Silver nitrate purifying method

A purification method, silver nitrate technology, applied in chemical instruments and methods, silver compounds, silver compounds and other directions, can solve the problems of difficult to control the content of heavy metal and precious metal impurity ions, affecting product quality, complicated operation, etc., to achieve stable product quality, Simple operation and high-purity effect

Inactive Publication Date: 2013-09-04
TAICANG HUSHI REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a method for purifying silver nitrate to overcome the complex operation of preparing high-purity silver nitrate in the prior art, high energy consumption, high cost, difficulty in controlling the content of heavy metal and precious metal impurity ions, and affecting product quality. lack of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1000g of industrial grade silver nitrate to 1000ml of deionized water and stir to dissolve, then add 150g of complexing agent (A) and stir at 50°C for 3h, let stand for 0.5h, wait for impurities to hydrolyze and precipitate, add 50g of activated carbon to the solution after filtration and stir for 1h, Then the activated carbon was removed by filtration, and the filtrate was concentrated under reduced pressure at 65°C to obtain 977g of purified silver nitrate with a yield of 97.7% and a purity of 99.99% (ICP-MS analysis).

[0020] In the present embodiment, described complexing agent (A) is EDTA, NTA, NH 3 , a mixture of DTPA, EGTA and DEG, the molar ratio of which is 1:1:0.2:0.4:0.5:0.3.

Embodiment 2

[0022] Add 1000g of industrial-grade silver nitrate to 1050ml of deionized water and stir to dissolve, then add 165g of complexing agent (A) and stir at 55°C for 3.5h, let stand for 0.75h, wait for impurities to hydrolyze and precipitate, add 75g of activated carbon to the solution after filtration and stir for 1.5 h, then filtered to remove activated carbon, and the filtrate was concentrated under reduced pressure at 63°C to obtain 969g of purified silver nitrate, with a yield of 96.9% and a purity of 99.992% (ICP-MS analysis);

[0023] In the present embodiment, described complexing agent (A) is EDTA, NTA, NH 3 , DTPA, EGTA and DEG mixture, its mixing molar ratio is 1:0.5:0.1:0.3:0.4:0.2.

Embodiment 3

[0025] Add 1000g of industrial-grade silver nitrate to 1100ml of deionized water and stir to dissolve, then add 180g of complexing agent (A) and stir at 60°C for 4h, let it stand for 1h, wait for impurities to hydrolyze and precipitate, add 100g of activated carbon to the solution after filtration and stir for 2h, then Activated carbon was removed by filtration, and the filtrate was concentrated under reduced pressure at 60°C to obtain 951 g of purified silver nitrate with a yield of 95.1% and a purity of 99.995% (ICP-MS analysis);

[0026] In the present embodiment, described complexing agent (A) is EDTA, NTA, NH 3 , The mixture of DTPA, EGTA and DEG has a molar ratio of 1:0.75:0.15:0.350.45:0.25.

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Abstract

The invention discloses a silver nitrate purifying method. Industrial-grade silver nitrate is taken as the raw material; the deionized water is added into the silver nitrate; stirring operation is conducted to dissolve the silver nitrate into the deionized water; then a complexing agent (A) independently researched and developed by the company is added to hydrolyze and precipitate various impurities; and the filtered solution is collected through the conventional method to obtain the purified silver nitrate. The purity of the silver nitrate obtained through the silver nitrate purifying method is up to more than 99.99%, the yield is 95-98%; the contents of foreign ions of both heavy metal and precious metal are lower than 1 ppm; compared with the prior art, through the adoption of the complexing agent (A) independently researched and developed by the company, the foreign ions of heavy metal and precious metal in the industrial-grade silver nitrate can be effectively removed; the product quality is stable; the operation is simple and convenient; the energy consumption is low; the purity is high, and therefore, the silver nitrate purifying method has the prospect of industrial production.

Description

technical field [0001] The invention relates to a method for purifying silver nitrate. Background technique [0002] Silver nitrate is an important chemical product. It is the basic raw material for the production of various photosensitive materials, silver catalysts, contact materials, antibacterial materials, silver oxide and ultra-fine silver powder and other silver fine chemical products. It has a wide range of applications in many fields. [0003] In the prior art, the conventional preparation method of silver nitrate is to use silver as a raw material, dissolve it with dilute nitric acid to obtain a silver nitrate solution, and obtain a silver nitrate product through evaporation, concentration, crystallization and other treatments. With the development of photosensitive material production technology, higher and higher requirements are put forward for the quality of silver nitrate and the content of impurity ions. Reagent grade silver nitrate (content is 99.5-99.8%) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G5/00
Inventor 王伟顾小焱吕明王永旗萧瑞雪
Owner TAICANG HUSHI REAGENT
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