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Method and device for zinc electrowinning from sulfate solutions

An electrolytic extraction and solution technology, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve problems such as productivity, power consumption, etc., and achieve the effect of increasing process efficiency and high productivity

Inactive Publication Date: 2014-03-26
KCM 2000 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Disadvantage of all known processes and devices, irrespective of the relative increase in productivity, is the main factor in the effectiveness of electrolytic extraction of metals, i.e. electricity consumption

Method used

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  • Method and device for zinc electrowinning from sulfate solutions
  • Method and device for zinc electrowinning from sulfate solutions
  • Method and device for zinc electrowinning from sulfate solutions

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In a volume equipped with 60 cathodes 3 is about 30m 3 , 3.5m high and 1.6m wide electrolytic cell to achieve electrolytic extraction, each cathode has about 6m 2 area. The density of the supply current is about 300A / m 2 . The electrolyte enters the bath-reactor 5 via two (diffusion) tubes 1 at a rate of about 500 to 700 l / min and leaves via the overflow 2 along its entire short side. The lead anode 4 is formed by two symmetrical parts, the surface of which is shaped as a stepped groove with a tapered lower part, at least 80% of the anode 4 is fixed by a plastic strip passing through a plastic gasket 10 in the middle and lower end of the anode 4 Make additions. The mixed electrolyte containing 70g / l zinc and 180g / l sulfuric acid and necessary additives enters the reactor at a temperature of about 30°C (about 37°C at the outlet); the yield is 90% and the energy consumption is about 2600Kwh / t zinc.

[0023] The duration of the cathodic cycle was about 72 h; the metal...

Embodiment 2

[0025] This process is carried out in a double electrolyzer formed by two baths with an intermediate wall and connected by a siphon along its entire width. The baths are each equipped with 62 cathodes, i.e. about 124 each with an area of ​​about 6 m 2 Circulation is achieved by overflowing between them at a rate of about 800 to 1200 l / min from top to bottom with 4 tube-diffusers (two at each inlet) above and in the middle. The anode configuration and fixing elements are the same as in Example 1. Using the same electrolyte, the current density is about 300А / m 2 , The zinc deposition period is 72h. Yield is about 90%, energy consumption is about 2700Kwh, zinc purity is about 99.995%. Effective sludge removal was accomplished in about 30 days.

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Abstract

The invention relates to a method and a device for electrowinning of zinc from sulfate solutions. The electrolyzer for zinc extraction according to the invention includes a bath-reactor (5) which is equipped with power supply buses (6), a pipeline of two pipes (1) for supplying the electrolyte, cathodes (3), anodes (4), plastic strips (8) along the height of the anodes (4), and an overflow (2) for electrolyte discharge by gravity. The cathodes (3) have an area of 3.5-10m<2>. The height of the electrolyzer is at least two times greater than its width, and the length of the electrolyzer depends on the number of the electrodes. The bottom of the electrolyzer is divided by a groove (11) along the length of the bath (5).

Description

technical field [0001] The present invention relates to a method and equipment for electrolytically extracting zinc from sulfate solution. Background technique [0002] Various methods and equipment are known for obtaining electrolytic zinc, 90% of which is produced by hydrometallurgy. In conventional electrolytic baths, pass about 400 to 600А / m 2 The current density, about 1.0 to 1.6m 2 The process was performed by manually stripping the zinc cathode from the cathode sheet within 24 hours of the cathode area. A new technology in this direction (the application of which started about 25 years ago) is the so-called Jumbo bath and the area is about 2.60 to 3.40m 2 electrodes, each bath contains about 80 to 120 cathodes. This technology is now used in modern electrolytic zinc plants, where zinc stripping is done mechanically by various equipment at an energy consumption of about 3100 to 3500 kWh / t per 48 hours. [0003] A disadvantage of all known processes and devices, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C25C7/00
CPCC25C7/00C25C7/02C25C1/16
Inventor I·恩切夫N·多布雷夫G·博兹希洛夫
Owner KCM 2000