. Bulletin. times the volume occupied by the electrodes,or for 24 hours. Clearly a box holding 1 ton, and fitted withelectrodes as described, will handle over 1,000 tons in 24 hours. Asa result of the investigation I was able to increase the precipitationcapacity of the box filled with wire-cloth anodes and cathodes tomore than 200 times that of a similar box with plain electrodes. The effect of the increased capacity was shown still more stronglyin the experiment represented in figure 12. The flow was increasedto 720 liters per hour, and the voltage was increased to 9. The firsttreatme
. Bulletin. times the volume occupied by the electrodes,or for 24 hours. Clearly a box holding 1 ton, and fitted withelectrodes as described, will handle over 1,000 tons in 24 hours. Asa result of the investigation I was able to increase the precipitationcapacity of the box filled with wire-cloth anodes and cathodes tomore than 200 times that of a similar box with plain electrodes. The effect of the increased capacity was shown still more stronglyin the experiment represented in figure 12. The flow was increasedto 720 liters per hour, and the voltage was increased to 9. The firsttreatment was for two hours, when grams of silver was added to 60 ELECTRODEPOSITION OF GOLD AND SILVER. replace the silver in assay The recharging of the solutionwas repeated every hour for the next four hours, and the rapid re-generation of the cyanide is shown clearly by the upper curve. Therapid deposition of the silver is also shown, and the increasedcapacity of the box should also be 4 5 HOURSFigcbe 12.—Electrodeposition results with a rate of flow of 720 liters per hour; volumetreated, 22 liters; velocity of flow, 84 inches per minute through open box, 189 inchesthrough cathodes. If the assay value of the solution be considered as reduced to abouthalf an ounce of silver per ton, the capacity of the box can be figuredat tons per 24 hours for a 1-ton box; if the silver be consideredto be reduced to a little more than an ounce per ton the capacity canbe figured as 2,540 tons per 24 hours in a 1-ton box. USE OF PEROXIDLZED-LEAD ANODES AND WIRE-CLOTH CATHODES. 61 USE OF PEROXIDIZED-LEAD ANODES AND WIRE-CLOTH CATHODES. In the preceding tests an important difficulty was precipitation capacity of the box had been increased so rapidlythat the 30-mesh wire cloth became clogged with precipitated silver,which interfered with the circulation of the solution. The wire- 2221 20,19 18?17 jia 1514 131211109
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