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Method for producing lead by executing electrolysis and alkaline leaching on lead sulfate material

A technology of lead sulfate and materials, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of complex structure of solid-phase electrolysis equipment, lengthy process, difficult handling of multi-metal mixed materials, etc., and achieve low alkali consumption, The effect of short process flow and high recovery rate

Active Publication Date: 2012-05-23
GREENNOVO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, there are many hydrometallurgical methods for producing metallic lead from lead sulfate materials at home and abroad, mainly including carbonate conversion-fluorosilicate leaching-electrowinning and solid-phase electrolysis. The defects of these methods are mainly limited to the use of Process lead sulfate materials with relatively pure composition and high lead content, such as lead-acid battery paste, etc., but it is difficult to process materials with complex components and mixed metals; at the same time, the former method has a lengthy process, while the latter method uses solid-phase electrolysis The equipment structure is more complex

Method used

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  • Method for producing lead by executing electrolysis and alkaline leaching on lead sulfate material
  • Method for producing lead by executing electrolysis and alkaline leaching on lead sulfate material
  • Method for producing lead by executing electrolysis and alkaline leaching on lead sulfate material

Examples

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Effect test

Embodiment 1

[0031] Using lead-tin sulfate mixed slag as raw material, the composition is (%) Pb 35; Sn 3.80; S 12; Fe 2; SiO 2 5.3; CaO4.

[0032] The electrolytic alkali immersion is carried out in an electrolytic alkali immersion tank with a volume of 20L. The structure of the electrolytic alkali immersion tank is as follows figure 2 shown. The middle of the electrolytic alkali immersion tank is an alkali-dissolving chamber 5, where the material is dissolved in alkali, and the electrolytic chambers 6 at both ends of the tank are used for electrolytic lead deposition and alkali regeneration, and the two chambers are separated by a diaphragm 2.

[0033] The material of the cathode is 304 stainless steel, the cathode is plate-shaped, and the anode is comb-shaped; the diaphragm of the electrolytic alkali immersion tank is acid-resistant fabric, such as polypropylene fiber, polyvinyl chloride fiber, polyester, etc., which can effectively prevent the slurry from penetrating without affecti...

Embodiment 2

[0037] Using plumberite as raw material, the composition is (%): Pb 38; S 9; BaO 5;

[0038] Au 0.0008; Ag 0.08.

[0039] The electrolytic alkali immersion was carried out in an electrolytic cell with a volume of 20 L, and 2 kilograms of material samples were processed each time. The electrolytic cell structure and control conditions were the same as in Example 1. The results of electrolytic alkali leaching are: the output sponge lead is melted and cast into metal lead containing 99.5% of Pb; the recovery rate of lead into metal is 93%, and the leaching slag composition: Pb 5%; Au0.0017%; Ag 0.17%; suitable for It is used as raw material for extracting precious metals gold and silver.

Embodiment 3

[0041] The lead-tin oxide slag produced by crude lead oxidation and tin removal is used as raw material, and the composition is (%):

[0042] Pb 42; Sn 35.

[0043] The electrolytic alkaline immersion is carried out in an electrolytic cell with a volume of 30L, and 3 kilograms of samples are processed each time. The structure of the electrolytic cell and the control conditions are the same as in Example 1. The result of electrolytic alkali leaching is: the output of flaky cathode lead Pb is 99.5%, and the recovery rate of lead metal is 98%. The composition of leaching slag is Sn 65%; Pb 10%; it should be used as raw material for tin smelting.

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Abstract

The invention relates to a method for producing lead by executing electrolysis and alkaline leaching on lead sulfate material, comprising the following steps: placing the pasted lead sulfate material to a blending infiltration chamber of an alkaline leaching electrolysis bath, introducing DC electricity to the electrolysis bath, dissolving lead in the lead sulfate by sodium hydroxide so as to enter the solution, passing through a partition film to enter an electrolysis chamber, enabling lead ions in electrolyte to discharge and separate out on a cathode, obtaining metallic sponge lead or leadparticles, regenerating partial sodium hydroxide in the solution, leading the electrolyte of the electrolysis outside, returning the electrolyte to the blending infiltration chamber to recycle after causticization treatment. The main alkaline leaching conditions are as follows: the cathode current density is 200-1000A / m2; the electrolyte temperature is 20-90 DEG C; the groove voltage is 1-5V; theelectrode homopolar distance is 50-120mm; and the liquid and solid ratio of the slurry is 5-12: 1. The lead sulfate alkaline leaching and the lead electrolysis are carried out simultaneously in a same device, thereby regenerating solvent sodium hydroxide, simplifying the working procedures, reinforcing the dissolving process of the lead-bearing material, and widening the application range of the method on the lead-bearing material.

Description

technical field [0001] The invention is a hydrometallurgical method for treating lead sulfate and lead oxide materials, including minerals, and can be used to extract metallic lead from these materials. Background technique [0002] At present, there are many hydrometallurgical methods for producing metallic lead from lead sulfate materials at home and abroad, mainly including carbonate conversion-fluorosilicate leaching-electrowinning and solid-phase electrolysis. The defects of these methods are mainly limited to the use of Process lead sulfate materials with relatively pure composition and high lead content, such as lead-acid battery paste, etc., but it is difficult to process materials with complex components and mixed metals; at the same time, the former method has a lengthy process, while the latter method uses solid-phase electrolysis The equipment structure is more complicated. Contents of the invention [0003] The purpose of the present invention is to solve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/18C22B3/12C22B13/02
CPCY02P10/20
Inventor 王树楷
Owner GREENNOVO ENVIRONMENTAL TECH CO LTD
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