. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. Fig. 1.—Laboratory Cyanide Plant. GENERAL DESCRIPTION. 5 bearing solution * is drawn off from below, and passedthrough the rectangular wooden box below. This boxis divided into six large and six small solution flows down through the small compart-ments and up through the large compartments (forarrangement of box, see Fig. 2). Each large compart-ment is fitted with a wire screen, near the bottom,above which the compartment is filled with zinc
. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. Fig. 1.—Laboratory Cyanide Plant. GENERAL DESCRIPTION. 5 bearing solution * is drawn off from below, and passedthrough the rectangular wooden box below. This boxis divided into six large and six small solution flows down through the small compart-ments and up through the large compartments (forarrangement of box, see Fig. 2). Each large compart-ment is fitted with a wire screen, near the bottom,above which the compartment is filled with zinc shav-. Pig. 2.—Wooden Zinc-boxes. ings. The zinc precipitates the gold and silver fromthe solution, and the solution runs down into thelowest, or sump tank. From this tank the solution ispoured back (pumped back in large works, see Fig. 5)into the uppermost tank, enough strong solution isadded to bring the used solution to the strength it hadbefore it was put on the ore, the ore in the next lowertank is replaced by fresh ore, and all the other operationsare repeated as before. * Generally, the first solution of potassium cyanide is followedby a weaker solution, or a weak solution is used first, followed bya stronger solution; and the last potassium cyanide solution isfollowed by a water-wash. THE CYANIDE PROCESS.
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