The method given above is difficult to apply when solutions containing soluble cyanides of zinc and other metals require to be titrated. “ A white
Since acidity of the ore causes decomposition of the cyanide, an obvious method of reducing the loss is to add alkali in some form. Before
The ordinary gangue of most ores (silica and silicates of the alkalies and alkaline earths) exercises no direct influence on the cyanide solution. The carbonates
These methods are described here for convenience, as being more intelligible after the chemistry of the process has been discussed. The necessity of the presence
When the pyrites occur in tailings which have been subjected to the action of the weather for some time before treatment, compounds are formed which
It was generally believed at one time that the precipitation of gold and silver by zinc was effected by simple displacement, according to the equation:
The discovery that metallic gold is soluble in potassium cyanide came after studying the action of cyanides on plates of gold, and announced that they
Gold Leaching done in round vats, constructed of wood, concrete, or iron and steel. If wood is used it is covered by a coating of paraffin paint,
The cyanide is usually dissolved in a little water before being added to the stock solution, as the amount of KCy present is more easily
Various gold bullion making methods have been suggested for effecting the elimination of the zinc and other base metals. The chief ones are: Direct fusion