. Bulletin. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17HOURSFigure 2.—Curves from experiments on electrodeposition of gold from solution ofcyanide of potassium. Iron anode, 12| by 13 cm.; lead cathode, 12J by 13 cm.;current, 2 volts from storage cell; KCy, per cent; Au, per cent; volumeof solution, 500 c. c.; Au, $3 a ton ; electrodes \\ cm. apart. Following these tests and in the same apparatus a cyanide solu-tion was treated containing per cent of free cyanide and $3 a. 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 HOURS Figure 3.—Curves from experiments on
. Bulletin. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17HOURSFigure 2.—Curves from experiments on electrodeposition of gold from solution ofcyanide of potassium. Iron anode, 12| by 13 cm.; lead cathode, 12J by 13 cm.;current, 2 volts from storage cell; KCy, per cent; Au, per cent; volumeof solution, 500 c. c.; Au, $3 a ton ; electrodes \\ cm. apart. Following these tests and in the same apparatus a cyanide solu-tion was treated containing per cent of free cyanide and $3 a. 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 HOURS Figure 3.—Curves from experiments on electrodeposition of gold from solution ofcyanide of potassium. Iron anode, 12* by 13 cm.; lead cathode, 12J by 13 cm.; elec-trodes 1\ cm. apart; current, 2 volts from storage cell; volume of solution, 500 c. c.;An, Sly a ton; KCy, per cent. ton in gold. The results of the experiment showed that in 17 hoursonly 88 per cent of the gold was precipitated. The cyanide was con- STUDY OF CONDITIONS GOVERNING ELECTROLYTIC DEPOSITION. 41 tinuously destroyed, only per cent remaining at the end of theexperiment. The results of this test are shown in figure 2. In the same apparatus a per cent cyanide solution containing$15 a ton in gold was treated. One storage cell was used and theexperiment lasted for 40 hours. The results are shown in figure 3. At the end of 24 hours the gold was reduced from $15 to $ ton. One-half the cyanide then had been destroyed. At thistime I added s
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