Low bath voltage zinc electrolysis method

A technology of electrolytic zinc and low tank, applied in the field of zinc hydrometallurgy, can solve the problems of high tank pressure, high energy consumption, high energy consumption of electrolytic zinc, etc. Effect

Inactive Publication Date: 2015-09-16
BEIJING UNIV OF TECH +1
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Problems solved by technology

[0009] Aiming at the problems of high tank pressure and high energy consumption in the current electrolytic zinc industry, the present invention proposes a new electrolytic zinc method with low tank pressure
The invention can solve the problem of high energy consumption of electrolytic zinc in the field of hydrometallurgy, so as to meet the production and development needs of industrialized low-energy emission reduction

Method used

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Embodiment

[0032] The new low tank voltage electrolytic zinc method includes the steps of zinc immersion, liquid mixing, electrolysis, and waste liquid control. The specific process is as attached figure 1 The flowchart shown.

[0033] The zinc leaching step is to use dilute sulfuric acid to leach the raw zinc oxide ore, the leached new solution has a zinc content of 70-80 g / L, and the electrolyte solution contains a sulfuric acid content of 150-160 g / L. Purified new solution is required to meet: Cd<0.5mg / L, Cu<0.1mg / L, Co<0.2mg / L, Fe<15mg / L, As<0.01mg / L.

[0034] The mixing step is to mechanically mix the new solution, sulfuric acid and the electrolytic waste solution recycled through the diversion tank in the mixing tank, and add methanol so that the methanol content is 80-100g / L. After physical and mechanical mixing, the final product is obtained. The electrolyte enters the electrolytic cell for electrolytic zinc process.

[0035] The electrolysis step comprises the steps of adoptin...

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Abstract

A low bath voltage zinc electrolysis method relates to the field of zinc hydrometallurgy and solves the problem of large energy consumption of zinc electrolysis to adapt to industrial low energy and emission reduction production development demands. A certain concentration of C1-C4 organic linear acid or organic liner alcohol is added to an electrolyte, and the oxidation reaction potential of the C1-C4 organic linear acid or organic liner alcohol is lower than an anodic oxygen evolution potential, so the anodic reaction is characterized in that an organic matter oxidation reaction is preferentially carried out, and the electrode reaction process is fundamentally changed, thereby the bath voltage of a reaction system is reduced, and the problem of large energy consumption in the electrolysis process is effectively alleviated.

Description

technical field [0001] The invention relates to the field of zinc hydrometallurgy, in particular to a low tank pressure electrolytic zinc method. Background technique [0002] With the rapid development of the galvanizing industry, zinc alloy industry, and battery industry, the demand for zinc in countries around the world is increasing. As a major zinc-producing country, China's hydrometallurgical zinc production accounts for more than 80% of zinc production. However, the ineffective power consumption of hydrometallurgy amounts to 4.5 billion kilowatt-hours per year, accounting for 1 / 3 of Gezhouba's annual power generation. How to reduce energy consumption has become a major technical problem for the industry. [0003] Taking electrolytic zinc sulfate as an example, the cathode reaction is: [0004] [0005] The anode reaction is: [0006] [0007] The standard reaction potential of the anode oxygen evolution reaction is as high as 1.23V, and the precipitation of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16
CPCC25C1/16
Inventor 王义智黄一兵李钒
Owner BEIJING UNIV OF TECH
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