1.

Embodiment 3

[0066] The difference from Example 1 is: 2.1 The reduction temperature is 35° C., and a light yellow PbO product is finally obtained with a raw material utilization rate of 90.4% and a yield of 95.3%. Others are the same as in Embodiment 1.

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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 saturated oxalic 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 to be 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 of raw material is 90.1-92.1%, the yield is 95.0-96.7%, and the content of PbO is 98.0-98.9%.

Description

technical field [0001] 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 [0002] 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. [0003] 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 recovery rate, high energy consumption, heavy ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02E60/12Y02P10/20
Inventor 董振晓
Owner DALIAN WUHUATIANBAO TECH DEV
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