Electrochemical and metallurgical industry . n the same manner as the cyanideis added, e. g., by placing in some receptacle and allowing thepumped solution to flow over the alkali whereby the alkali isdissolved and added to-the storage solution. The electrodes are preferably lead, as slight action occurs,although a set of lead electrodes will last but little more thanhalf a year. They then become honeycombed and lose themetallic property of lead to some extent. The distance of theelectrodes apart, is, with wooden tanks, the diameter of thetank, the object being to get equal distribution of the
Electrochemical and metallurgical industry . n the same manner as the cyanideis added, e. g., by placing in some receptacle and allowing thepumped solution to flow over the alkali whereby the alkali isdissolved and added to-the storage solution. The electrodes are preferably lead, as slight action occurs,although a set of lead electrodes will last but little more thanhalf a year. They then become honeycombed and lose themetallic property of lead to some extent. The distance of theelectrodes apart, is, with wooden tanks, the diameter of thetank, the object being to get equal distribution of the currentthroughout the whole solution mass. Therefore the electrodesshould be as long as the tank is high, and from 6 inches to ifoot wide. A suitable transformer giving a potential sufficient to pro-duce a current from .05 to .10 amperes per ton of solution con-tained in the storage tank should be used. The he 60 periods per second, and there should be no ebul-lition of gas at either electrode. To deliver the energy to the. 2(k) ELECTKOCIIKMK AL AN D M 1£ TALLURCUCAL INl)lSI RV. [Vol. 111. No. 7. solution, cart- should he taken that no pipe or other metallicconductor prevent this. The current sliould be maintained con-tinuously and free alkali present, no mixture of alkalies used. Ihis process was applied, as described, to the cyanide plantof the SniuKjjler-lnion MiniuK Co., (Fig. 2) about May 15,igoj. some four and one-half months after that plant was putinto conunission. This plant used, when in full operation, atotal of some 2000 tons of solutions. Therefore some timeelapsed before the solution had made its circuit and becometreated. When tliis was done a marked difference in the KCyconsumption was realized. Previous to this some 400 to 500pounds of cyanide was necessary each tlay to maintain thestandard strength of the solution. After the j)rocess was infull operation for two or three days, and the maximum effectreached, no cyanide was needed, then a few
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