Abstract
ABSTRACT A laboratory investigation was undertaken on the silver-thiourea system for the recovery of silver by ion flotation. An anionic surfactant, sodium dodecylben- zenesulfonate, reacted readily with the silver—thiourea complex cation to form a colloidal precipitate (sublate), and the sublate was then floated by tiny bubbles. The influences of several factors on the flotation efficiency were studied. The recovery rate reached 96% under optimum conditions. Pure metallic silver was easily obtained from the floated sublate by thermal decomposition at 900°C. The proposed process is fast, simple, and economical, and it may be useful for both laboratory and industrial recovery of silver.
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