File:Transactions (1871) (14597290819).jpg

Identifier: transactionsmining60amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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each busbar is a triangular piece of copper, 19 in. high, giving apoint contact to the electrode bars. Small maple blocks impregnatedwith linseed oil insulate cathodes and anodes from opposite busbars.These busbars are supported on insulated iron castings, which in turnrest on the tank cleats. The current for the deposition of the copper issupplied to the tank house by two identical 15,000-amp. circuits, eachcircuit having 76 tanks in series. This arrangement gives the maximumcurrent density of 8 amp. per sq. ft. of cathode surface when operatingunder normal conditions. With an average current efficiency of 80 percent, this means a daily gain of about 10.25 lb. (4.6 kg.) per cathode,or a total capacity of 120,000 lb. of electrolytic copper per day. Thedrop of potential between anodes and cathodes has averaged very closeto 2.00 volts. There is a tendency for the voltage to drop during thesummer due to increase in temperature of the electrolyte. HENRY A. TOBELMANN AND JAMES A. POTTER 55
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56 FIRST YEAR OF LEACHING BY THE NEW CORNELIA COPPER CO. Electrolyte The solution flow in the tank house is part of a closed circuit with theleaching and reduction plant, receiving a continuous flow of solutionfrom them. This flow, coming always off the newest ore, then throughthe towers and settler, is regulated by means of weirs and has variedfrom 800 to 1500 gal. (3028 to 5677 1.) per min., depending on operatingconditions. This volume is divided among the 16 banks of tanks, thoseon starting sheets getting generally a little more than those on cathodes.By this arrangement each bank of tanks on cathodes receives between60 and 70 gal. per min. of reduced solution. Each bank unit consists ofeither 8 or 10 tanks, a sump, and a 9-in. (22.8-cm.) vertical type centrif-ugal pump of 1600 gal. per min. capacity. Each bank has an individualcirculation of 1600 gal. per min. between it and the sump, while an over-flow arrangement provides for the return of such a portion of the electro-lyte as

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