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Method for recycling lead oxide from lead plaster of waste lead-acid storage battery

A technology of lead-acid batteries and lead oxide, applied in battery recycling, lead monoxide, lead oxide, etc., can solve the problems of increased energy consumption, slow reaction speed, large consumption, etc., and achieve high atom economy, short process flow, The environmental protection effect of the process

Active Publication Date: 2017-12-12
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has obtained high-purity lead oxide and the precipitant has been recycled, this method still requires high-temperature roasting, which increases energy consumption accordingly, and easily produces Pb during roasting. 3 o 4 , the gas produced at the same time has higher requirements on the pressure resistance of the reactor, and the cost is very high
[0005] The Chinese patent application number 201610691120 discloses a method for recovering lead oxide by a full wet method, which can obtain high-purity lead oxide solids without high-temperature roasting, but a large amount of oxidant H is required in this process. 2 o 2 , high price, high consumption, and poor atom economy
[0006] In the Chinese patent application number 201210535154.1, in the process of recovering lead oxide, the utilization rate of atoms is improved, and NaOH is used to process the lead paste, and then cooled to obtain crude lead oxide, which is dissolved in NaOH solution again for recrystallization. Pure lead oxide is obtained, but the reaction speed of this process is slow, recrystallization is required again, and Pb is easily generated 3 o 4

Method used

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  • Method for recycling lead oxide from lead plaster of waste lead-acid storage battery

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Experimental program
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Effect test

Embodiment 1

[0049] according to figure 1 In the process flow shown, take the lead paste of waste lead-acid batteries, then add excess 10wt% NaOH as lye, control the treatment temperature to 35°C, the treatment time to 20min, and the stirring speed to 120rad / min. After the lead plaster is treated with lye, the solid-liquid separation is carried out to obtain the pre-desalted lead paste and the desalted mother liquor mainly composed of sodium acid. After washing the obtained desalted lead plaster, weigh 1 kg of lead plaster and add it to the first reaction kettle, and simultaneously add excessive broken lead grids, 15 g of antimony oxide as a catalyst, a sufficient amount of 0.5 mol / L ethylenediaminetetraacetic acid, Propylenediaminediacetic acid or its sodium salt aqueous solution was used as a complexing agent, and stirred at a constant temperature of 60°C for 2 hours. The mixture obtained after the reaction is filtered and separated to obtain a lead-containing solution and a filter resi...

Embodiment 2

[0052] according to figure 1 In the process flow shown, take the lead paste of waste lead-acid batteries, then add an excess of 15wt% KOH as lye, control the treatment temperature at 45°C, the treatment time is 10min, and the stirring speed is 80rad / min. After the lead plaster is treated with lye, the solid-liquid separation is carried out to obtain the pre-desalted lead paste and the desalted mother liquor mainly composed of sodium acid. After washing the obtained desalted lead plaster, weigh 1 kg of lead plaster and add it to the first reaction kettle, add excessive broken lead grid, 10 g of copper oxide as catalyst, and a sufficient amount of 1mol / L lysine aqueous solution as complexing agent, and stirred for 2 hours at a constant temperature of 80°C. The mixture obtained after the reaction is filtered and separated to obtain a lead-containing solution and a filter residue. Wherein the lead-containing solution is transferred into the second reaction kettle. Stir at a con...

Embodiment 3

[0055] according to figure 1 As shown in the technological process, take the waste lead-acid storage battery lead paste, then add excessive 20wt% NH 4 OH is lye, the treatment temperature is controlled at 25°C, the treatment time is 30min, and the stirring speed is 90rad / min. After the lead plaster is treated with lye, the solid-liquid separation is carried out to obtain the pre-desalted lead paste and the desalted mother liquor mainly composed of sodium acid. After washing the obtained desalted lead plaster, weigh 1kg of lead plaster and add it to the first reaction kettle, add excessive broken lead grid, 15g tin dioxide as catalyst, and sufficient 0.5mol / L tryptophan aqueous solution as catalyst. complexing agent, stirred for 1 hour at a constant temperature of 100°C. The mixture obtained after the reaction is filtered and separated to obtain a lead-containing solution and a filter residue. Wherein the lead-containing solution is transferred into the second reaction kettl...

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Abstract

The invention relates to the technical field of clean recycling of waste batteries and discloses a method for recycling lead oxide from lead plaster of a waste lead-acid storage battery. The method comprises the following steps that (1) pre-desalination is conducted, specifically, the lead plaster of the waste lead-acid storage battery is added with alkali liquor to be subjected to pre-desalination, so that lead acid, lead acetate, lead nitrate, lead perchlorate or lead carbonate in the lead plaster is removed; (2) dissolution is conducted, specifically, a complexing agent solution is added into the lead plaster subjected to pre-desalination, all PbO in the lead plaster reacts with a complexing agent to generate lead complex ions, and a lead-bearing solution and filter residues are obtained; (3) dissociation is conducted, specifically, the pH value of the lead-bearing solution is adjusted by adding a dissociation agent solution, so that the lead complex ions are dissociated, and the PbO and a mixed solution containing the complexing agent and a dissociation agent are obtained; and (4) separating is conducted, specifically, a lead oxide product is obtained after solid-liquid separation and washing. According to the method, the technological condition is mild, the technological process is environmentally friendly, the technological procedure is simple, energy consumption is small, the cost is low, the lead oxide recycling rate is high, the purity is high, and the method has very high industrial application value.

Description

technical field [0001] The invention relates to the cleaning and recovery technology of waste batteries, in particular to a method for recovering lead oxide from lead paste of waste lead-acid batteries. Background technique [0002] Lead is one of the commonly used metals, and its output ranks fourth among non-ferrous metals. According to relevant statistics, the proven reserves of lead in the world are used according to the existing production scale, and after another 20 to 25 years, lead resources will be exhausted. At present, about 68% of lead is used in the production process of lead-acid batteries. After a long-term charge and discharge process, the lead-acid batteries should be discarded when the capacity drops to a very low level or the grid is seriously damaged and cannot be repaired. Most countries in the world, especially western developed countries, attach great importance to the recovery of secondary lead from waste lead-acid batteries. Relevant statistics show...

Claims

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Application Information

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IPC IPC(8): C22B13/00C22B7/00C01G21/06H01M10/54
CPCC01G21/06C01P2006/80C22B7/006C22B13/045H01M10/54Y02P10/20Y02W30/84
Inventor 王江林潘军青马永泉刘孝伟代少振项晨吴鑫
Owner CHAOWEI POWER CO LTD
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