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- W4239112156 abstract "The ability of silica sol to neutralize and adsorb copper and cobalt from dilute, acidic solutions has been studied on a laboratory scale. At the pH for maximum adsorption (pH 7.0 for Cu and 8.3 for Co), more than 1 ppm metal remains dissolved which rises to about 30 ppm if pH is further increased. This effect is attributed to desorbed colloidal species at high pH. Final pH control with lime gave less than 1 ppm Cu or Co. The replacement of lime with sol reduces the formation of waste hydroxide/gypsum sludge.The adsorption of metal ions coagulates the sol and produces a sharply defined underflow and clear overflow. Adsorbed metal was recovered into a concentrated solution (relative to the feed) by reversing the adsorption reaction through acidification of centrifuged underflow. With feeds containing from 58 ppm to 2.83 g/L metal, product solutions from 339 ppm to 17.5 g/L metal were generated, although at 17.5 g/L a viscous suspension of agglomerates was produced. Use of recycled silica was demonstrated." @default.
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- W4239112156 date "2003-03-01" @default.
- W4239112156 modified "2023-09-26" @default.
- W4239112156 title "Dissolved Copper and Cobalt Recovery From Dilute Acidic Solutions by Adsorption on Silica Sol" @default.
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- W4239112156 doi "https://doi.org/10.1179/000844303794535807" @default.
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