The hydrometallurgy of copper . , it is about $ perton, distributed as follows: Roasterman, 1 shift, roasting one ton, $2. 50 Fuel, 1/2 cord of wood, for one shift, 1. 50 Other expenses, 0 25 $ The cost of roasting silicious ore, low in sulphur, is very much ore can be roasted about as rapidly as it can be worked through thefurnace. In California at one of the mills where oil was substituted for wood,it was found that the capacity of the furnace was increased from 4 tonsto 6 tons per day. The furnace was 14 ft. wide and 75 ft. long. Bakers-field crude oil, of 14 to 16° gravit
The hydrometallurgy of copper . , it is about $ perton, distributed as follows: Roasterman, 1 shift, roasting one ton, $2. 50 Fuel, 1/2 cord of wood, for one shift, 1. 50 Other expenses, 0 25 $ The cost of roasting silicious ore, low in sulphur, is very much ore can be roasted about as rapidly as it can be worked through thefurnace. In California at one of the mills where oil was substituted for wood,it was found that the capacity of the furnace was increased from 4 tonsto 6 tons per day. The furnace was 14 ft. wide and 75 ft. long. Bakers-field crude oil, of 14 to 16° gravity, was used. In roasting 2647 1/4 tonsof pyritic concentrates, 1290 barrels of Bakersfield crude oil was usedwhich cost, delivered, $ or 48/100 barrel per ton of ore, cost-ing 72 cents. There was also used tons of coal to generate steamfor pumping, heating, and atomizing the oil, which cost delivered,, or 35 cents per ton of ore treated; making a total cost of fuel forroasting, of $ or $ per Fig. 12.—Modified long hand reverberatory. Transverse section. Modified Long Reverberatories.—An important modification of thelong reverberatory, especially for copper roasting, is shown in Figs. 10,11,and 12. Fig. 10 shows a longitudinal section; Fig. 11 the plan, andFig. 12 a transverse section through the front of the furnace at the pro-tecting arch and discharge openings in the hearth. One of the difiiculties in hand reverberatories in roasting ore for thehydrometallurgical processes is the liability to fuse the ore near the fire E. C. Vorhies, Scientific and Mining Press, March 26, 1904. 100 HYDROMETALLURGY OF COPPER end, when the fire is urged sufficiently to ignite the charge at the chloridizing roasting a similar difficulty presents itself. In order toeliminate the sulphur sufficiently in hearth section No. 2, by oxidizingroasting, a temperature nearly as high as the ore will stand without fusingis desirable to expedite the process a
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