Gold cyanidation processing systems is that many of the basic methods used in processing gold throughout the world. And cyanidation process has been patented in 1887 and was first used in mining
- Crown Mine, New Zealand in 1889
- Robinson Deep, South Africa in 1890
- Mercur, the United States in 1891
- El Oro, Mexico in 1900
- He Belliere, France in 1904
The function of the cyanidation method is to increase the recovery of gold and silver below 70% to better than 90% because of the gold minerals are encased by silica rocks are smooth and have a low grade that can be directly by the solvent extraction of cyanide. In some ores, particularly those who are most sulfidized, aeration (before the introduction of cyanide) from the ore in water at high pH can make elements such as iron and sulfur are less reactive to cyanide, and therefore the gold cyanidation process more efficient. In particular, oxidation of iron to iron (III) oxide and subsequent precipitation as iron hydroxide to minimize the loss of cyanide from the formation of iron cyanide complexes. Oxidation of sulfur compounds to sulfate ions to avoid the consumption of cyanide byproduct thiocyanate (SCN-).
Cyanide is a universal solvent in the processing of gold, and solvents commonly used in the processing of gold by cyanidation is NaCN, KCN, Ca (CN) 2 or a mixture of these three parts sianide. However, for solvents that are often used in the treatment process is being able to dissolve gold NaCN better than the other solvents. Cyanide NaCN, KCN, AgCN that is in use in the processing of gold and usually shaped salt crystals are also often used for photographic, metal plating and staining. In the metal plating, acid cyanide used in the cleaning process, hardening and metal plating metal to obtain seeds from the seed of pure gold metal.
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