Method for producing high-purity silver nitrate

A production method, silver nitrate technology, applied in chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problems of low product purity and achieve high quality, improved product quality, and low metal content.

Inactive Publication Date: 2011-05-04
中科铜都粉体新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the present invention is exactly to solve the problem that the product purity that existing silver nitrate production method produces is not high, provides a kind of production method of high-purity silver nitrate

Method used

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  • Method for producing high-purity silver nitrate

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Embodiment Construction

[0019] A kind of method of producing high-purity silver nitrate of the present invention, it may further comprise the steps:

[0020] (1) Reaction: Take silver and wash it with pure water to remove surface dirt, then place it in a reaction kettle, add distilled pure nitric acid in batches, keep excess silver during the reaction, heat to 70°C, under negative pressure Remove excess nitrogen compounds and adjust the pH value of the reaction solution to PH3.5;

[0021] (2) Hydrolysis: add the above-mentioned reaction solution into the hydrolysis kettle, dilute it with pure water until the density is 1.65g / cm3, add the impurity removal agent magnesium oxide, stir slowly, then cool and stand for 13 hours, filter to remove impurities, and obtain the filtrate;

[0022] (3) Evaporation and crystallization: send the filtrate after removing impurities into the evaporation and crystallization kettle, evaporate under reduced pressure, stir slowly, and cool and crystallize when the specific...

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Abstract

The invention discloses a method for producing high-purity silver nitrate, comprising the following steps of: (1) reacting: flushing silver with purified water, placing the flushed silver in a reaction kettle, adding pure nitric acid, keeping the silver to be excessive, heating to 70DEG C, removing excessive nitrides and adjusting the pH value of a reaction solution; (2) hydrolyzing: adding the reaction solution in a hydrolysis kettle, flushing and diluting until the density is 1.6-1.7g/cm<3>, adding an impurity removing agent, standing for 10-16 hours and filtering to obtain filtrate; (3) evaporating and crystallizing: carrying out the pressure reduction and evaporation on the filtrate subjected to the impurity removal and cooling and crystallizing when the specific gravity is 3.2g/cm<3>; and (4) centrifuging and drying: after centrifuging and separating a crystal which is crystallized and separated out, allowing a solid to enter vacuum drying equipment, heating, decompressing and drying for 24 hours to obtain a pure silver nitrate finished product. The silver nitrate produced by the method has low metal content and high quality.

Description

technical field [0001] The invention relates to a production method of silver nitrate, in particular to a production method of high-purity silver nitrate. Background technique [0002] The photosensitive industry is a multidisciplinary and multi-engineering comprehensive fine chemical industry. For photosensitive materials, the purity of the raw materials required for the preparation of the materials has been confirmed by the development history of the photosensitive industry in many countries in the world. The main raw material needed to prepare photosensitive emulsion - silver nitrate. But over the years, due to poor quality and various harmful impurities in silver nitrate, it is difficult to produce high-grade negative film, the uniformity and stability of the product are poor, and the performance of the later stage often deteriorates prematurely and becomes a defective product. [0003] The quality status quo of silver nitrate product no matter it is photographic grade,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G5/00
Inventor 张雅君欧阳准祖兴贵刘瑜吴存坤
Owner 中科铜都粉体新材料股份有限公司
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