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Lead plaster acidic solid-phase electrolysis method

A technology of solid-phase electrolysis and lead paste, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems that affect the promotion of industrialization, the difficulty of reducing the tank pressure, and the short circuit of cathode and anode, so as to reduce the labor intensity of tank management and reduce the Groove pressure, reduce the effect of the same polar distance

Pending Publication Date: 2019-12-03
沈阳鑫迪环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned alkaline electrolysis method can achieve high current density, and the technology is mature and stable. However, lead oxides dissolve on the alkali and precipitate on the cathode, which may easily cause a short circuit between the cathode and the anode. Therefore, it is not suitable to use electrolysis with a small homopolar distance, which makes it difficult to reduce the tank pressure, and The high cost of alkali consumption affects the industrialization of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Cut the 2mm thick 304 stainless steel plate into strips and weld the cathode frame, and the processing size is 60×90×30mm; take the 1mm thick lead-calcium alloy plate and cut it into two pieces of 60×120mm as the anode plate; take the waste lead from the battery coating plate Paste, (it can also be other waste lead paste) adjusted to a mass content of 20% water, filled into the cathode frame, the prepared cathode plate 60 × 90 × 30mm, the filling amount of lead paste is 360g; in a 1000ml beaker Pour density 1.05g / cm 3 Add 10ml of phosphoric acid to the waste sulfuric acid solution, put the cathode and anode plates in, and the liquid level is 10mm higher than the cathode plate; the cathode is connected to the negative pole of the rectifier, and the anode is connected to the positive pole of the rectifier. It gradually increases from small to about 6.8A. When it reaches about 6.8A, the current fluctuation becomes smaller and decreases slowly after a period of time. After ...

Embodiment 2

[0020] Using the cathode and anode plates in the above example, the filling amount of lead paste is the same, and poured into a 1000ml beaker with a density of 1.10g / cm 3 Add 10g of anhydrous sodium sulfate to the waste sulfuric acid solution, put the cathode and anode plates into the beaker, and the liquid level is 10mm higher than the cathode plate; connect the plates to the rectifier, check the cathode and anode connections, and then send power, adjust the current to 4.5A, start The voltage is high, then drops rapidly, and when it reaches about 2.4V, it tends to be stable and maintains for a period of time. All lead compounds in lead paste are reduced to metallic lead.

Embodiment 3

[0022] Cut the 2mm thick 304 stainless steel plate into strips and weld two cathode frames, the processing size is 300×450×30mm; take the 2mm thick lead-antimony alloy plate and cut it into three pieces of 320×500mm as the anode plate; take the waste battery Peel off the lead paste from the plate and crush it, adjust the water content to 18%, and fill it into the cathode frame. The filling amount of the lead paste is 9.5kg; pour it into a 500×800×600mm electrolytic cell beaker with a density of 1.10g / cm 3 Put the cathode and anode plates into the waste sulfuric acid solution, and the liquid level is 10~20mm higher than the cathode plate; connect the plates to the rectifier, check the connection between the cathode and anode, and then send power, adjust the tank voltage to 2.45V, and gradually increase the current from small to small , When the limited current reaches 300A, the limited current is electrolyzed and maintained for a period of time, and then slowly decreases. After ...

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Abstract

The invention provides a lead plaster acidic solid-phase electrolysis method which is characterized in that lead plaster with adjusted moisture is loaded into a cathode frame to serve as a cathode, alead alloy plate serves as an anode, the cathode and the anode are arranged at intervals and placed into an electrolytic cell, dilute sulfuric acid serves as electrolyte, direct current is supplied, and various lead compounds in the lead plaster are completely reduced into metal lead. The method solves the problems that in the prior art, a large number of sulfate radicals in the lead plaster consume high-valence alkali to generate low-valence sulfate in the alkaline electrolysis process, and the alkali consumption and sulfate recovery enable the production cost to be greatly improved. The costcan be eliminated by adopting acidic solid-phase electrolysis, so that the overall cost is reduced. Acidic electrolysis is adopted, dilute acid salt is used for replacing sodium hydroxide in electrolyte, the electrode material is adjusted, the production cost can be greatly reduced, and economic benefits are improved.

Description

technical field [0001] The invention relates to an acidic solid-phase electrolysis method for lead paste, belonging to the technical field of metallurgy and environmental protection. Background technique [0002] In the field of metallurgical environmental protection technology, solid-phase electrolysis technology usually adopts alkaline electrolysis. When lead paste is recovered by alkaline solid-phase electrolysis, all the sulfate radicals in the lead paste will be converted into sulfate and consume a large amount of alkali. The energy consumption of sulfate recovery It is also higher, making the recovery cost of this technology higher. [0003] At present, the industrial application of solid-phase electrolysis technology is mainly used for the disposal of lead powder in the recycling of lead from waste lead-acid batteries. The lead powder is adjusted to moisture and paste, and coated on the cathode plate, which is used as the cathode and stainless steel as the anode. Ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/18C25C7/02
CPCC25C1/18C25C7/02
Inventor 佟永顺张正洁
Owner 沈阳鑫迪环境技术有限公司
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