A method for electrodepositing flake zinc in alkaline medium

An alkaline medium, electrodeposition technology, applied in electroforming, electrolysis process, etc., can solve the problems of large diameter-to-thickness ratio, difficult to clean zinc powder, inconvenient for further use, etc., to achieve the effect of improving the quality of precipitation and increasing hardness

Active Publication Date: 2020-06-16
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, under alkaline conditions, flaky zinc powder can be deposited, with high activity and large diameter-thickness ratio, but the flaky zinc powder is still in the form of powder
Zinc metal itself needs anti-oxidation surface treatment, and the anti-oxidation treatment of zinc powder is more complicated
Zinc powder is difficult to clean and is not convenient for further industrial use

Method used

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  • A method for electrodepositing flake zinc in alkaline medium
  • A method for electrodepositing flake zinc in alkaline medium
  • A method for electrodepositing flake zinc in alkaline medium

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Embodiment 1

[0027] The current density is 300A / ㎡, the electrolyte temperature is 30°C, the same pole is 10mm, the electrolysis cycle is 2h, the electrolyte contains 25g / LZnO, NaOH 6mol / L, stainless steel is used as anode, titanium sheet is used as cathode, and the stirring speed during electrolysis is 50r / min . Add 0.3g / L gelatin, 0.4g / L ethylenediaminetetraacetic acid disodium salt (EDTA) 0.4g / L, 0.2g / L lead oxide, 0.7g / L dipentaerythritol (DPE) to the solution to obtain flake Metal zinc with a current efficiency of 99.5%. The resulting scanning electron microscope image is figure 1 , which appear as small cubes.

Embodiment 2

[0031] The current density is 550A / ㎡, the electrolyte temperature is 35°C, the same pole is 10mm, the electrolysis cycle is 2h, the electrolyte contains 30g / L ZnO, NaOH6mol / L, stainless steel is used as anode, titanium sheet is used as cathode, and the stirring speed during electrolysis is 60r / min . Add 0.2g / L of gelatin, 0.5g / L of disodium ethylenediaminetetraacetic acid (EDTA), 0.1g / L of lead carbonate, and 0.4g / L of dipentaerythritol (DPE) into the solution to obtain flake Metal zinc with a current efficiency of 99.2%. The resulting scanning electron microscope image is image 3 , in small lumps.

Embodiment 3

[0035] The current density is 300A / ㎡, the electrolyte temperature is 40°C, the same pole is 10mm, the electrolysis cycle is 2h, the electrolyte contains 20g / L ZnO, NaOH6mol / L, stainless steel is used as anode, titanium sheet is used as cathode, and the stirring speed during electrolysis is 70r / min . Add 0.3g / L gelatin, 0.6g / L ethylenediaminetetraacetic acid disodium salt (EDTA), 0.3g / L lead sulfate, and 0.5g / L dipentaerythritol (DPE) to the solution to obtain flake Metal zinc with a current efficiency of 99.6%. The obtained product picture is as follows Figure 5 , the resulting product is smooth and flat, in the form of flakes.

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Abstract

The invention discloses a method for obtaining flaky zinc through electro-deposition in an alkaline medium. By the adoption of the method for obtaining flaky zinc through electro-deposition in the alkaline medium, the flaky zinc is obtained under the alkaline medium condition in an electro-deposition manner through the synergistic effect of compound additive and stirred-liquid-flow mass transferring. The compound additive is composed of 0.1-10 g / L of gelatin, 0.1-10 g / L of EDTA, 0.1-10 g / L of DPE and 0.1-10 g / L of additive A. The additive A is any one or more of lead oxide, lead sulfate and lead carbonate. In the electro-deposition process, mechanical stirring at the speed of 50-150 r / min is adopted to form liquid flow, and the flaky metal zinc can be obtained. The formed flaky zinc is easy to flush and convenient to transport, and the formed flaky zinc can be more easily molten to form ingots.

Description

technical field [0001] The invention belongs to the technical field of electrodepositing flaky zinc, and in particular relates to a method for electrodepositing flaky zinc in an alkaline medium. Background technique [0002] In recent years, my country's zinc metallurgy has developed rapidly and has become the world's largest producer and consumer of zinc. Although my country's zinc resources rank among the top in the world, there are many disadvantages, such as difficulty in mining, many low-grade minerals, few high-grade minerals, and mostly small and medium-sized minerals. Recycling secondary zinc resources is an essential part. [0003] The traditional way to recover zinc is to use fire method, but fire method has high energy consumption, low product purity, and serious environmental pollution. The wet process can recover a variety of metals in complex materials, and has the advantages of high recovery rate and environmental friendliness. The traditional acid zinc sme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04C25D1/20C25D3/22
CPCC25D1/04C25D1/20C25D3/22
Inventor 张承龙徐添妍王瑞雪马恩白建峰王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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