the cyanide process of gold extraction: a text-book for the use of mining students, metallurgists, and cyanide operators 1906 reprint softcover. condition: new. this is a reprint of the original work published in 1906. we are professionally publishing these works using the classic text and artwork.
extraction. silver is extracted from the ore-argentite \ ag 2s\ . the process of extraction of silver is called as cyanide process as sodium cyanide solution is used. the ore is crushed, concentrated and then treated with sodium cyanide solution. this reaction forms sodium argento cyanide \ na ag cn 2 \ .
extraction of gold using cyanide gold is found in very low concentrations in the ore from which it is mined. to collect the gold from the ore it needs to be separated from the other minerals in the ore. to do this the gold needs to be made into a soluble form so that it can be separated from the other minerals as gold is insoluble.
of those methods, the cyanide leaching process cyanidation , is the method that is commonly used the most often to do this. as the name implies, the main component in the process is a sodium cyanide solution. this article will give a general overview about how this important, 120 year old gold mining process works.
carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution. leaching gold from sulfide ores is difficult, at best. generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30%, which is not a worthwhile venture.
if the tower grinding machine is used to implement the edge grinding and immersion process in gold mines, it will be a major innovation in the cyanide gold extraction process. the cyanide gold extraction process also suits for copper leaching, zinc leaching, sliver leaching, etc.
bromine acts more energetically than chlorine, and has also been employed in the extraction. the recovery of the gold is effected similarly, and the bromine is then liberated by the action of chlorine, but it is impossible to prevent loss of bromine. cyanide-process the extraction of gold by the cyanide-method is of great technical importance.
extraction of gold by cyanide leaching the process of cyanide leaching is mainly used where the earth has a high gold concentration making an industrial development worthwhile. for this process the gold-bearing rock is crushed to sand and dust.
cyanide process, also called macarthur-forrest process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. the process was invented in 1887 by the scottish chemists john s. macarthur, robert w. forrest, and william forrest.
process of cyanide gold extraction. in addition it contained 2 to 3 lbs. per ton of thiosulphate and had an initial oxygen content of less than 2 mg. per litre. the thiosulphate was inert as regards to this example practice; at normal temperatures practically no reaction took place between thiosulphate and cyanide.
cyanide process extraction of gold through cyanidation the ore is grounded and crushed. if the ore containing the gold has other forms now the gold is soluble. this method of making soluble gold is known as leaching. the slurry formed is treated with activated zinc or carbon for the
in the chlorination process the gold requires only free chlorine and water for its solution, as the chloride of gold is soluble in water, but in the cyanide process there are required, first free cyanogen to form the cyanide of gold, and then free cyanide of potassium to form the soluble double cyanide.
the fact that many millions of gold have been extracted by the cyanide process, during the last five or six years, from south african tailings which could not be profitably worked by any other method previously tried upon them, lends a peculiar practical interest to this branch of metallurgy.
introduction to gold and silver leaching. the cyanide leaching process is the most important method ever developed for extracting gold from its ores. the early development of the process is attributed to a scotchman, john stewart mac arthur, in collaboration with the forrest brothers. the method was introduced into south africa in 1890.