In metallurgy, the operation of roasting, as a preliminary to chlorination, has for its object the expulsion of the sulphur, arsenic, antimony and other volatile substances existing in the ore, and the oxidation of the metals left behind, so as to leave nothing (except metallic gold) which can combine with chlorine when the ore is … Read more
The furnaces which have been designed with the object of saving the labour necessary to work the reverberatory furnaces may be divided into four classes: Stationary hearth furnaces, supplied with iron hoes moved by machinery by which the ore is rabbled. The O’Hara, Spence, Pearce Turret, Brown, Ropp, Edwards, Merton, and other furnaces are examples … Read more
The (Edwards Type) Mechanical Roaster was first developed in Australia for the roasting of gold and silver ores and concentrates. It can be built in units to handle from 20 to 200 tons per 24 hours. The overall height of this type of unit is low, an important advantage in installation. Dusting is eliminated because the … Read more