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Potassium cyanide is a compound with the formula KCN. It is a colorless salt, similar in appearance to sugar , that is highly soluble in water. Most KCN is used in gold mining , organic synthesis , and electroplating .
It is the binary cyanide of gold(I). It is an odourless, tasteless yellow solid. [4] Wet gold(I) cyanide is unstable to light and will become greenish. [4] Gold(I) cyanide itself is only of academic interest, but its derivative dicyanoaurate is an intermediate in gold cyanidation, the extraction of gold from its ores. [5]
John Stewart MacArthur developed the cyanide process for gold extraction in 1887. The expansion of gold mining in the Rand of South Africa began to slow down in the 1880s, as the new deposits found tended to contain pyritic ore. The gold could not be extracted from this compound with any of the then available chemical processes or technologies. [5]
Potassium dicyanoaurate (or potassium gold cyanide) is an inorganic compound with formula K[Au 2]. It is a colorless to white solid that is soluble in water and slightly soluble in alcohol. The salt itself is often not isolated, but solutions of the dicyanoaurate ion ([Au(CN) 2] −) are generated on a large scale in the extraction of gold from ...
Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. On top of the large mounds of ore, are sprinklers dispensing a solution of cyanide. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from ...
Cyanide is quantified by potentiometric titration, a method widely used in gold mining. It can also be determined by titration with silver ion. It can also be determined by titration with silver ion. Some analyses begin with an air-purge of an acidified boiling solution, sweeping the vapors into a basic absorber solution.
The crust formed on the lid was ground to powder and boiled with water to remove the calomel. Calx – calcium oxide; was also used to refer to other metal oxides. Chalcanthum – the residue produced by strongly roasting blue vitriol (copper sulfate); it is composed mostly of cupric oxide. Chalk – a rock composed of porous biogenic calcium ...
Gold(I) iodide – AuI; Gold(I) selenide – Au 2 Se; Gold(I) sulfide – Au 2 S; Gold(III) bromide – (AuBr 3) 2; Gold(III) chloride – (AuCl 3) 2; Gold(III) fluoride – AuF 3; Gold(III) iodide – AuI 3; Gold(III) oxide – Au 2 O 3; Gold(III) selenide – Au 2 Se 3; Gold(III) sulfide – Au 2 S 3; Gold(III) nitrate – Au(NO 3) 3; Gold(V ...