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Method for recycling silver powder ammonia prepared by hydrazine hydrate reaction

A technology for recovery of hydrazine hydrate and ammonia, which is applied in the field of environmental protection and energy saving, can solve the problems of undiscovered ammonia, etc., and achieve the effects of reducing environmental risks and production risks, reducing discharge capacity, and reducing costs

Active Publication Date: 2017-03-29
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the search of the prior art, no technical report has been found that the recovered ammonia is directly used as a reaction raw material instead of being converted into a by-product of ammonia

Method used

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  • Method for recycling silver powder ammonia prepared by hydrazine hydrate reaction
  • Method for recycling silver powder ammonia prepared by hydrazine hydrate reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] S1: After the reaction of hydrazine hydrate, the mixed solution I obtained by silver powder and ammonia-containing mother liquor was obtained, and 400ml mixed solution I was added to the round bottom flask of the above-mentioned experimental device of 1000ml. The volume ratio of silver powder accounted for about 50%, mixed solution I The temperature was 54°C.

[0047] The above round bottom flask is heated, and the generated ammonia gas enters into S2; when the temperature is lower than 80°C, only a small amount of gas inside the round bottom flask begins to escape, and when the temperature rises to 85°C, a large amount of gas escapes, and the constant temperature is 91°C 60min, stop heating, obtain the mixed solution II that silver powder and ammoniacal mother liquor are formed;

[0048] S2: Use silver nitrate solution to absorb the ammonia gas produced by S1 mixed solution I. The constant temperature time in S1 is the absorption time of silver nitrate. The absorbed si...

Embodiment 2

[0054] The steps are the same as in Example 1, and the result is that the initial concentration of ammonia is 0.72 mol / L, and after a constant temperature of 98° C. for 60 minutes, the residual concentration of ammonia is 0.049 mol / L, and the recovery rate of ammonia is 93.21%.

Embodiment 3

[0056] S1: After the reaction of hydrazine hydrate, a mixed solution I consisting of silver powder and ammonia-containing mother liquor is obtained. Take 400ml of the mixed solution and add it to a 1000ml round bottom flask. The volume ratio of the silver powder is about 50%, and the temperature of the mixed solution is 50°C.

[0057] Heating the round bottom flask, the generated ammonia gas enters into S2. When the temperature is lower than 80°C, only a small amount of gas inside the round bottom flask begins to escape. When the temperature rises to 85°C, a large amount of gas escapes. Keep the temperature at 95°C for 40 minutes. , stop heating to obtain mixed solution II composed of silver powder and ammonia-containing residual leaves;

[0058] S2: Use silver nitrate solution to absorb the ammonia gas produced by S1 mixed solution I, and the absorbed silver nitrate solution is used in the next hydrazine hydrate cycle reaction; the mixed solution II is left to stand for 40 min...

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Abstract

The invention relates to a method for recycling silver powder ammonia prepared by hydrazine hydrate reaction. The method comprises the following steps of: obtaining a mixed solution I of silver powder and ammonia-containing mother liquor after hydrazine hydrate reaction, and heating the mixed solution I to obtain mixed solution II of ammonia gas, silver powder and the ammonia-containing mother liquor; absorbing ammonia gas for recycling the mixed solution I by a silver nitrate solution, using the silver nitrate solution which absorbs the ammonia gas in next hydrazine hydrate circular reaction, and separating silver powder from ammonia-containing mother liquor for the mixed solution II to obtain silver powder IV and ammonia-containing residual liquor III; and carrying out steam stripping on silver powder IV to remove residual ammonia on the surface of silver powder to obtain sliver powder V, absorbing stripped ammonia gas by a silver nitrate solution, and using the silver nitrate solution which absorbs the stripped ammonia gas in next hydrazine hydrate circular reaction. According to the method, an environmental protection and control technology is combined with a chemical process technology, so that cyclic utilization of ammonia is directly realized, and reclamation, reduction and hazard-free treatment of ammonia in wastewater are achieved, and therefore, the environment is protected, and resources are saved.

Description

technical field [0001] The invention relates to ammonia recovery and recycling technology, in particular to a method for ammonia recovery and recycling of silver powder prepared by hydrazine hydrate reaction, which belongs to the field of environmental protection, energy saving and resource utilization. Background technique [0002] Environmental pollution is becoming more and more serious, and the attention to environmental protection is getting closer. Therefore, the concept of recycling combined with environmental protection and emission reduction has become a new focus and breakthrough in the field of environmental protection. Hydrazine hydrate reaction to prepare silver powder needs to use a large amount of ammonia water and ammonia gas to meet the requirements of silver powder preparation process and safety production. Ammonia gas is added, and then hydrazine hydrate is added to make the oxidation-reduction reaction proceed slowly under controllable conditions, so as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 李想梁银陈行祁更新陈晓
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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