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gold extraction from colloidal gold

Theextractis transferred to tanks, and thegoldprecipitated as a powder by addition of zinc. It is then washed out from the bottom of the tanks, dried, and freed from zinc by roasting and fusing. In the electrolytic precipitation of thegoldan iron anode and a sheet-lead cathode are employed, the current-density being very low, about 0.5 amp. per sq. metre.

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