. Transactions. 0 40 50 60 50 80 50 100 60 0 60 20 60 40 60 60 60 80 60 100 70 0 70 20 70 40 70 60 70 80
. Transactions. 0 40 50 60 50 80 50 100 60 0 60 20 60 40 60 60 60 80 60 100 70 0 70 20 70 40 70 60 70 80 70 100 C. A. HANSEN Power Requirements of the Zinc Cell 221 Fig. 12 represents a summary of products of voltage and currentefficiencies. Power is stated in terms of kilowatt-hours (direct current)required to deposit 2000 lb. of cathode zinc. On melting the cathodes, the yield of ingot zinc averages 94 to 95per cent, of the cathode weights .3000Q .40 60 80 100 Grama H 2 SO 4 per Liter Fig. 12. For converting alternating current (high-voltage) to direct current,the efficiencies of modern converting equipment may be taken at 92per cent, for transformers and rotary converters, and 87 per cent, fortransformers and motor-generators. The direct-current data should, therefore, be multiplied by ,or by , depending upon the choice of conversion apparatus, tocompute the alternating-current requirements of the cell-room, per tonof ingot spelter, for the electrolysis of commercially pure zinc-sulfatesolutions. For the present, these data are offered without comment as to their 222 ^^ELECTROLYTIC ZINC economic bearing. It may, however, be stated here that the only heatused in the leaching plant is that due to the solution of zinc oxide in theregenerated acid. High-acid concentrations bring about high leaching-tank temperatures; high leaching-tank temperatures conduce to ex-cellent coagulation of the colloida
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
