The hydrometallurgy of copper . CHEMICAL PROCESSES 209 passing backward and forward until it is discharged from the lowest tankqf the series free from copper. Each series consists of three tanks in parallel arranged so that theliquor can be divided and passed along as many tanks as necessary,depending on the quantity of liquor that is being run through and on thevarying temperature of the liquor with different seasons, the hotter thesolution, which in summer reaches 100° F., the faster the rate of precipita-tion. Each tank is about 320 ft. long, ft. wide by ft. deep, andhas a slope v
The hydrometallurgy of copper . CHEMICAL PROCESSES 209 passing backward and forward until it is discharged from the lowest tankqf the series free from copper. Each series consists of three tanks in parallel arranged so that theliquor can be divided and passed along as many tanks as necessary,depending on the quantity of liquor that is being run through and on thevarying temperature of the liquor with different seasons, the hotter thesolution, which in summer reaches 100° F., the faster the rate of precipita-tion. Each tank is about 320 ft. long, ft. wide by ft. deep, andhas a slope varying from 2 per 1000 in the first series to 11 per 1000 inthe last, the reason for the increase in slope being, that as the liquorbecomes impoverished in copper the free acid present is more active inwastefully dissolving the pig iron—an action which is considerably. Fig. 47.—Rio Tinto leaching plant, Spain. General \iew of mineral licaps, copperliquor dam, and precipitating tanks. diminished by increasing the velocity of the liquor by means of the in-creased slope of the tanks. The tanks themselves are made of 9X3 attached to wooden frames set in cement, the space betweenparallel tanks being filled with stone and cement, constituting a the sides of the tanks. Fig. 46 shows the method of removingthe cement copper and Fig. 47 a general view of the mineral heaps,copper liquor dam and precipitating tanks. No metal is used in the tank construction, hard wood pegs being em-ployed to attach the boards to the frames. The spaces between the boards 14 210 HYDROMETALLURGY OF COPPER are carefully caulked with oakum and pitch in order to render the tankwater-tight. At each end of the tank is an arrangement by which a doorcan be dropped in and luted so as to cut out that particular tank, and thereare also wooden plugs that can be re
Size: 1937px × 1289px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400467, bookyear1912
