The hydrometallurgy of copper . Smelt. & Ref. Co Kansas aty Smelt. & Ref. Co Min. Ind. Vol. IX, 278. 430 HYDROMETALLURGY OF COPPER The dissolving of the granulated copper with sulphuric acid withouta previous furnace oxidation is accomplished by placing the granules inshort towers (called oxidizers and dissolvers) 3 ft. long, 3 ft. 3 and 6 ft. 6 in. deep, inside dimensions, and lined with lead of 15 square foot. Each tower has an opening 1 ft. square at the bottom and center ofthe front, which serves as an outlet for the liquors and an inlet for air.
The hydrometallurgy of copper . Smelt. & Ref. Co Kansas aty Smelt. & Ref. Co Min. Ind. Vol. IX, 278. 430 HYDROMETALLURGY OF COPPER The dissolving of the granulated copper with sulphuric acid withouta previous furnace oxidation is accomplished by placing the granules inshort towers (called oxidizers and dissolvers) 3 ft. long, 3 ft. 3 and 6 ft. 6 in. deep, inside dimensions, and lined with lead of 15 square foot. Each tower has an opening 1 ft. square at the bottom and center ofthe front, which serves as an outlet for the liquors and an inlet for towers are provided with false bottoms to support the granulatedcopper, made of several iron pipes, each covered with a heavylead pipe with the overlapping ends closed. These pipes are placed sideby side 3 ft. from the bottom, upon chemical bricks set in the towers tothe right and left of the bottom openings. The air space under the falsebottom serves to collect the silver slimes. % Bib SpigotAcid Stoucware. Fig. 76.—Oscillating trough for distribution of acid. The proper condition of the sulphuric acid for the most rapid solutionof the copper is 10° B. strength at 190° F. temperature. The acid isspread over the granulated copper in each tower through a flanged sheetof lead perforated with two quarter-inch holes for each square inch ofsurface. These sheets are placed upon the top of the shot copper andthe spreading of the acid is accomplished by an oscillating trough. Thetrough, 34 in. long, is divided longitudinally by a partition. A, Fig. 76,and the lead pipe and cock, B, convey the acid from a reservoir into thetop compartment, C. When this is full, the trough turns on its axis, F(its center of gravity being changed), until it is stopped by the rod, D,and the acid flows out. As a result of this turning, the second compart-ment, E, is elevated, and when filled in its turn is tilted back to its firstposition, where it is stopped by the rod, G. In this manner t
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