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Preparation method of flaky zinc powder

A scaly zinc powder, metal zinc technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of difficult control of the size and shape of the zinc powder, the need to improve the current utilization rate, and the difficulty in controlling the thickness of the film layer, so as to achieve the quality of the prepared products Good, improve energy utilization and equipment utilization efficiency, improve the effect of energy utilization efficiency

Active Publication Date: 2015-04-29
YANGZHOU SHUANGSHENG ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are: (1) the deposition process of the zinc film needs to be carried out in high vacuum and low pressure inert gas; (2) the purity of the evaporated zinc needs to be above 99%, and the purity of the inert gas also needs to be above 99%, The temperature of the evaporation source needs to reach 800°C~1000°C during evaporation; (3) The thickness of the film layer is not easy to control, and the gas flow rate and pressure, heating temperature, heating time and the type of inert gas all affect the thickness of the film layer
The preparation method of electrolytic flaky zinc powder has short production cycle, low cost, no pollution, and high product purity, but the size and shape of zinc powder prepared by electrolytic method are not easy to control, and the current utilization rate needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of scaly zinc powder of the present invention, comprises the following steps successively:

[0032] (1) Machining and forming: metal zinc is machined into a plate shape and used as a soluble anode;

[0033] (2) Anode dissolution: In the anode chamber of the electrochemical reactor, the soluble anode prepared in the previous step is used as the anode of the electrochemical reactor, and zinc sulfate and sulfuric acid aqueous solution are used as the electrolyte, on the interface between the soluble anode and the electrolyte Oxidation reaction of zinc occurs, so that the soluble anode is oxidized into zinc ions and enters the anolyte. The electrochemical reactor is a kettle-type container, and it is a double-chamber electrolytic cell; the concentration of zinc ions in the electrolyte is 0.1g / L, and the concentration of sulfuric acid is 5.0 g / L, the anode current density is 100A / m2;

[0034] (3) Solid-liquid separation: the anolyte obtained in the pr...

Embodiment 2

[0043] The preparation method of scaly zinc powder of the present invention, comprises the following steps successively:

[0044] (1) Machining and forming: metal zinc is machined into a plate shape and used as a soluble anode;

[0045] (2) Anode dissolution: In the anode chamber of the electrochemical reactor, the soluble anode prepared in the previous step is used as the anode of the electrochemical reactor, and zinc sulfate and sulfuric acid aqueous solution are used as the electrolyte, on the interface between the soluble anode and the electrolyte Oxidation reaction of zinc occurs, so that the soluble anode is oxidized into zinc ions and enters the anolyte. The electrochemical reactor is a tank container and a double-chamber electrolytic cell; the concentration of zinc ions in the electrolyte is 2.0g / L, and the concentration of sulfuric acid is 50.0g / L, the anode current density is 500A / m2;

[0046] (3) Solid-liquid separation: the anolyte obtained in the previous step i...

Embodiment 3

[0055] The preparation method of scaly zinc powder of the present invention, comprises the following steps successively:

[0056] (1) Machining and forming: metal zinc is machined into a plate shape and used as a soluble anode;

[0057] (2) Anode dissolution: In the anode chamber of the electrochemical reactor, the soluble anode prepared in the previous step is used as the anode of the electrochemical reactor, and zinc sulfate and sulfuric acid aqueous solution are used as the electrolyte, on the interface between the soluble anode and the electrolyte Oxidation reaction of zinc occurs, so that the soluble anode is oxidized into zinc ions and enters the anolyte. The electrochemical reactor is a tubular container and a double-chamber electrolytic cell; the concentration of zinc ions in the electrolyte is 5.0g / L, and the concentration of sulfuric acid is 150.0g / L, the anode current density is 1500A / m2;

[0058] (3) Solid-liquid separation: the anolyte obtained in the previous s...

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Abstract

The invention relates to a preparation method of flaky zinc powder. The preparation method comprises the following steps in sequence: machining metallic zinc into a flake and using the flake as a soluble anode; in an anode chamber of an electrochemical reactor, taking zinc sulfate and sulfuric acid water solution as an electrolyte, oxidizing the soluble anode into zinc ions and enabling the zinc ions to enter anolyte; and after solid-liquid separation and anolyte impurity removal, adding an alkyl glycoside surfactant to the anolyte and adjusting the pH value to 5.0-6.5, then injecting the electrolyte into a cathode chamber of the electrochemical reactor, carrying out electrochemical reduction reaction on the cathode and separating out metallic zinc through deposition, simultaneously starting an ultrasonic generating device to strip metallic zinc on the cathode and deposit metallic zinc in the electrolyte below the cathode and then obtaining the qualified flaky zinc powder through solid-liquid separation, washing, vacuum drying, screening and packaging. The preparation method has the advantages of reasonable and convenient process, safe and reliable preparation course and good prepared product quality.

Description

technical field [0001] The invention relates to a preparation method of zinc powder, in particular to a preparation method of scaly zinc powder. Background technique [0002] At present, the preparation methods of flaky zinc powder at home and abroad mainly include evaporation-condensation method, explosion method, ball milling method and electrolysis method. [0003] Evaporation-condensation method utilizes mature thin film preparation technology. First, zinc is deposited on the substrate to form a zinc film by evaporation method, then the zinc film is eluted and separated, and then crushed by ultrasonic technology to prepare scaly zinc powder. Zinc powder prepared by evaporation-condensation method has uniform particle size and good crystallization. The main disadvantages of this process are: (1) the deposition process of the zinc film needs to be carried out in high vacuum and low pressure inert gas; (2) the purity of the evaporated zinc needs to be above 99%, and the pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/08C25C5/02
Inventor 徐桂森许文林陈新雨
Owner YANGZHOU SHUANGSHENG ZINC IND
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