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Method for recovering lead in waste lead-acid storage battery filler by using wet process

A technology of waste lead-acid battery and wet method, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of long process, great harm to human body and environment, and low lead recovery rate, so as to improve the direct recovery rate, The effect of improving electrolysis efficiency and simplifying the process flow

Inactive Publication Date: 2014-11-05
HENAN UNIV OF SCI & TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of low lead recovery rate, long process, and great harm to the human body and the environment in the prior art when dealing with waste lead-acid batteries, the present invention provides a wet recovery method for lead in waste lead-acid battery fillers

Method used

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  • Method for recovering lead in waste lead-acid storage battery filler by using wet process

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Effect test

Embodiment 1

[0038] Weigh 150 g of sodium hydroxide (analytically pure), add 180 g of xylitol (food grade) into 1.5 L of water, stir and dissolve to obtain a solution for leaching, and use the lead paste part selected after the waste lead-acid battery is broken as the leaching raw material. After drying and grinding, pass through a 200-mesh sieve, and add 200 g to the obtained solution for leaching. Stir magnetically at 85°C for 4 h, filter, and the filtrate is the electrolyte, in which the concentration of lead ions is 92 g / L. The electrolysis temperature was controlled at 45°C, the current density was 200 A / m2, and the pole distance was 4 cm. Both the cathode plate and the anode plate were stainless steel plates with an area of ​​9.7 cm×9.9 cm. The electrolyte circulation rate was 30 mL / min, and the electrolysis time was 10 h. The average cell voltage is 1.62V, the current efficiency is 96.12%, and the cathode energy consumption is 436.07 kWh / t Pb. The cathode lead purity is higher than...

Embodiment 2

[0040] Weigh 200 g of sodium hydroxide (analytical pure), add 180 g of xylitol (food grade) into 1.5 L of water, stir and dissolve to obtain a solution for leaching, and use the lead paste part selected after the waste lead-acid battery is broken as the leaching raw material. After drying and grinding, pass through a 200-mesh sieve, and add 250 g to the obtained solution for leaching. Stir with magnetic force at 75°C for 4 h, filter, and the filtrate is the electrolyte solution, in which the concentration of lead ions is 115 g / L. The electrolysis temperature was controlled at 50°C, the current density was 250 A / m2, and the pole distance was 4 cm. Both the cathode plate and the anode plate were stainless steel plates with an area of ​​9.7 cm×9.9 cm. The electrolyte circulation rate was 25 mL / min, and the electrolysis time was 10 h. The average cell voltage is 1.70V, the current efficiency is 96.52%, and the cathode energy consumption is 455.70 kWh / t Pb. The cathode lead purity...

Embodiment 3

[0042] Weigh 150 g of sodium hydroxide (analytically pure), add 180 g of xylitol (food grade) into 1.5 L of water, stir and dissolve to obtain a solution for leaching, and use the lead paste part selected after the waste lead-acid battery is broken as the leaching raw material. After drying and grinding, pass through a 200-mesh sieve, and add 200 g to the obtained solution for leaching. Stir magnetically at 85°C for 4 h, filter, and the filtrate is the electrolyte, in which the concentration of lead ions is 92 g / L. The electrolysis temperature was controlled at 55°C, the current density was 400 A / m2, and the pole distance was 4 cm. Both the cathode plate and the anode plate were stainless steel plates with an area of ​​9.7 cm×9.9 cm. The electrolyte circulation rate was 30 mL / min, and the electrolysis time was 10 h. The average cell voltage is 1.85V, the current efficiency is 97.45%, and the cathode energy consumption is 491.18 kWh / t Pb. The cathode lead purity is higher than...

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Abstract

The invention relates to a method for recovering lead in a waste lead-acid battery filler by using a wet process, which comprises the following steps of: taking and adding sodium hydroxide and xylitol into water, agitating and dissolving at a normal temperature to prepare mixed solution; adding obtained lead paste powder in the mixed solution, reacting for 1-5 hours and taking a filtered filtrate as an electrolyte; adopting a pure lead plate or a stainless steel plate as a cathode; and adopting the stainless steel plate as an anode and switching on direct current for electrolysis. The method has the beneficial effects that the method of directly leaching lead paste is adopted; the processes of desulfurization and reductive transformation are not required, so that the process flow is simplified; the sodium hydroxide and xylitol solution are adopted when the lead paste is leached and can form a compound with lead oxide to leach the lead in the lead paste to a utmost extent, so that the sulfur dioxide and various smoke and dust generated in the pyrometallurgical recovery process are avoided, and the straight yield of the lead is improved; and volatile smoke and dust or acid mist can not be generated, so that the defect that a silicon fluorine acid electrolyte pollutes the environment and is harmful to human health is overcome.

Description

technical field [0001] The invention relates to the field of metal lead recovery, in particular to a method for wet recovery of lead in fillers of waste lead-acid batteries. Background technique [0002] With the rapid development of the automobile and communication industries, the demand for lead-acid batteries continues to increase. At the same time, a large number of lead-acid batteries are scrapped every year, forming a huge amount of lead-containing solid waste, which is also an important secondary lead resource. Waste batteries, especially lead paste (the main components are PbO, PbO 2 , PbSO 4 and a small amount of Pb, Sb), if not recycled, will endanger human health and cause great pollution to the environment. [0003] The recovery of lead from waste lead-acid batteries includes the remelting and refining of lead and lead alloys in the grid part and the recovery of filler (lead paste). The filler is mainly the slurry-like substance formed after charging and disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/18C22B3/12
CPCY02P10/20
Inventor 刘伟周琼华苌清华王喜然肖发新李杰段延国郭旗
Owner HENAN UNIV OF SCI & TECH
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