Method for preparing photographic-grade silver nitrate through one-time crystallization

A silver nitrate, disposable technology, applied in chemical instruments and methods, silver compounds, silver compounds and other directions, can solve the problems that the reaction speed is difficult to control, the photographic grade silver nitrate cannot be reached, the reaction conditions are high, and the production cost is low. , The effect of good sensitivity and high purity
CN101628730BInactive Publication Date: 2013-09-11桐柏鑫泓银制品有限责任公司 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
桐柏鑫泓银制品有限责任公司
Publication Date
2013-09-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing photographic-grade silver nitrate through one-time crystallization, comprising the following control conditions of temperature control, concentration control and purifying agent selection in the silver dissolving process, addition proportion and critical point identification, concentration temperature control, terminal point definition, crystallization time and drying temperature and the like. As the key production factors are well selected and controlled, the silver nitrate prepared by the invention features high purity and low impurity content, can be used for preparing film emulsion, has good light sensitivity and low fog density, can reach the standard of photographic-grade silver nitrate by crystallization for once, and has low production cost, short production cycle, high yield and small loss rate of products.
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Description

technical field

[0001] The invention belongs to the technical field of preparation methods of silver nitrate, in particular to a method for preparing photographic grade silver nitrate by one-time crystallization. Background technique

[0002] Photographic grade silver nitrate is currently the highest level in the field of silver nitrate production. It has high requirements for the prepared silver nitrate, mainly including low impurity content, long shelf life, and the prepared photographic halogen agent. Low. The silver nitrate produced by the general method is difficult to meet the needs of photography. The production of photographic silver nitrate by the conventional method requires secondary crystallization, or even multiple crystallization, and the impurity removal effect is not good, the yield of silver nitrate is low, the production cycle is long, and the shelf life is short. Many deficiencies.

[0003] Some use the method of passing oxygen to remove impurities, such...

Claims

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