. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. calculated upon, wouldprobably in practice reach 20,000 tons a year. Each indicated horse-power would require, say22 lb. of water to be evaporated an hour, or for 2395 horse-power 52,690 lb. of water an square foot of bolier-heating surface would not evaporate more than 5 lb. of water an hom^,therefore 10,538 square feet of heating surface would be required, and this should be contained in,say, 20 boilers of ordinary size. Figs. 957 to 959 are of an arrangement of plant for treating 300,000 tons
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. calculated upon, wouldprobably in practice reach 20,000 tons a year. Each indicated horse-power would require, say22 lb. of water to be evaporated an hour, or for 2395 horse-power 52,690 lb. of water an square foot of bolier-heating surface would not evaporate more than 5 lb. of water an hom^,therefore 10,538 square feet of heating surface would be required, and this should be contained in,say, 20 boilers of ordinary size. Figs. 957 to 959 are of an arrangement of plant for treating 300,000 tons of cupreous pyrites by 432 COPPEB. Holloways process. Fig. 957 is of a conyerter for treating cupreous pyrites by this process. Fig. 960is a section on the line A B, Fig. 958. Fig. 959 is an extended section on the line CD. a a arethe depositing pits, 6 the furnace, c the bunkers, d the sulphur-collecting chambers, e the blowingcupolas, / siding and tramway for empty ladles, g hot-blast stoves, h sulphur-depositing chambers,i reverberatory furnace heated by gas, j the hot-blast It is estimated that by this process 300,000 tons of pyrites, containing not less than IJ per cent,copper, 1 oz. 11 dwts. 8 grs. silver, and 3 grs. gold a ton of pyrites, should produce 15,000 tons ofregulus, containing 30 per cent, copper, 15 oz. 13 dwts. 8 grs. silver, and 1 dwt. 6 grs. gold, a ton ofregulus; but the quantity is somewhat less, because there is a small loss of copper in the slag,which, however, should not exceed 10 per cent, of the total copper. 300,000 tons of pyrites would also produce 72,000 tons of crude sulphur, and there would beexpended on 310,000 tons of pyrites 18 tons of coals for every 100 tons of pyrites. If ordinary sand or siliceous rock is employed, 1 ton will be required to every 3 tons of these calculations, however, an extreme case is preferred, that the silica might be taken fromthe linings of the vessel, and therefore a larger quantity must be calcu
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
