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

Inactive Publication Date: 2013-09-11
桐柏鑫泓银制品有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The requirements for reaction conditions are high, the reaction speed is difficult to control, and it is easy to introduce new impurities, which is far from meeting the requirements of photographic silver nitrate

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of disposable crystallization prepares the method for photographic grade silver nitrate, it comprises the following steps:

[0020] a. Take the national standard 1 # 13 kilograms of silver ingots are put into the reactor, and then 11 liters of 61% concentrated nitric acid are added to the reactor;

[0021] b. Heating the reactor to increase the temperature of the solution gradually. When it reaches 60°C, the reaction gradually becomes violent. Continue heating to bring the solution temperature to 81°C to allow it to fully react. After the reaction is over, continue heating for 2 hours until it is invisible Until the nitrogen oxide overflows, the pH value of the solution is in the range of 1 to 2;

[0022] c. transfer the above-mentioned prepared solution into an impurity removal container with a stirring device, stir at a speed of 50 rpm, add silver oxide in the process of stirring, and the addition is 5 grams. When the pH of the solution is 7.6, stop stirring,...

Embodiment 2

[0026] A kind of disposable crystallization prepares the method for photographic grade silver nitrate, it comprises the following steps:

[0027] a. Take the national standard 1 # 178 kilograms of silver ingots are put into the reactor, and then 16 liters of 69% concentrated nitric acid are added to the reactor;

[0028] b. Heat the reactor to increase the temperature of the solution gradually. When it reaches 60°C, the reaction will gradually become violent. Continue heating until the solution temperature reaches 90°C to make it fully react. After the reaction is over, continue heating for 3 hours until the Until the nitrogen oxide overflows, the pH value of the solution is in the range of 1 to 2;

[0029] c. transfer the solution prepared above into the impurity removal container with a stirring device, stir at a speed of 50 rpm, add silver oxide in the process of stirring, and the addition is 70 grams. When the pH of the solution is At 8.4, stop stirring, and filter after...

Embodiment 3

[0033] A kind of disposable crystallization prepares the method for photographic grade silver nitrate, it comprises the following steps:

[0034] a. Take the national standard 1 # 15 kilograms of silver ingots are put into the reactor, and then 13.5 liters of 65% concentrated nitric acid are added to the reactor;

[0035] b. Heat the reactor to increase the temperature of the solution gradually. When it reaches 60°C, the reaction will gradually become violent. Continue heating to bring the solution temperature to 80-90°C to make it fully react. After the reaction is over, continue heating for 2-3 hours , until no overflow of nitrogen oxides can be seen, so that the pH value of the solution is in the range of 1 to 2;

[0036] c. transfer the solution prepared above into the impurity removal container with a stirring device, stir at a speed of 50 rpm, add silver oxide in the process of stirring, and the addition is 60 grams. When the pH of the solution is At 8 o'clock, stop st...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G5/00
Inventor 王学成
Owner 桐柏鑫泓银制品有限责任公司
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