. Bulletin. er,the precipitation from the richsolution, notwithstanding theseirregularities, was found to bevery satisfactory. In four hours the precipitationwas per cent, the capacitybeing at the rate of 36 tons fora 1-ton box in 21 hours. For athree-hour period the precipita-tion was per cent, the ca-pacity being at the rate of 48tons per day for a 1-ton box. The solution employed wasprobably as rich as would everhave to be precipitated in prac-tice. Each of the six electrodeboxes held grams of excel-sior charcoal, or 28 grams in ash from this charcoal, in-cluding th
. Bulletin. er,the precipitation from the richsolution, notwithstanding theseirregularities, was found to bevery satisfactory. In four hours the precipitationwas per cent, the capacitybeing at the rate of 36 tons fora 1-ton box in 21 hours. For athree-hour period the precipita-tion was per cent, the ca-pacity being at the rate of 48tons per day for a 1-ton box. The solution employed wasprobably as rich as would everhave to be precipitated in prac-tice. Each of the six electrodeboxes held grams of excel-sior charcoal, or 28 grams in ash from this charcoal, in-cluding the silver, the lime, etc.,weighed grams. After thesoluble salts were removed withdilute hydrochloric acid the resi-due—silver and insoluble silica—weighed grams as grams of silver containedin the original solution. Hencethere was soluble in hydrochloricacid grains of substance, in-cluding the hydrates and carbonates of lime and potassa and thesoluble constituents of the *.« mg.*> - | 1,1JHIK>» 24 =li4 tons in 1-ton recovered, first hour grams \ i ig., ou ices per to i V mg|) Q9 Ij1&) pjpia pi mce o 3 HOURS Figure 39.—Electrodeposition results withrich silver solution, using J-inch currentgaps. One Acheson-graphito anode, 10compound pervious charcoal electrodes,9£ inches long; cross section, 1 squaredecimeter; 1 simple pervious charcoalcathode. Eleven current gaps, at 3Jvolts, or 38J volts in all. Solution, 20liters, contained 20 grams KCy, 20 gramsKIIO, grams Ag as KAgCy2, and nolime. Electrodes choked with silver;grade increaesd from 3 inch to 1J inchesper foot; rate of flow cut from to per minute (210 to 150 per hour) ;velocity, to inches per increase in capacity compared withfig. 38. DESCRIPTION OF AN EXPERIMENTAL PLANT. 157 ^I /* (^ so < f ~^ I / \ / \ 19 ii ) of BOlu u\ 0. 85. ^ / \ / \ lfl I1 _i c 1 18 / \ 1 ft \ / \ 1.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
