Show volatilization OF COPPER AND LEAD i copper volatilizes readily in the dh loride volatilization process states the department of the interior budeau of mines copper forms from chlorine two salts cuprous chloride and cupric chloride cuprous chloride is the most stable at elevated temperatures the chlorides even at temperature below redness are volatile when heated the cupric salt changes chang es to cuprous and volatilizes as cuprous salt in an atmosphere of hydrochloric acid however the fumes of cuprous chloride may be partly raised to the cupric form hence collected fumes are usually mixtures of the two chlorides Oxy chlorides of copper may take some part in these changes b but according b to tess on collected copper chloride fumes not an import important anE one the reaction between sodium and calcium chloride and the oxidized ores of copper are rapid at moderate temperatures as extremes of neither times nor temperature are required the volatilization process for copper from ores is desirable commer I 1 ca bially ally the percentage of copper in the fume runs high b and the reduction of the chloride fume to metal by fusing it with lime and coke affords a sim simple ole method of treatment the presence of some sulphur in copper ores probably helps rather than hinders the reactions on the other I 1 hand if the proportion of sulphide is large copper occurs in the fume when reduced such fume 6 gives ives considerable copper matte alon along with the metallic copper little iron is vol j utilized and the matte oc curing with the metal runs high in in copper lead is usually the most easily volatilized of all the metals j thus far investigated b lead has been present in nearly every kind of ore treated by volatilization at the intermountain tion of the bureau of mines and in nearly every test its re 1 covery or tx extraction traction has been higher than that of any other j mineral constituent I 1 |