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Method for directly synthesizing auro-potassium cyanide by controlling level

A direct technology of potassium aurous cyanide, applied in the field of potential control, can solve problems such as inability to use potassium aurous cyanide in actual production and affecting product quality, and achieve low production cost, high product quality and fast production speed Effect

Inactive Publication Date: 2004-03-10
张东山
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] 2. Adverse reactions affect product quality
[0011] When the concentration of potassium cyanide and hydrogen peroxide is high, side reactions can generate trivalent gold salt, cyanate and other impurities, which will affect product quality
Due to the above reasons, so far, this method can not be used for the actual production of potassium aurous cyanide

Method used

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  • Method for directly synthesizing auro-potassium cyanide by controlling level
  • Method for directly synthesizing auro-potassium cyanide by controlling level

Examples

Experimental program
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Embodiment

[0028] Add gold powder 1000g, pure water 2000mL in the reaction vessel 1 that stirrer 5 is housed; Heat to 60 ℃, stir, measure and show the gold potential in the reaction process with saturated calomel electrode 2, gold electrode 3, potentiometer 4, to reaction Add 30% H to container 1 2 o 2 Aqueous solution, the speed is 2-40mL / min, add 40% KCN aqueous solution, the speed is 10-20mL / min, add more KCN when the gold potential is high, and add more H when the gold potential is low 2 o 2 , control the gold potential between -600 ~ -700mv, add a total of 1.1 times the theoretical amount of KCN, and continue stirring after stopping the addition of liquid to complete the reaction. The resulting mother liquor KAu(CN) 2 Medium concentration can be as high as 30% or more. Filter the mother liquor while it is hot, cool and crystallize, centrifuge and dehydrate, wash and dry to obtain gold cyanide KAu(CN) with a purity of more than 99.9%. 2 .

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Abstract

Potassium cyanide and hydrogen peroxide are added into reaction container at certain speed and the gold potential is controlled in -400 mV to -800 mV during the reaction. The production of KAu(CN)2 in the method of the present invention has fast speed, high efficiency, high quality, less investment and low cost.

Description

(1) Technical field [0001] The invention relates to a method for producing potassium aurous cyanide, in particular to a method for directly synthesizing potassium aurous cyanide by using potential control. (2) Background technology [0002] For the production of potassium aurous cyanide, ion-exchange membrane electrolysis is mostly used in foreign countries, and the process flow is: raw material granulation-diaphragm electrolysis-evaporation concentration-cooling crystallization-centrifugal separation-drying. It is characterized by high product quality and is suitable for large-scale production. The key to the electrolysis method lies in the performance of the ion exchange membrane. The production technology of the membrane is proprietary to the manufacturer, and it is not yet mastered in China. At present, the high-quality potassium aurous cyanide used in China still needs to be imported. [0003] The domestic production of potassium aurous cyanide mostly adopts chemical ...

Claims

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Application Information

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IPC IPC(8): C01C3/11
Inventor 张东山
Owner 张东山
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