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Environment-friendly and efficient production method of high-purity silver nitrate

A production method and technology of silver nitrate, applied in the directions of nitric acid, separation method, chemical instrument and method, can solve problems such as outstanding environmental protection problems, unstable quality, low efficiency, etc., and achieve low cost, high product purity and high quality. Effect

Pending Publication Date: 2020-10-02
中船重工黄冈贵金属有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide an environmentally friendly and highly efficient method for producing high-purity silver nitrate for the problems of low technical efficiency, outstanding environmental protection problems, high cost, and unstable quality in the existing industrialized production of high-purity silver nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 800kg of national standard 1# silver ingots and go through the ultrasonic cleaning and drying system, and wash away the stains on the silver ingots through high-purity water washing, 3-5% pickling, 3-5% lye and other processes. Put into the silver dissolving reactor, add high-purity water, 65-68% analytical pure nitric acid, heat, and react to obtain silver nitrate solution. Add a certain concentration range of hydrogen peroxide in the pretreatment part of the exhaust system to absorb nitrogen oxides, and the absorption liquid is reused. The NOx concentration in the exhaust pipe is always less than 125ppm, which is the discharge standard. The silver nitrate solution obtained by the reaction was transferred to the impurity removal tank by vacuum, heated to 80-85°C, added the impurity remover, left to stand for 1 hour, and filtered to a 1 μm silicon carbide filter under negative pressure, then transferred to the neutralization tank. Adjust the pH value of the silver ...

Embodiment 2

[0055] Take 850kg of national standard 1# silver ingots and go through the ultrasonic cleaning and drying system, and wash away the stains on the silver ingots through high-purity water washing, 3-5% pickling, 3-5% lye and other processes. Put into the silver dissolving reactor, add high-purity water, 65-68% analytical pure nitric acid, heat, and react to obtain silver nitrate solution. Add a certain concentration range of hydrogen peroxide in the pretreatment part of the exhaust gas system to absorb nitrogen oxides, and the absorption liquid is reused. The NOx concentration in the exhaust pipe is always less than 133ppm, which is the discharge standard. The silver nitrate solution obtained by the reaction was transferred to the impurity removal tank by vacuum, heated to 80-85°C, added the impurity remover, left to stand for 0.5h, and filtered to a 1μm silicon carbide filter under negative pressure, then transferred to the neutralization tank. Adjust the pH value of the silver...

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Abstract

The invention discloses an environment-friendly and efficient production method of high-purity silver nitrate. The method includes steps of: firstly, performing a reaction on a silver ingot with nitric acid to obtain a silver nitrate solution; purifying the silver nitrate solution, and sequentially carrying out efficient evaporation under reduced pressure, efficient crystallization, solid-liquid separation, drying, crushing and packaging operations. According to the method, a finished product of 1150-1210 kg of high-purity silver nitrate crystals can be produced from the time when 800-850 kg of silver ingots enter a production line for 22-22.5 hours; hydrogen peroxide is used for absorbing nitric oxide into nitric acid for cyclic utilization; after impurities are removed through the impurity removing agent, filtration is conducted through combination of the negative-pressure filter element and the positive-pressure filter element, efficient solid-liquid separation of silver nitrate isachieved through a suction filtration mode of combination of the pneumatic diaphragm pump and vacuum negative pressure after efficient reduced-pressure evaporation; compared with the prior art, the production method of high-purity silver nitrate has the advantages of being environmentally friendly, efficient, low in cost and high in quality.

Description

technical field [0001] The invention relates to a production method of silver nitrate, in particular to an environment-friendly and efficient production method of high-purity silver nitrate. Background technique [0002] As a silver chemical product, silver nitrate is the raw material and basis for the production of other silver high value-added products, and has been widely used in many fields such as mirror making, medicine, electroplating, and ultrafine silver powder. With the improvement of product quality requirements in downstream industries, silver nitrate is gradually developing towards high purification. [0003] The main method of preparing high-purity silver nitrate at present is to add nitric acid to dissolve the reaction process of silver, and then obtain silver nitrate crystals through processes such as impurity removal and filtration, evaporation and concentration, crystallization, centrifugation, drying, and packaging. During the reaction process of adding n...

Claims

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Application Information

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IPC IPC(8): C01G5/00C01B21/40B01D36/00
CPCC01G5/00C01B21/40B01D36/006C01P2006/80
Inventor 柳忠琪周也涛张圣欢林松彭戴
Owner 中船重工黄冈贵金属有限公司
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