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Method for synthesizing high-purity silver sulfate

A synthesis method and technology of silver sulfate, applied in the directions of silver compounds, silver compounds, chemical instruments and methods, etc.

Active Publication Date: 2013-12-04
TAICANG HUSHI REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by this invention is to provide a kind of synthetic method of silver sulfate, to overcome the complicated and complex operation of prior art when synthesizing silver sulfate, the deficiencies of complex process

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  • Method for synthesizing high-purity silver sulfate

Examples

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Comparison scheme
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Embodiment 1

[0020] Add 10kg of silver nitrate to 10L of deionized water, stir to dissolve, filter, then add 21L of sodium hydroxide solution with a mass fraction of 10% to form a silver oxide precipitate, and finally add 0.275kg of purifying agent composition and stir for 2 hours, filter out the silver oxide precipitate , washed the precipitate twice with deionized water, drained and centrifuged, and gradually added to 16kg of concentrated sulfuric acid with a mass fraction of 95-98% and a temperature of 80°C to dissolve it in batches under stirring, and continued heating to 135°C , continue to keep warm for 3 hours, after cooling, slowly pour the solution into 13MΩ.CM deionized water to precipitate silver sulfate, then filter out silver sulfate, wash twice with 0.5L ethanol with a mass fraction of 99.5%, and then dry it. 8.39kg of high-purity grade silver sulfate, the yield is 91.39%, and the purity is 99.72%, NO3 -1 0.0009%.

[0021] Wherein, the above-mentioned cleaning agent composit...

Embodiment 2

[0023] Add 10kg of silver nitrate to 10.5L of deionized water, stir to dissolve, filter, then add 21.5L of sodium hydroxide solution with a mass fraction of 10% to form a silver oxide precipitate, and finally add 0.28kg of purifying agent composition and stir for 2.5h, filter out For silver oxide precipitation, wash the precipitate twice with deionized water, drain and centrifuge, gradually add it to 17kg of concentrated sulfuric acid with a mass fraction of 95-98% and a temperature of 85°C to dissolve it in batches under stirring, and continue heating To 139°C, keep warm for 3.5 hours, after cooling, slowly pour the solution into 13MΩ.CM deionized water to precipitate silver sulfate, then filter out silver sulfate, rinse twice with 0.65L ethanol with a mass fraction of 99.5% Dry to obtain 8.26kg of high-purity silver sulfate, the yield is 89.98%, the purity is 99.81%, NO3 -1 is 0.00087%.

[0024] Wherein, the scavenger composition mentioned above is a mixture of citric acid,...

Embodiment 3

[0026] Add 10kg of silver nitrate to 11L of deionized water, stir to dissolve, filter, then add 22L of sodium hydroxide solution with a mass fraction of 10% to form a silver oxide precipitate, and finally add 0.285kg of purifying agent composition and stir for 3 hours, filter out the silver oxide precipitate , washed the precipitate twice with deionized water, drained and centrifuged, and gradually added to 18kg of concentrated sulfuric acid with a mass fraction of 95-98% and a temperature of 90°C to dissolve it in batches under stirring, and continued heating to 142°C , continue to keep warm for 4 hours, after cooling, slowly pour the solution into 13MΩ.CM deionized water to precipitate silver sulfate, then filter out silver sulfate, wash twice with 0.8L ethanol with a mass fraction of 99.5%, and then dry it. High-purity grade silver sulfate 8.08kg, yield rate is 88.02%, and purity is 99.82%, NO3 -1 is 0.00085%.

[0027] Wherein, the above-mentioned cleaning agent compositio...

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Abstract

The invention discloses a method for synthesizing high-purity silver sulfate, which compries the following steps: adopting industrial grade silver nitrate as a raw material; adding deionized water, stirring for dissolving, and filtering; adding sodium hydroxide solution of a theoretic quantity to generated silver oxide sediment; finally, adding clarificant combination and stirring; filtering out silver oxide sediment; collecting purified silver oxide according to a conventional method. The purity of silver sulfate obtained according to the method is higher than 99.7 percent; the nitrate index is equal to or lower than 0.001 percent. Compared with the prior art, the method has the advantages that the purification process is safe, simple and convenient; energy conservation and emission reduction are realized; the defects of a cumbersome replacement reaction silver sulfate synthesizing method and a long direct silver sulfate synthesizing method are overcome; the requirements of green chemical engineering and environment protection are met; the product quality of the silver sulfate obtained according to the method is stable; the silver sulfate obtained according to the method has an industrialized production prospect.

Description

technical field [0001] The invention relates to a method for synthesizing silver sulfate, in particular to a method for synthesizing high-purity silver sulfate. Background technique [0002] Silver sulfate is colorless crystal or white crystalline powder, which gradually turns black when exposed to light, and decomposes at 1085°C. Soluble in nitric acid, ammonia water and concentrated sulfuric acid, slowly soluble in 125 parts of water and 71 parts of boiling water, insoluble in ethanol. It is slightly soluble in pure water, and it will be increased by the decrease of the pH of the solution environment. When the H+ concentration is large enough, there will be obvious dissolution. For the colorimetric determination of nitrite, vanadate, phosphate and fluorine. Determination of ethylene, used as an analytical reagent. It is used as a catalyst in the determination of chemical oxygen demand in water. [0003] The structural formula of silver sulfate is as follows: [0004] ...

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
Owner TAICANG HUSHI REAGENT
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