Abstract
Experimental testwork has shown that arsenic can be removed from arsenic-bearing solutions by hydrothermal precipitation at temperatures in the 170–200°C range. The presence of Fe(III) is required for combination with As(V) to form the crystalline hydrated ferric arsenate known as scorodite (FeAsO4·2H2O). The contained arsenic is effectively immobilized by incorporation into a crystalline, low-solubility compound. Process options are suggested for disposing of arsenic in copper electrorefinery bleed liquors.
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