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Method for preparing high-purity superfine silver powder

An ultra-fine silver and high-purity technology, which is applied in the field of preparation of high-purity ultra-fine silver powder, can solve problems such as low purity, uneven product particle size, and difficult control conditions, and achieve high purity, low cost, and fast response.

Active Publication Date: 2016-06-15
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method for preparing ultra-fine silver powder has the disadvantages that the conditions are not easy to control, the particle size of the product is not uniform, and the purity is not high.

Method used

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  • Method for preparing high-purity superfine silver powder
  • Method for preparing high-purity superfine silver powder
  • Method for preparing high-purity superfine silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. Put 100g of silver nitrate in the first container, add 55ml of deionized water, stir continuously until the silver nitrate is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 14 hours, and filter, Wash and filter the obtained crystals with absolute ethanol to obtain purified silver nitrate crystals;

[0024] b. Put 38g of sodium chloride in the second container, add 105ml of deionized water, stir continuously until the sodium chloride is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 14 hours, and filter , washing and filtering the gained crystals with absolute ethanol to obtain purified sodium chloride crystals;

[0025] c. 85g of silver nitrate crystals purified in step a are placed in the third container, then 105ml of deionized water is added to configure silver nitrate solution, and 30.5g of purified sodium chloride crystals in step b are added to 105ml to remove Ionized wat...

Embodiment 2

[0031] a. Put 100g of silver nitrate in the first container, add 50ml of deionized water, stir continuously until the silver nitrate is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 16 hours, and filter, Wash and filter the obtained crystals with absolute ethanol to obtain purified silver nitrate crystals;

[0032] b. Put 38g of sodium chloride in the second container, add 110ml of deionized water, stir continuously until the sodium chloride is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 16 hours, and filter , washing and filtering the gained crystals with absolute ethanol to obtain purified sodium chloride crystals;

[0033] c, 85g of silver nitrate crystals purified in step a are placed in a third container, then 110ml of deionized water is added to configure silver nitrate solution, and 29.25g of sodium chloride crystals purified in step b are added to 100ml to remove Ionized wate...

Embodiment 3

[0039] a. Put 100g of silver nitrate in the first container, add 60ml of deionized water, stir continuously until the silver nitrate is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 12 hours, and filter, Wash and filter the obtained crystals with absolute ethanol to obtain purified silver nitrate crystals;

[0040] b. Put 38g of sodium chloride in the second container, add 100ml of deionized water, stir continuously until the sodium chloride is completely dissolved, then add absolute ethanol until no crystals are precipitated, age for 12 hours, and filter , washing and filtering the gained crystals with absolute ethanol to obtain purified sodium chloride crystals;

[0041] c. Put 85g of silver nitrate crystals purified in step a in the third container, then add 100ml of deionized water to configure silver nitrate solution, then add 32g of purified sodium chloride crystals in step b to 110ml of deionized Water is configured into so...

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Abstract

The invention discloses a method for preparing high-purity superfine silver powder. The method comprises the following steps: a, purifying silver nitrate crystals; b, purifying sodium chloride crystals; c, preparing a silver chloride precipitate; d, putting the silver chloride precipitate obtained in the step c into a fourth container, further adding a water-ethanol solution of NH2OH*HCl into the fourth container, continuously stirring till the silver chloride precipitate is completely dissolved, wherein the reaction temperature is 20-25 DEG C, the stirring speed is 350-450r / minute, and suspended black solids are generated on the liquid surface; e, performing filtration and drying under a vacuum condition, and obtaining the high-purity superfine silver powder. The method has the beneficial effects that the silver powder can be prepared from reaction under a homogeneous condition, is small in granularity and uniform in granule, needs no addition of a dispersing agent, is easy to wash and high in silver powder purity; during the ionic reaction in the solution, the contact area is large and the reaction speed is high; the reaction is under normal pressure, the production process is simple and the cost is low; no pollutant is discharged.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a preparation method of high-purity ultrafine silver powder. Background technique [0002] Ultrafine silver powder can produce small size volume effect and surface effect. It has physical and chemical properties that traditional powder materials do not have. The preparation methods of ultra-fine silver powder are divided into two categories: physical method and chemical method. Physical methods include spray thermal decomposition method, mechanical ball milling method, evaporation condensation method, etc.; chemical methods mainly include chemical reduction method, electrochemical deposition method, microemulsion method, etc. At present, the preparation of ultrafine silver powder at home and abroad mostly adopts the chemical reduction method. some with Ag 2 CO 3 As a raw material, it is prepared with a polymer reducing agent such as polyethylene glycol under high temp...

Claims

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 邸万山孙树桐
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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