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advantage amount antimony apparatus arch arsenic assay average blast blast-furnace blister copper bottom brick-work burning Butte City calcination capacity cent chalcopyrite charge charging-door chilling chimney clay coal coke condition considerable construction containing cooling cost crucible crushing cupola draught effect entire expense experience feet fire fire-box fire-brick flue flux fore-hearth fuel fusible fusion gangue grade heap roasting hearth heat inches increase iron iron pyrites jacket labor Lake Superior latter layer lower material matte metallic copper metallurgical metallurgist method mineral mines molds molten nace necessary obtained operation ordinary oxidation pig-copper plate portion potassium bitartrate pounds practice present produced proper proportion pulverized pyrites quantity quartz rapid reduced refining removed repairs reverberatory furnace roast-heap sample sand side siliceous slag smelter smelting stack stalls substances sufficient sulphate sulphide sulphuric acid surface Swansea tap-hole tapping temperature tion tons tuyere openings upper usually walls water-jacket weight zinc
Page 17 - Six months' constant experience with this sampler has shown that 10 per cent, of 20 per cent., or 2 per cent, of the original...
Page 18 - ... though in exceptional cases, 15 per cent, of 30 per cent., or 4^ per cent, of the ore may be required.
Page 347 - ASSAY FURNACES. Awarded the Highest and only MEDAL at World's Fair for Hydrocarbon Blowpipes and Assay Furnaces. No Dust. No Ashes. Cheap, Effective, Economical, Portable, and Automatic. SEND FOR CIRCULAR AND PRICE IJ8T TO W, HOSKINS, 81 South Clark St., Room 55, CHICAGO, ILL Incorporated 18G8.
Page 137 - ... to the first 16 ft. ; an increase to 15 per cent will be sufficient, however, to heat a second hearth, while a 20 per cent sulphur-ore will work rapidly in a three-hearth furnace. The addition of a fourth hearth is rendered justifiable by the increase of the average sulphur contents to 25 per cent. As there seems to be almost no limit to the extent of surface over which the requisite temperature may be obtained in the calcination of highly sulphureted ores, much longer furnaces have been used,...
Page 277 - For smelting ore the cupola is specially advantageous — " 1. With highly ferruginous ores. " 2. Where the cost of anthracite, coke, or charcoal is not excessively greater than that of bituminous coal, wood, and other fuels fitted for the reverberatory only. " 3. For oxidised ores. " 4. For low-grade native copper. " •>. Where, as in the case of lean ores, clean slags are a necessity.