. Mining and Scientific Press . finally confined: our tests to the Cottrell process, which later was recom-mended to the Pope-Shenon company for its plant nearSalmon. The question of the reduction of the dry chloride fume to metal was early before us. The result* of reducing chloride tO metal by fusing with lime and coke had not been encouraging, although we had continued thechemistry of the reaction involved and had tried the oper-ation on a small Now. with the larger quantities of nearly pure chlorides of copper we found the verifica-tion of tlie theory easy. The Oral fusion test perf
. Mining and Scientific Press . finally confined: our tests to the Cottrell process, which later was recom-mended to the Pope-Shenon company for its plant nearSalmon. The question of the reduction of the dry chloride fume to metal was early before us. The result* of reducing chloride tO metal by fusing with lime and coke had not been encouraging, although we had continued thechemistry of the reaction involved and had tried the oper-ation on a small Now. with the larger quantities of nearly pure chlorides of copper we found the verifica-tion of tlie theory easy. The Oral fusion test performedon 20(1 grammes of Cottrell fume, containing 11, cop-per, gave a fluid pour and we anxiously awaited thecooling of the mold in order to satisfy ourselves thatthe copper was at the bottom Our hopes were morethan realized when we took from the bottom of the molda clean bar of copper weighing 78 gm, or ov< t 90% ofthe weigh! of the copper in the fume. The metal from this fusion contained small amounts Of sulphur and iron,. FURNACE FOR VOL \;N but was about 95$ pure, other Fusion tests made withmore carefully calculated charges gave higher extractionsand better grades of coppi r. The fusion with lime andcoke was checked thoroughly, and this method of reduc-tion was recommended for the pioneer plant at the Pope-Shenon mine. The slag was found to be principally calcium chloridecarrying about $% copper along with the silica andother impurities in the fume. Slag, analyzing 50%chlorine, was found to act vigorously in chloridizing thecopper in a new lot of ore. This slag was even moreactive than raw calcium chloride, for the moisture, whichmakes up 25fc or more of the raw material, was absentfrom the slag. It was recommended therefore that thecompany provide for the re-use of the fusion-furnace slagas a cbloridiz il in the volatilization furnace. The one feature that we could not determine definitelybv laboratory tests was the kind and size of furnace re-quired for th
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