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Lead regeneration method for recovering lead paste from waste lead acid storage battery by wet method

A technology of waste lead-acid batteries and lead-acid batteries, which is applied in the field of regenerated lead in lead paste, can solve the problems of physical poisoning of operators, difficulty in industrialization of power consumption, and obstruction of industrialization, so as to achieve high lead recovery rate and avoid the loss of lead , The effect of reducing the cost of raw materials

Active Publication Date: 2012-08-01
北京绿色引领环保科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] (2) consume a large amount of desulfurizer (NaOH or Na 2 CO 3 ) converts lead sulfate to soluble Pb(OH) 2 or PbCO 3 ;
[0018] (3) Electrolysis of Pb(BF 4 ) 2 or PbSiF 6 solution to get Pb and O 2 It is easy to produce a large amount of toxic acid mist containing HF, which brings poison to the operator's body
[0022] Although the acidic solid-phase electrolysis method can obtain lead powder and sulfuric acid by electrolysis, the power consumption of up to 1000 degrees is the main problem that it is difficult to industrialize
Alkaline solid-phase electrolyte can save nearly half of the electrolytic power, but the lead powder with high specific surface area obtained in the alkaline electrolysis process is very easy to be oxidized again and lost during the melting process, which is a problem hindering its industrialization

Method used

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  • Lead regeneration method for recovering lead paste from waste lead acid storage battery by wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take the 12V, 10Ah lead-acid battery for ordinary electric vehicles retailed on the market, and the battery pack weighs 4.3 kg. The specific implementation process is as follows:

[0050] 1) The battery is conventionally crushed and separated to obtain lead paste, grids, waste sulfuric acid, separators and shells.

[0051] 2) Put 2 kg of lead paste into a 10L reactor containing 2.2mol / L of HClO 4 and 8g / L of chloroacetic acid, followed by constant temperature and stirring at 75°C for 2 hours. During this process, lead dioxide, lead powder, and lead oxide in the lead paste are gradually converted into lead perchlorate under the catalysis of chloroacetic acid. When the measured lead ion concentration reaches 1.5-1.6mol / L, the reaction is stopped, and the mother liquor in the reactor is transferred to a filter press for pressure filtration separation to obtain filter residue A and lead-containing solution B.

[0052] 4) The lead-containing solution B enters the electrol...

Embodiment 2

[0056] Take a common 12V, 45Ah car battery on the market, and the total weight of the battery pack is 13.5 kg. The specific recycling process is as follows:

[0057] 1) The lead paste obtained after the lead-acid battery is crushed and separated is used for standby.

[0058] 2) Prepare 45L acidity containing 2.5mol / L methanesulfonic acid and 3g / L chloroacetic acid, then add 8 kg of lead paste powder obtained in step 1, and then keep constant temperature and stir at 75°C for 6 hours. During this process, the lead dioxide of the original positive electrode and the lead powder of the original negative electrode in the lead paste are gradually converted into soluble lead methanesulfonate under the catalysis of chloroacetic acid, and the lead sulfate in the lead paste remains in the form of precipitation.

[0059] 3) Filtrate and separate the mother liquor in process 2 to obtain filter residue A and lead-containing solution B.

[0060] 4) Take 40L of filtrate and add 100g of bone...

Embodiment 3

[0064] Get 5 kilograms of ordinary waste lead-acid battery positive and negative plates and pulverize to obtain lead paste powder. The specific recovery process is as follows: 1) the waste lead oxide powder and 30L of 2.5mol / L HClO 4 Solution, while adding 150g of ammonium acetate as a catalyst, the reaction was stirred at 80°C. The lead analysis test shows that the concentration of lead ions tends to be stable after 3 hours of reaction. Press filtration is then carried out to obtain filter residue A and lead-containing solution B.

[0065] 2) Add 0.5g / L gelatin and 1.5g / L sodium lignosulfonate to the lead-containing solution B as electrodeposition additives to improve the cathode process. After static purification, the electrolyte enters the electrolytic cell and is electrolyzed at 55°C.

[0066] 3) Carry out electrolysis in the electrolyzer of embodiment 2, at first carry out the constant current electrolysis of the first stage, control current density is 200A / m 2 , The v...

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Abstract

The invention discloses a lead regeneration method for recovering lead paste from a waste lead acid storage battery by a wet method, and belongs to the field of lead regeneration from the lead paste of the waste lead acid battery. The lead regeneration method comprises the following steps of: adding the lead paste into an acid liquor reaction kettle containing a catalyst to perform oxidation reduction reaction on lead and lead dioxide in the lead paste to obtain soluble lead salt solution; meanwhile, reacting lead oxide with acid to obtain lead salt; separating to obtain insoluble filter residue mainly containing soluble lead salt solution and lead sulfate; and electrolyzing the lead salt solution to obtain lead, oxygen and acidic electrolyte, wherein the electrolyte can be returned to a leaching process for recycling, and the filter residue A is treated by the conventional reselection process to obtain the lead sulfate and the filter residue D. According to the lead regeneration method, the production cost is reduced, and high comprehensive lead recovery rate is obtained.

Description

technical field [0001] The invention belongs to the field of regenerated lead for lead paste of waste lead-acid batteries. The invention relates to a novel energy-saving and high-efficiency wet method for regenerating lead, which provides a new technology capable of large-scale industrial application for the regenerated lead industry. Background technique [0002] With the vigorous development of my country's automobile and other technologies, the demand for lead-acid batteries is increasing day by day. According to statistics, my country's lead consumption reached 3.5 million tons in 2010. It can be predicted that a large number of lead-acid batteries will enter the end-of-life stage in the next few years. How to effectively carry out the recycling and reproduction of waste lead-acid batteries will be the basic way to reduce environmental pollution and realize the sustainable development of lead resources. [0003] According to statistics, lead in lead-acid batteries main...

Claims

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Application Information

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IPC IPC(8): C25C1/18
CPCY02P10/20
Inventor 潘军青王田钮因健孙艳芝
Owner 北京绿色引领环保科技研究院有限公司
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