Elsevier

Hydrometallurgy

Volume 22, Issue 3, August 1989, Pages 311-337
Hydrometallurgy

Solubilities and stabilities of ferric arsenate compounds

https://doi.org/10.1016/0304-386X(89)90028-5Get rights and content

Abstract

Basic ferric arsenates precipitated from hydrometallurgical liquors by hydrolysis are shown to be very insoluble over a range of pHs. The stability range (solubilities <1 mg l−1) becomes wider with increasing Fe/As ratios. Precipitates with Fe/As ratio=8 have solubilities <1 mg l−1 between Ph=3 and 8. The As solubility did not increase during aging over a 2–3.7 yr period. Naturally occurring iron oxide samples with Fe/As ratios=3–4 show even lower As solubilities than precipitates with the same Ar/As ratios. The solubility of crystalline scorodite, FeAsO42H2O, was found to be about two orders of magnitude lower than reported in the literature for apparently amorphous FeAsO4H2O. The solubility and the free energy of formation were recalculated for crystalline scorodite. This investigation shows that basic ferric arsenates appear to be suitable for safe disposal of arsenic.

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