Method for recovering lead from waste lead acid batteries

A technology for recycling waste storage batteries and lead, which is applied in photography technology, instruments, photography auxiliary technology, etc., can solve the problems of long electrolysis time, high production cost, and many side reactions, and achieves short electrolysis time, low production cost, and lead compounds. less residual effect

Inactive Publication Date: 2010-06-23
江苏航虹电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above-mentioned characteristics, it is determined that they can only reclaim lead with small current and high electrolysis voltage (up to 3.5 volts), resulting in many side reactions, large energy consumption, long electrolysis time and high production costs

Method used

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  • Method for recovering lead from waste lead acid batteries
  • Method for recovering lead from waste lead acid batteries
  • Method for recovering lead from waste lead acid batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: lead-containing waste powder is obtained after waste lead storage battery is processed mechanically, and its composition is lead oxide 7.80%, lead sulfate 51.74%, metallic lead 6.59%, lead dioxide 33.79%. Put the waste lead powder into the waste sulfuric acid obtained from the waste lead battery, heat it at 140°C to reduce the lead dioxide to low-priced lead compounds, and then prepare the low-priced lead compounds with 0.1% polyvinyl alcohol and 10% water Make a paste and apply it on a metal mesh to make a paste-type cathode 5 with a thickness of about 3mm, and then assemble the paste-type cathode 5, separator 4, and anode 3 into a Figure 1 The electrolysis pile shown, and make it carry out electrolysis in 2N sodium hydroxide solution at room temperature, and current density is 50-30 A times / kg waste material, and electrolysis voltage is 1.5-2 volts, completes through 4-5 hours electrolysis, and cathode becomes Sponge lead plate, which contains about 2% ...

Embodiment 2

[0018] Embodiment 2: The waste material to be recovered is the waste lead ash of the lead storage battery factory, and the composition is mainly lead oxide and about 15% lead sulfate, and the remainder is a small amount of metallic lead. This kind of waste does not require mechanical treatment and reduction treatment. Directly make a paste-type cathode with a thickness of about 3 mm as in Example 1 and assemble it into an electrolytic stack. Electrolysis was performed in 2N sodium hydroxide at room temperature. The electrolysis voltage is 1.4-2 volts, the cathode current density is 50-40 ampere / kg waste, and the electrolysis is completed in about 4 hours. The cathode gets a sponge lead electrode. It contains 2-1.5% lead sulfate, 97-98% lead, and 94% cathode current efficiency.

[0019] The post-processing of the sponge lead plate and the lead-containing parts obtained by mechanically processing waste batteries in the above embodiments is to put them into a lead-melting furn...

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Abstract

The present invention relates to a method for recovering lead from waste lead acid batteries. The electrolytic device adopted comprises an electrolytic bath, dilute alkali electrolyte, an anode, a baffle and a pasted cathode. The anode, the baffle and the pasted cathode are arranged in a tight assembly structure. The pasted cathode is prepared from waste lead powder processed by reduction, water and paste. Lead is reduced from the pasted cathode with a solid phase reduction electrolytic method. Besides the advantage of no pollution, the present invention also has the advantages of short electrolysis time, low energy consumption and low production cost due to the characteristics of low electrolysis voltage, large current density and high current efficiency.

Description

technical field [0001] The present invention relates to the recovery of waste metals, in particular to a method for the recovery of lead from waste accumulators in electrolytic equipment. Background technique [0002] There are two methods for recovering lead from waste batteries: "fire method" and "wet method". "Fire method" is adopted by domestic manufacturers. This method is backward in technology (such as: the recovery process must be carried out at about 1000 ° C), the recovery rate is low, and it pollutes the environment - lead fume and poisonous gas (such as: sulfur dioxide, chlorine, etc.) will be produced during the smelting process. ). "Wet method" is a non-polluting lead recovery method, which can be divided into "alkaline method" and "acid method" according to the type of electrolyte medium used. The two methods can be referred to the U.S. Patent US4107007 and US4597841 documents respectively: the former is a kind of "suspension electrolysis", which is characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C25C1/18
CPCY02P10/20
Inventor 陈步高
Owner 江苏航虹电源有限公司
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