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Method for preparing silver powder with environment-friendly metal silver salt

A metal silver and environment-friendly technology, which is applied in the field of preparation of silver powder from environment-friendly metal silver salts, can solve the problems of waste, environmental pollution of precious metals, large silver content, etc., and achieve the effects of low pollution, low cost and simple production process

Inactive Publication Date: 2018-12-18
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing silver powder with an environment-friendly metal silver salt, so as to solve the problem that the waste liquid in the prior art contains a large amount of silver, and contains a large amount of ammonia nitrogen and organic matter, pollutes the environment and causes waste of precious metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Step 1, the preparation of silver citrate:

[0036] A, at room temperature, sodium citrate is dissolved in deionized water to obtain sodium citrate solution;

[0037] B, silver nitrate is dissolved in deionized water to obtain silver nitrate solution;

[0038] C, the sodium citrate solution is slowly added dropwise to the silver nitrate solution, after the dropwise addition, carry out strong stirring;

[0039] D, after standing for 2-4h, pour off the supernatant, wash the precipitate with deionized water and absolute ethanol, wash and dry to obtain silver citrate solid;

[0040] Step 2, thermal decomposition method prepares silver powder:

[0041] A. Dissolving the dispersant and the reducing agent in the solvent to obtain the bottom liquid A;

[0042] B. Add the silver citrate obtained in step 1 into the bottom solution A and stir until dissolved to obtain system B;

[0043] C. Place system B in a constant temperature system at 180-220°C and let it stand for heatin...

Embodiment 1

[0054] a, the preparation of silver citrate

[0055](1) At room temperature, dissolve 578g of sodium citrate in 2.7L of deionized water to obtain a sodium citrate solution; (2) Weigh 1000g of silver nitrate and dissolve it in 2.5L of deionized water to obtain a silver nitrate solution; (3) Dissolve The sodium citrate solution was slowly added dropwise to the silver nitrate solution, and the dropping time was 30 minutes. After the dropping was completed, the stirring speed of 390 rpm was strongly stirred for 60 minutes; The obtained precipitate was washed three times with deionized water and once with absolute ethanol, and dried at 60° C. to obtain a white silver citrate solid.

[0056] b, thermal decomposition method to prepare silver powder

[0057] (1) Dissolve 8.5g of polyvinylpyrrolidone and 102g of ascorbic acid in 1.2L of deionized water to obtain bottom solution A; (2) weigh 85g of dried silver citrate and add it to bottom solution A and stir until dissolved. Obtain s...

Embodiment 2

[0059] a, the preparation of silver citrate

[0060] (1) At room temperature, dissolve 578g of sodium citrate in 3.4L of deionized water to obtain a sodium citrate solution; (2) Weigh 1000g of silver nitrate and dissolve it in 2.5L of deionized water to obtain a silver nitrate solution; (3) Dissolve The sodium citrate solution was slowly added dropwise to the silver nitrate solution for 30 minutes. After the dropwise addition, the stirring speed was 390rpm and stirred for 60 minutes; The obtained precipitate was washed three times with deionized water and once with absolute ethanol, and dried at 60° C. to obtain a white silver citrate solid.

[0061] b, thermal decomposition method to prepare silver powder

[0062] (1) Dissolve 20g of polyvinylpyrrolidone and 160g of ascorbic acid in 1.5L of deionized water and add 0.5L of glycerin to obtain bottom solution A; (2) Weigh 100g of dried silver citrate and add it to bottom solution A Stir until dissolved to obtain system B; (3) ...

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Abstract

The invention discloses a method for preparing silver powder with environment-friendly metal silver salt, and belongs to the technical field of conductive metal powder preparation. The method comprises the following steps of preparing silver citrates and preparing the silver powder by a thermal decomposition method. The silver nitrates are used as raw materials to prepare the environment-friendlymetal silver salt, and the superfine silver powder with 9-12 microns is prepared through thermal decomposition. No wastewater containing ammonia nitrogen is produced in the preparation process of thesilver powder, the production process is simple, environment-friendly and low in cost, and industrial production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of conductive metal powder preparation, in particular to a method for preparing silver powder with an environment-friendly metal silver salt. Background technique [0002] With the continuous progress and development of social industry, at the same time, due to insufficient anticipation of the negative impact of highly developed industries and poor prevention, three global crises have resulted: resource shortage, environmental pollution, and ecological destruction. Among them, environmental pollution will cause direct damage and impact on the ecological system, such as desertification and forest destruction, and will also cause indirect harm to human society. Sometimes the harm caused by this indirect environmental benefit is greater than the direct harm caused at that time. Also harder to remove. [0003] With the globalization of economy and trade, industrial pollution has become the most important factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30
CPCB22F9/30
Inventor 曹笃盟杨荣春齐勇马骞范秀娟王维斌张亚红任哲峥包飞燕王媛媛孟涛何艳吴芳
Owner JINCHUAN GROUP LIMITED
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