The hydrometallurgy of copper . Ph oo a ROASTING FURNACES 113 make a complete revolution in 4 1/2 minutes, thus stirring the ore seconds. The upper sprocket shaft, at the drive end, is counter-weighted so as to keep the rabble chains taut. The iron work for a 10 X 100 ft. Holthoff-Wethey furnace, with roast-ing and cooling hearths, weighs approximately 130,000 lb. Such afurnace usually has four fire-boxes and a grate area of 60 sq. ft. In the erection of this size furnace there were required: 68,000 common brick,4,000 fire was driven by a 1-5 h. p. r^ ? . jj /I. .nil
The hydrometallurgy of copper . Ph oo a ROASTING FURNACES 113 make a complete revolution in 4 1/2 minutes, thus stirring the ore seconds. The upper sprocket shaft, at the drive end, is counter-weighted so as to keep the rabble chains taut. The iron work for a 10 X 100 ft. Holthoff-Wethey furnace, with roast-ing and cooling hearths, weighs approximately 130,000 lb. Such afurnace usually has four fire-boxes and a grate area of 60 sq. ft. In the erection of this size furnace there were required: 68,000 common brick,4,000 fire was driven by a 1-5 h. p. r^ ? . jj /I. . ^mmMMmmi ^h T^|—1 rT:~rv~r f—r ~ r~f^^.~ i 1-1 -ft i—--^ 2: nrMT ^^rv*« ~|——r Fig. 22.—Holthoff-Welhey furnace. Transverse .section. This size furnace erected at Dalonega, Georgia, roasted concentratescontaining over 15 per cent, sulphur down to or , all but a traceof which was as soluble sulphates. The capacity was 35 to 40 tons perday of 24 hours. The ore contained 10 to 12 per cent, moisture whencharged into the furnace. The fuel used was 12 cords of wood, whichfor 35 tons per day would equal cord per ton. At Colorado Citysix Holthoff-Wethey furnaces, 12 ft. wide and 120 ft. long have been inoperation for many years roasting Cripple Creek ores for chlorination,with a capacity of 100 per furnace per day. The Merton Furnace.—The Merton furnace. Figs. 23 and 24, is arectangular multiple hearth furnace in which the rabbling is done byvertical shafts arranged in a line, and passing throu
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400467, bookyear1912
