Zinc electrolysis anode plate and preparing method thereof

A technology of anode plate and electrolytic zinc, which is applied in the direction of electrodes, anodic oxidation, and electrolytic process, can solve the problems of lower production efficiency, the Pb content of cathode zinc products cannot meet the required standards, and improve the cutting strength, etc. Production efficiency, long cutting interval, and the effect of reducing production intensity

Active Publication Date: 2019-04-26
湘西土家族苗族自治州质量检验及计量检定中心
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Problems solved by technology

[0004] Since the new lead-based anode is directly electrolyzed in the zinc electrowinning solution according to the electrowinning process, under this electrolytic condition, those loosely bound MnO 2 Gradually fall off, leaving the tightly combined part to accumulate and thicken continuously. It takes a long time to form a relatively dense, stable, and well-bonded protective layer on the surface. Therefore, in the initial long period of time, not only the cathode zinc product Pb The content does not meet the required standard, and it will significantly reduce production efficiency and increase the strength of cutting

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  • Zinc electrolysis anode plate and preparing method thereof
  • Zinc electrolysis anode plate and preparing method thereof
  • Zinc electrolysis anode plate and preparing method thereof

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preparation example Construction

[0021] The invention provides a method for preparing an anode plate for electrolytic zinc, comprising the following steps:

[0022] Step 1. After the lead substrate is polished and brightened, place it in the sulfuric acid solution of the electrolytic cell and use it as the anode, and another lead alloy plate as the cathode. Under low current density, anodize to obtain dense PbO 2 Anode plate for protective layer;

[0023] Specifically, the lead substrate is made of lead or lead alloy, the sulfuric acid concentration in the sulfuric acid solution is 100-150g / L, and the current density is 20-40A / m 2 , the temperature of the sulfuric acid solution is 20-40°C, the distance between the anode and the cathode is 6-10cm, and the electrolysis time is 4-24 hours.

[0024] Step 2, taking out the anode plate, placing it in the sulfuric acid solution of another electrolytic cell and using it as the anode, another lead alloy plate as the cathode, and electroplating MnO on the anode plate ...

Embodiment 1

[0040] Step 1. After polishing the surface of the new lead substrate obtained by rolling or casting, place it in sulfuric acid solution, use it as the anode in the electrolytic cell, and another lead alloy plate as the cathode. Anodic oxidation to obtain dense PbO 2 The protective layer. The specific method is that the concentration of sulfuric acid used is 150g / L, and the current density is 25A / m 2 , the temperature of the sulfuric acid solution was 30°C, the distance between the anode and the cathode was 8cm, and the electrolysis was performed for 12 hours.

[0041] Step 2, the above-mentioned formed PbO 2 The anode plate of the protective layer is taken out, placed in another electrolytic cell, with it as the anode, and another lead alloy plate is the cathode, and the tank solution is composed of a sulfuric acid concentration of 150g / L, Mn in the sulfuric acid solution 2+ The content is 60g / L, the temperature of the sulfuric acid solution is 90°C, the distance between th...

Embodiment 2

[0054] Step 1. After polishing the surface of the new lead substrate obtained by rolling or casting, place it in sulfuric acid solution, use it as the anode in the electrolytic cell, and another lead alloy plate as the cathode. Anodic oxidation to obtain dense PbO 2 The protective layer. The specific method is that the concentration of sulfuric acid used is 150g / L, and the current density is 40A / m 2 , the temperature of the sulfuric acid solution was 33°C, the distance between the anode and the cathode was 8cm, and the electrolysis was performed for 12 hours.

[0055] Step 2, the above-mentioned formed PbO 2 The anode plate of the protective layer is taken out, placed in another electrolytic cell, with it as the anode, and another lead alloy plate is the cathode, and the tank solution is composed of a sulfuric acid concentration of 150g / L, Mn in the sulfuric acid solution 2+ The content is 70g / L, the temperature of the sulfuric acid solution is 90°C, the distance between th...

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Abstract

The invention discloses a preparing method of a zinc electrolysis anode plate. The preparing method comprises the following steps that firstly, under low current density, anode oxidization is conducted, and a dense PbO2 protection layer anode plate is obtained; secondly, electroplating of an MnO2 protection layer is conducted on the anode plate; thirdly, by mass percent, 20-30% of an Mn(NO3)2 solution is prepared; and fourthly, a chemical MnO2 deposition layer is generated on the anode plate, the fourth step is repeatedly conducted 2-5 times, and the zinc electrolysis anode plate is obtained.The invention further provides the zinc electrolysis anode plate. The preparing method of the zinc electrolysis anode plate and the zinc electrolysis anode plate have the following beneficial effectsthat an electrolytic zinc product with the extremely low Pb content can be obtained at the beginning of production; the current efficiency is improved, the production intensity is lowered, and the production efficiency is improved; and dissolving of Pb alloy materials is effectively prevented, the service life is longer, and the lead content in product zinc is lower.

Description

【Technical field】 [0001] The invention relates to the technical field of electrolytic zinc production, in particular to an anode plate for electrolytic zinc and a preparation method thereof. 【Background technique】 [0002] In related technologies, due to the characteristics of low cost and easy processing of lead or lead alloy anodes, pure lead or lead alloys containing 0.5 to 1.0 wt% silver, and lead-silver-calcium anodes are often used in the electrolytic zinc process. , Lead-silver-calcium-strontium and other multi-element alloys are used as anodes. When the lead or lead alloy anode directly contacts the electrolyte at a relatively high positive potential, the oxidative dissolution of the alloy components will occur, and the dissolved alloy components, mainly lead, will be deposited on the cathode, resulting in high lead content in the cathode zinc product. Therefore, usually the newly prepared alloy anode plate needs to be oxidized and passivated first to form PbO on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C25C7/02C25D11/34C25D9/06C23C18/12C23C28/04
CPCC23C18/1216C23C28/04C25C1/16C25C7/02C25D9/06C25D11/34
Inventor 陈益超谭永生向宇陈上刘锋
Owner 湘西土家族苗族自治州质量检验及计量检定中心
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