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Preparation method of high-purity active zinc powder

An active zinc, high-purity technology, applied in the field of preparation of high-purity active zinc powder, to achieve the effects of easy maintenance, narrow grain size distribution, and increased current utilization

Inactive Publication Date: 2012-02-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method of high-purity active zinc powder

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Embodiment 1

[0038] A preparation method of high-purity active zinc powder mainly consists of the following steps:

[0039] (a) Preparation of electrolyte: take 40g L of zinc sulfate -1 , ammonium chloride 100g·L -1 , mix with water, adjust the pH value of the mixed solution to 7.5;

[0040] (b) Add 0.2g L of sodium citrate to the electrolyte -1 ;

[0041] (c) Determine the electrolysis process conditions as: temperature 30°C, current density 20A dm -2 , the duty cycle is 0.8, the frequency is 1000Hz, the pole spacing is 5cm, the powder scraping cycle is 300s, and the electrolysis is carried out under these conditions;

[0042] (d) Using a corrosion inhibitor (NH with a pH value of 8.5 3 -NH 4 The mixture of Cl buffer solution and polyvinylpyrrolidone, the volume ratio of buffer solution and polyvinylpyrrolidone is 5: 1) the zinc powder obtained after step (c) is cleaned; the amount of corrosion inhibitor is advisable to submerge the zinc powder, fully stirred Mix and wash twice;

[...

Embodiment 2

[0047] A preparation method of high-purity active zinc powder mainly consists of the following steps:

[0048] (a) Preparation of electrolyte: take 40g L of zinc sulfate -1 , ammonium chloride 100g·L -1 , mix with water, adjust the pH value of the mixed solution to 7.5;

[0049] (b) Add sodium tripolyphosphate 0.2g L to the electrolyte -1 ;

[0050] (c) Determine the electrolysis process conditions: temperature 30°C, current density 15A dm -2 , the duty cycle is 0.8, the frequency is 500Hz, the pole spacing is 6cm, the powder scraping cycle is 500s, and the electrolysis is carried out under these conditions;

[0051] (d) Using a corrosion inhibitor (NH with a pH value of 8.5 3 -NH 4 The mixture of Cl buffer solution and polyvinylpyrrolidone, the volume ratio of buffer solution and polyvinylpyrrolidone is 5: 1) the zinc powder obtained after step (c) is cleaned; the amount of corrosion inhibitor is advisable to submerge the zinc powder, fully stirred , wash 3 times;

[...

Embodiment 3

[0056] A preparation method of high-purity active zinc powder mainly consists of the following steps:

[0057] (a) Preparation of electrolyte: take 50g L of zinc sulfate -1 , ammonium chloride 80g·L -1 , mixed with water to adjust the pH value of the mixed solution to 8;

[0058] (b) Add gelatin 0.3g·L to the electrolyte solution -1 ;

[0059] (c) Determine the electrolysis process conditions as: temperature 30°C, current density 15A dm -2 , the duty cycle is 0.5, the frequency is 1000Hz, the pole spacing is 6cm, and the powder scraping cycle is 700s. Electrolysis is carried out under these conditions;

[0060] (d) Using a corrosion inhibitor (NH with a pH value of 8.5 3 -NH 4 The mixture of Cl buffer solution and polyvinylpyrrolidone, the volume ratio of buffer solution and polyvinylpyrrolidone is 5: 1) the zinc powder obtained after step (c) is cleaned; the amount of corrosion inhibitor is advisable to submerge the zinc powder, fully stirred , wash 3 times;

[0061] ...

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Abstract

The invention provides a preparation method of high-purity active zinc powder, which is characterized by comprising the following steps: taking the following components based on mass content: 30-100g.L-1 of zinc sulfate, 80-120g.L-1 of ammonium chloride and 0.1-0.5g.L-1 of an additive, mixing the components with water, and adjusting a pH value to be 7-8.5; taking a stainless steel plate as a cathode and a coarse zinc plate as an anode, and electrolyzing under conditions of temperature of 15-40 DEG C, current density of 10-25A.dm-2, duty cycle of 0.7-0.9, frequency of 200-2000Hz and powder scraping cycle of 300-1000 seconds; cleaning the zinc powder with a corrosion inhibitor; and after-treating, filtering and drying the zinc powder to obtain the high-purity active zinc powder mass percentage content of which is not less than 99%. The obtained high-purity active zinc powder with controllable shape and appearance and high specific surface area up to 0.15-0.24m2.g-1 can be used in chemical industry, zinc anticorrosive paint industry, metallurgy and other industries.

Description

technical field [0001] The invention belongs to a method for preparing metal zinc powder, and relates to a method for preparing high-purity active zinc powder. The zinc powder prepared by the invention can be used in chemical industry, zinc anticorrosion coating industry, metallurgy and other industries, especially in battery industry, which has strong industrialization prospect. Background technique [0002] In recent years, the development and research of new materials have been actively carried out all over the world, and the research of materials is developing towards various limit states. The preparation and application research of active metal powder materials have become one of the most concerned new materials. Among them, active zinc powder has been widely used in chemical production, zinc anti-corrosion coating production, hydrometallurgy, medicine and pesticide, battery industry, etc. At present, the market demand for active zinc powder at home and abroad is relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02
Inventor 戴亚堂张欢魏自创刘芳芳张红强张杰
Owner SOUTHWEAT UNIV OF SCI & TECH
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