The cyanidation plants has been using sodium cyanide to dissolve the gold from the ore in order to recover the gold from the leaching solution. The formula is as follows: 2Au+4NaCN+O2+2H2O2Na Au 2+2NaOH+H2O2 2Au+4NaCN+H2O22Na Au 2+2NaOH
When the gold has solidified, the molten silver chloride collected on the surface is run off, carrying with it a small proportion of gold. When silver is the chief impurity in the gold, as in that found in Australia, the process is specially applicable. The gold has a degree of purity of 99.1 to 99.7 per cent.
The gold could not be extracted from this compound with any of the then available chemical processes or technologies. In 1887, John Stewart MacArthur, working in collaboration with brothers Dr Robert and Dr William Forrest for the Tennant Company in Glasgow, Scotland, developed the MacArthur Forrest Process for the extraction of gold ores. By ...
Gold is the major source of gold separated using solvent extraction technique. The gold extraction usually conducted in aqueous chloride media continued by using high molecular weight amines or tertiary amines diluted in nonpolar organic solvents. This way, gold in the form of anionic tetrachloroaurate is
Silver and gold are extracted by the cyanide process . After the preliminary crushing and concentration by froth floatation process, the ore is leached with dilute solution of sodium cyanide made alkaline by adding lime kept agitated by a current of air.
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