Abstract: A process and apparatus for continuous copper smelting, slag conversion, and production of blister copper in the same furnace by enriched oxygen containing gas injection.

Abstract: A process for the modification to existing and conventional reverberatory furnaces for smelting copper concentrates in such furnaces, for improving the thermal efficiency of the furnace and for achieving an increased concentration of SO.sub.2 in the gas emanating from the furnaces, by the use of specially designed lancing assembly.

Abstract: The gold, silver and selenium content of copper refinery slimes are recovered by first leaching the slimes with dilute sulfuric acid at an elevated temperature and at a partial pressure of oxygen of between about 5 and 50 psig. to obtain a leach solution containing at least about 98% of the copper content of the raw slimes. The decopperized leach residue is dried and then roasted in an oxidizing atmosphere at a temperature of about 400.degree. to 800.degree. C. to obtain effluent roaster gases containing substantially all of the selenium content of the raw slimes in the form of selenium dioxide, the effluent roaster gases being treated to recover the selenium dioxide content thereof. The deselenized roaster residue is mixed with dilute acid and ferric chloride to form a slurry through which chlorine gas and air are continuously bubbled for a period of at least about 5 hrs. to obtain an extraction liquor containing the gold content and a chlorination residue containing the silver content of the raw slimes.