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In the electroplating of gold which electrolyte is used?
potassium aurocyanide
Is potassium aurocyanide used as an electrolyte in electroplating of gold?
A common electrolyte bath will normally contain either a potassium-cyanide solution or a cyanide-free solution based on sulfites or chlorides.
How gold is extracted from its alluvial gravel?
IMPORTANT ORE: ALLUVIAL GRAVEL MAC ARTHUR FORREST cyanide process crushing and concentration: the ore is crushed and then concentrated by n froth flotation process roasting : the concentrated ore is roasted in excess of air when the impurities are oxidised and escape as their volatile liquid treated with KCN: IT IS TRETED WITH dil kcn for 24 hrs the gold dissolve from it and form complex solution of potassium aurocyanide 4au + 8KCN + 2HO + O GIVES 4K(AU(CN2)) + KOH 2 2 precipitation of gold : the solution of filtrate is remove and gold is precipitated anode:impurities cathode:gold electrolyte:aucl3 +hcl onpassing through current the pure metal precipitated in cathode
Does gold react with any elements?
Mercury (Hg)Historically, mercury was used extensively in hydraulic gold mining in order to help the gold to sink through the flowing water-gravel mixture. Thin mercury particles may form mercury-gold amalgam and therefore increase the gold recovery rates. Large scale use of mercury stopped in the 1960s. However, mercury is still used in small scale, often clandestine, gold prospection. Total use of mercury in placer mining in California has been estimated to more than 4500 tons (10,000,000 lbs). Mercury was also used in silver mining. And in the process of gilding (gold plating) silver plate.Cyanide (HCN)Cyanide solutions are used in the extraction of gold from low grade ore. The reaction in the Elsner Equation is as follows :4Au + 8NaCN + O2 + 2H2O -> 4NaAu(CN)2 + NaOHThe gold is then recovered from the the soluble aurocyanide complex by plating out.An Aside: Walking across tailings area you can smell the sweet cyanide aromaAqua Regia (HNO3 + HCl Solution)This is the historic method of dissolving gold . Higraders in gold camps ofhen are found by watching chimneys to see the brown nitrous fumes from boilling off the acid to recover the gold.
