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Preparation method of potassium aurous cyanide

A technology of potassium aurocyanide and potassium cyanide, applied in the directions of coordinating cyanide, metal cyanide, electrolysis process, etc., can solve problems such as being unsuitable for large-scale production, achieve high direct yield, improve current efficiency, and facilitate feeding Effect

Inactive Publication Date: 2010-01-13
常州化工研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the method of above-mentioned patent document is all unsuitable for large-scale production

Method used

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  • Preparation method of potassium aurous cyanide
  • Preparation method of potassium aurous cyanide
  • Preparation method of potassium aurous cyanide

Examples

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Embodiment 1

[0036] See figure 1 The device used in the preparation method of potassium aurous cyanide of the present embodiment comprises an electrolytic cell 1, a diaphragm tank 2, an anode plate 3, a cathode plate 4, an anode rod 51, a cathode rod 52, a circulating water pump 6 and a heating tube 7.

[0037] The electrolytic cell 1 is composed of a waist-circular tank bottom plate and a waist-circular wall plate fixed around the tank bottom plate, and the material is polytetrafluoroethylene or plexiglass.

[0038] See figure 2 , the anode plate 3 is a one-piece folded plate made of iridium-coated titanium plate (MMO). The anode plate 3 includes a bottom plate 31 located on the bottom plate of the electrolytic cell 1 , a side plate 32 located on the inside of the front side cell wall of the waist circular wall plate of the electrolytic cell 1 , and an outer plate 33 extending out of the electrolytic cell 1 .

[0039] The anode rod 51 is a copper rod or a silver rod. Also fixedly conn...

Embodiment 2～ Embodiment 6

[0050] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1.

[0051] Table 1

[0052] Example 1

Embodiment 7

[0054] The rest of this embodiment are the same as Embodiment 1, the difference is: see Figure 4 and Figure 5 , there is no fixed connection thick gold sheet 8 on the anode rod 51, the time of current sudden drop will be extended to 18 hours like this. The weight of potassium aurous cyanide obtained at last is 33.024kg, and yield is 90.3%, and gold content is 68.36%, and is all identical with embodiment 1.

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Abstract

The invention discloses a preparation method of potassium aurous cyanide, which adopts the following devices: an electrolysis bath, a diaphragm tank, an anode plate and a cathode plate. The anode plate is made of a coated titanium alloy plate and comprises a bottom plate, a lateral plate and an outer plate, wherein the outer plate is fixed with an anode bar. The diaphragm tank is arranged on the upper end face of the bottom plate of the anode plate. The cathode plate comprises a plumbing plate, a transverse plate, and an outer plate, wherein the outer plate is fixed with a cathode bar. The preparation method comprises the following steps: rolling gold into a plurality of flash gold sheets, and then winding and clustering, and then dispersedly placing on the bottom plate of the anode plate around the diaphragm tank; adding a potassium cyanide solution into an anode chamber, adding a potassium hydroxide solution into a cathode chamber, heating to 40-65 DEG C and then electrifying and electrolyzing until the current is broken down. A potassium aurous cyanide solution in the anode chamber after being electrolyzed is post treated to obtain the potassium aurous cyanide. The mass percent of gold in the product prepared by the invention is more than 68.3 percent; moreover, the device can be massively produced.

Description

technical field [0001] The invention relates to a preparation method of cyanide, in particular to a preparation method of potassium aurous cyanide. Background technique [0002] Potassium aurous cyanide (KAu(CN) 2 ), commonly known as gold salt, is mainly used in gold plating process. The purity of potassium aurous cyanide directly determines the effect of gold plating, and the purity of potassium aurous cyanide is usually expressed by the mass fraction of gold in potassium aurous cyanide. The higher the mass fraction of gold in potassium aurous cyanide, the higher its purity and the less impurities it contains. In theoretical calculation, the mass fraction of gold in potassium aurous cyanide is 68.367%. And when the massfraction of gold in potassium aurous cyanide was 68.3%, the corresponding product purity was 99.9%; the massfraction of gold in potassium aurous cyanide was 68.2%, and the corresponding product purity had only 99.75%. The mass fraction of gold in the mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C01C3/08C01C3/11
Inventor 张强赵瑞平戴荣庆
Owner 常州化工研究所有限公司
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