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Preparation method of silver potassium cyanide

A technology of silver potassium cyanide and potassium cyanide, which is applied in the direction of metal cyanide and complex cyanide, which can solve the problems of environmental pollution and inability to be recycled.

Active Publication Date: 2021-08-13
漯河瀚普环创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the actual production process, the sodium nitrate or potassium nitrate solution contained in the mother liquor is discharged after the silver potassium cyanide is extracted, which will cause certain pollution to the environment
[0006] See Chinese patents CN102874844A and CN1161935A, the above patents add alkaline substances during the production of silver cyanide potassium in the process of making silver cyanide from silver nitrate, neutralize the silver nitrate solution, and add the neutralized silver nitrate solution to the cyanide solution In the process, the nitrate formed in it is dissolved in the silver cyanide aqueous solution, and the solution is stirred statically, and the silver cyanide crystallizes and precipitates. These cyanide-containing nitrate solutions cannot be recycled, so they are treated as waste With the discharge of waste water

Method used

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Effect test

preparation example Construction

[0022] The invention relates to a preparation method of potassium silver cyanide, which uses silver nitrate to react with alkaline substances such as carbonate or hydroxide to generate silver carbonate or silver hydroxide, and then reacts with potassium cyanide to generate potassium silver cyanide , Completely change the process of using silver nitrate to react with cyanide to generate silver cyanide in the production of potassium silver cyanide.

[0023] The reactions of silver carbonate or silver hydroxide can be listed as follows:

[0024] 2AgNO 3 +Na 2 CO 3 = 2NaNO 3 +Ag 2 CO 3 ↓

[0025] 2AgNO 3 +K 2 CO 3 =Ag 2 CO 3 ↓+2KNO 3

[0026] AgNO 3 +NaOH=AgOH+NaNO 3

[0027] AgNO 3 +KOH=AgOH+KNO 3

[0028] Since silver hydroxide is unstable, it will be oxidized to form silver oxide Ag when stored or heated in the air. 2 O+H 2 O, thus preferably the reaction of generating silver hydroxide and the reaction of generating potassium silver cyanide will be carried ...

Embodiment 1

[0030] Embodiment 1, silver carbonate method produce potassium silver cyanide

[0031] 1. Production of silver carbonate and recovery of potassium nitrate

[0032] 1. The production process of silver nitrate is the same as the well-known production method, and the specific process is no longer described.

[0033] 2. The production of silver carbonate and the recovery method of potassium nitrate: take 1000g of silver nitrate and put it into the reaction vessel, add water with a weight ratio of 1-5 times to make it completely dissolve, then heat it to 70°C-85°C, slowly pour it into the above solution under stirring Add 20% potassium carbonate solution, adjust the pH value in the range of 7-10, and completely crystallize and precipitate the generated silver carbonate (white). When the liquid is colorless and transparent, stop adding potassium carbonate solution and stop stirring. After the silver carbonate is completely precipitated, filter to obtain silver carbonate solid and p...

Embodiment 2

[0043] Embodiment 2, silver hydroxide method are produced silver cyanide potassium

[0044] The response is as follows:

[0045] AgOH+2KCN=K[Ag(CN) 2 ]+KOH

[0046] 1. Put potassium cyanide, silver hydroxide and water in a ratio of 1:0.5:8, first add 8000ml of water to the reactor, and heat it to 60-90°C, then add 1000g of potassium cyanide, stir to dissolve and put in hydrogen 500g of silver oxide was dissolved completely to generate potassium silver cyanide solution.

[0047] 2. Concentrate the complete potassium cyanide silver cyanide solution under negative pressure until crystals are precipitated and stop concentrating.

[0048] 3. After cooling the concentrated solution to completely crystallize and precipitate silver potassium cyanide, filter to obtain silver potassium cyanide solid, move the solid into a centrifuge to rinse and remove carbonate to obtain pure silver potassium cyanide solid, recover the filtrate and put it into the next In the reaction solution of p...

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PUM

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Abstract

The invention provides a brand-new preparation method of silver potassium cyanide, which can recycle nitrate and is environment-friendly. The preparation method of the silver potassium cyanide comprises the following steps of: reacting silver nitrate with carbonate or hydroxide to generate silver carbonate or silver hydroxide, and reacting the silver carbonate or silver hydroxide with potassium cyanide to obtain the silver potassium cyanide. According to the preparation method, in the production process of the silver potassium cyanide, the production process in which silver nitrate reacts with cyanide to generate silver cyanide is omitted. Silver nitrate reacts with carbonate and other alkaline substances to generate silver carbonate precipitates (insoluble in water), meanwhile, generated nitrate and the aqueous solution do not contain cyanide, and the aqueous solution can be concentrated to recycle the nitrate so that the nitrate can be utilized as a chemical raw material. The environment is protected, resource waste is reduced, and harm to human bodies caused by harmful gas possibly generated when acidic substances are in contact with potassium cyanide in the production process of the silver potassium cyanide is eliminated.

Description

technical field [0001] The present invention relates to a kind of preparation method of cyanide, more specifically relate to a kind of preparation method of brand-new potassium silver cyanide. Background technique [0002] Potassium silver cyanide has been produced and applied for many years. Its production method is to react silver nitrate with cyanide to generate silver cyanide, and then react silver cyanide with potassium cyanide to generate potassium silver cyanide. In the intermediate process of producing silver cyanide with this method, a certain amount of hydrogen cyanide gas is produced and released. There is a potential safety hazard of hydrogen cyanide gas poisoning. When silver nitrate reacts with sodium cyanide or potassium cyanide to generate silver potassium cyanide, a large amount of sodium nitrate or potassium nitrate is formed thereupon. Since these available nitrates are mixed with cyanide substances, even if these nitrates are recovered due to being poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/11
CPCC01C3/11
Inventor 任博
Owner 漯河瀚普环创环保科技有限公司
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