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Method for producing lead oxide by recovering waste lead-acid batteries based on atom economy way

A lead-acid battery and lead oxide technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficulty in obtaining relatively pure PbO, achieve significant environmental value, improve recovery efficiency, and save huge amounts of energy consumption

Active Publication Date: 2013-06-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing process for preparing lead oxide from regenerated lead, the present invention proposes a new process for designing and researching regenerated lead by adopting atomic economic reaction, and provides a new method for producing high-purity lead oxide by recycling the lead paste of waste lead-acid batteries method
[0007] The second technical problem to be solved by the present invention is to overcome the disadvantage that the existing process is difficult to obtain relatively pure PbO, and to provide a preparation process for preparing high-purity PbO with waste lead plaster or lead-containing substances

Method used

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  • Method for producing lead oxide by recovering waste lead-acid batteries based on atom economy way

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Get 2 pieces of 12V, 12Ah ordinary electric vehicle waste lead-acid batteries purchased on the market, and the total weight of the battery pack is 9.2 kg. The specific implementation process is as follows:

[0027] (1) After routine crushing and separation of waste lead-acid batteries, lead paste, grids, waste sulfuric acid, separators and casings are obtained.

[0028] (2) Pulverize the separated lead paste and sieve it with a 120-mesh stainless steel screen. Larger lead paste particles will continue to be transferred to the pulverizer for crushing until all the lead paste passes through the screen.

[0029] (3) After the waste grid is crushed, it is screened with a 120-mesh stainless steel screen, and the larger lead particles continue to be transferred to the crusher for crushing until all the lead particles pass through the screen for later use.

[0030] (4) Prepare NaOH solutions with concentrations of 3mol / L (density 1.12g / ml), 8mol / L (density 1.28g / ml) and 10mol...

Embodiment 2

[0040] (1) Obtain crushed lead paste and lead powder, and recovered NaOH mother liquor A, mother liquor B and mother liquor C according to Example 1.

[0041] (2) Mix 0.96 kg of lead paste and 0.04 kg of lead powder in solid phase, then heat to 390°C for 15 minutes of redox reaction to obtain 0.99 kg of a mixture mainly containing lead oxide and lead sulfate;

[0042] (3) Desulfurize the reaction product obtained in the process of (2) in 500ml of mother liquor A, maintain the reaction conditions of 150 rpm stirring speed and constant temperature of 50°C, and filter after 10 minutes of reaction to obtain lead oxide-based filter residue and filtrate A;

[0043] (4) Put the filter residue of step (3) into 13 liters of mother liquor B, and heat at 110°C, so that all the lead oxide in the filter residue is dissolved in mother liquor B;

[0044] (5) Filtrate the mother liquor B in the process of (4) while it is hot to obtain filtrate B and filter residue dissolved with lead oxide; ...

Embodiment 3

[0050] (1) Take 2 kg of the paste slurry on the lead-acid battery plate discarded in the lead-acid battery workshop and put it into a pulverizer for continuous crushing and screening to obtain a 120-mesh lead paste powder.

[0051] (2) Prepare 100 liters of NaOH solution with a concentration of 3.3mol / L (density 1.121g / ml), 10mol / L NaOH solution containing 30g / L PbO (density 1.331g / ml) and 11mol NaOH solution containing 35g / L PbO The NaOH solution (density 1.35g / ml) of / L is recorded as NaOH solution A, B and C respectively, is put in the bucket for subsequent use;

[0052] (3) Mix 2 kg of lead plaster and 0.1 kg of lead powder, then heat to 500°C for 9 minutes for redox reaction to obtain 2.08 kg of solid mixture mainly composed of lead oxide and lead sulfate;

[0053] (4) Desulfurize the reaction product obtained in (3) in 1 liter of NaOH solution A, maintain the reaction conditions of 150 rpm stirring speed and constant temperature of 50 ° C, react for 5 minutes and filter ...

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Abstract

The invention provides a method for producing lead oxide by recovering waste lead-acid batteries based on an atom economy way and belongs to the field of chemical industry for clearing and recovering waste lead-acid batteries. The method comprises the steps of: heating lead paste and lead powder of the lead-acid batteries, and then carrying out solid phase mixing reaction, sodium hydroxide alkaline desulfurization and sodium hydroxide leaching to directly obtain a lead-bearing alkaline solution and filter residue; and carrying out purification and cooling crystallization on the solution so as to obtain high-purity lead oxide and a by-product sodium sulfate so as to eliminate the defect that a large quantity of chemical raw materials are required to be consumed in a conventional synthesis process of the lead oxide so that the method is a clean and energy-saving new technology and has a large-scale industrial application prospect.

Description

technical field [0001] The invention relates to a method for recovering regenerated lead, which belongs to the field of chemical industry for cleaning and recovering waste lead-acid batteries. Background technique [0002] With the rapid development of social economy, lead-acid batteries have maintained an average annual growth rate of 4.7% in traditional cars, electric bicycles and blue-drive cars with automatic start-stop technology due to their advantages of low price and stable technology. According to statistics from the International Lead-Zinc Research Group, the global output of refined lead reached 10.62 million tons in 2012, of which more than 80% was used in the manufacturing process of lead-acid batteries, while the consumption of lead in my country reached more than 3.7 million tons. It can be expected that in the future, we will face increasingly serious and larger quantities of waste lead-acid battery recycling problems. [0003] Although the use of lead-acid ...

Claims

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Application Information

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IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 潘军青宋爽马亚强孙艳芝钮因健
Owner BEIJING UNIV OF CHEM TECH
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