Process for preparing auric potassium cyanide

Abstract

The present invent discloses a preparation method of gold potassium cyanide. Potassium cyanide and gold are raw material. Every gram of gold matches 930-980 grams of potassium cyanide. The procedure is: 1) pressing gold, i.e. rolling gold into thin foil electrode, 2) electrolysis, i.e. using gold foil as anode, stainless steel plate as cathode, potassium cyanide solution as electrolyte, electrolysis reaction is carried out in a membrane cell and the anode gold foil is gradually dissolved as Au(CN)2 during electrolysis, 3) purification, i.e. when the gold is totally dissolved out, low temperature cooling crystallization is adopted to purify the product gold potassium cyanide and separating residual potassium cyanide, 4) condensation,5) repeating purification ,6) condensation, 7) oven drying, i.e. baking the gold potassium cyanide crystal in a vacuum oven to obtain end product. Adopting the present invention technology, electrolysis time is shortened, repeating times of purification are decreased, quality and yield rate are increased.

Description

technical field

[0001] The invention relates to a preparation method of potassium gold cyanide. Background technique

[0002] At present, the demand for gold plating has been showing an increasing trend. Potassium gold cyanide is the main plating activator used in modern gold plating technology. Potassium gold cyanide was prepared by rekinic acid method. The chemical method has the disadvantages of high impurity content, low gold salt purity, and large gold loss. There is also the preparation of potassium gold cyanide by electrolysis, which can avoid the shortcomings of chemical methods, but when preparing 1200-1300 grams of potassium cyanide per kilogram of gold, the quality and yield of potassium gold cyanide are low. It is a low-grade gold salt. It takes about 12 hours for electrolysis, 4-5 times of purification, and the yield per kilogram of gold is about 14.2-14.3 bottles. Contents of the invention

[0003] The invention provides a preparation method of potassium g...