Notes On Gold Extraction By Means of Cyanide of Potassium Macarthur Forrest Pat
Notes On Gold Extraction By Means of Cyanide of Potassium Macarthur Forrest Pat
W R Feldtmann
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This is done by separating from the zinc, drying, roasting, and smelting. The "cleaning-up, " which takes place once or twice a month, is conducted as follows : A sufficient amount of clean water is run through the boxes to remove the cyanide solution, which might otherwise be injurious to the workmen. The zinc shavings are taken out, being twisted and rubbed in the water to remove, as much as possible, all gold adhering to them. In some cases there is quite a thick gold plating on the zinc, wh...ich cannot well be removed by scrubbing, but as all the shavings are returned to the boxes anyway, and this plating of one month will go to form the precipitate of the next, it may be ignored. Having removed nearly all the coarse zinc, the precipitate contained in the water is allowed to settle the addition of a little alum will considerably expedite the settling. The bulk of the clear water is then syphoned or\pumped off, and the precipitate, most of which is under the trays, together with the remaining small quantity of water, is drawn off through the plug-holes into a calico or linen filter, or into a filter press.
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