Production method of photography-level silver nitrate

A production method and technology of silver nitrate, applied in chemical instruments and methods, silver compounds, silver compounds and other directions, can solve problems such as poor quality of silver nitrate products, and achieve the effects of good product performance, high purity and good stability

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
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Problems solved by technology

[0003] Purpose of the present invention is exactly to solve the problem that the silver nitrate product quality that existing silver nitrate production method produces is poor, provides a kind of production method of producing photographic grade silver nitrate

Method used

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Embodiment Construction

[0014] A kind of production method of the present invention produces photographic grade silver nitrate, it comprises the following steps:

[0015] (1) get pure nitric acid and deionized water for subsequent use;

[0016] (2) Put silver ingots with a purity greater than 99.9% into the reaction kettle, add pure nitric acid, heat up to 63°C, and vacuum the reaction kettle to make the NO produced by the reaction 2 After the reaction is completed, the silver remains in excess to obtain the reaction solution;

[0017] (3) Take the reaction solution and add it to the dilution tank, add pure water to dilute until the specific gravity of the solution is 1.4-1.5g / cm3 and then let it stand for 24 hours;

[0018] (4) The impurity removal process, adding the impurity removal agent magnesium carbonate, the mechanical stirring speed is 35-50r / min, and after 24 hours of reaction, the solid-liquid separation is carried out, so that the liquid phase is purified to the greatest extent;

[0019...

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Abstract

The invention discloses a production method of photography-level silver nitrate, comprising the following steps: (1) taking pure nitric acid and deionized water for standby; (2) adding a silver ingot the purity of which is more than 99.9% into a kettle, adding the pure nitric acid, heating to 60-65 DEG C, vacuumizing the kettle, and keeping excess silver, thus obtaining reactive fluid; (3) adding the reactive fluid into a diluting tank, diluting the reactive fluid with pure water until the specific gravity of solution is 1.4-1.5g/cm<3>, and standing for 24 hours; (4) adding decontamination agent (magnesium carbonate), and carrying out solid-liquid separation; (5) after separation, causing liquid phase to enter a condensed crystallization kettle, evenly stirring at the revolving speed of 25-30r/min to prepare silver nitrate crystal; and (6) filtering and drying the silver nitrate crystal, and drying the crystal, thus obtaining the photography-level silver nitrate. The silver nitrate produced by method provided by the invention has the advantages of high purity, good identity and good stability.

Description

technical field [0001] The invention relates to a production method of silver nitrate, in particular to a production method of photographic grade silver nitrate. Background technique [0002] Silver nitrate is one of the basic raw materials for the preparation of photosensitive emulsion. Its quality directly affects the photosensitive performance of photosensitive film, and affects the identity and stability of the product. Due to the limitation of the backward production technology adopted in the original traditional production technology of silver nitrate, the silver nitrate product has many impurities and its product quality is not up to standard, which brings difficulties to the production of high-grade negative film. At the same time, the identity of the product is poor, and the performance in the later stage often declines prematurely and becomes a defective product. It is far from satisfying the requirements of my country's photosensitive industry for silver nitrate....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G5/00G03C1/494
Inventor 张雅君欧阳准万代发曹建国刘瑜姚学慧
Owner 中科铜都粉体新材料股份有限公司
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