Dispersion of antimony from oxidizing ore deposits

Abstract

, at 25 °C in 0.100 mol dm -3 aqueous HNO 3 was also investigated. Equilibrium dissolved Sb concentrations were 3.3 ± 1.0 × 10 -7 and 7.7 ± 2.1 × 10 -8 mol dm -3 , respectively. These values have been used to re-evaluate the geochemical mobility of Sb in the supergene environment. It is concluded that the element is geochemically immobile in solution and in soils. This was in part validated by an orientation soil geochemical survey over the Bayley Park prospect near Armidale, New South Wales, Australia. Anomalous soil Sb levels are confined to within 100 m of known stibnite mineralization.

Antimony retention and release from drained and waterlogged shooting range soil under field conditions

“…Independent of the mechanisms behind the observed correlations, our findings are in contrast to previous studies concluding that Sb solubility was governed by Ca antimonate solubility in calcareous soils (Johnson et al, 2005;Oorts et al, 2008;Diemar et al, 2009;Okkenhaug et al, 2011), as this should have resulted in a negative correlation between Sb and Ca concentrations (Cornelis et al, 2011;Okkenhaug et al, 2012). Solubility calculations performed with log 10 K = À12.5 as equilibrium constant (Cornelis et al, 2011) confirmed that the soil water was indeed undersaturated with respect to Ca antimonate.…”

Distribution, speciation and availability of antimony (Sb) in soils and terrestrial plants from an active Sb mining area

“…This fact highlights the operational function of the sequential extraction. Previous studies of soils from abandoned mining areas have shown low levels of soluble Sb in soil (Baroni et al, 2000;Casado et al, 2007;Flynn et al, 2003;Gal et al, 2007;Hammel et al, 2000), indicating that Sb is geochemically immobile (Ainsworth et al, 1990a, b;Diemar et al, 2009;Flynn et al, 2003). The present results show that the mobility of Sb may be substantial higher in active mining areas like Xikuangshan, indicating a high level of bioavailable Sb in soil.…”

Antimony in the environment: knowns and unknowns

“…Diemar et al [32] [32] Nevertheless, it is possible that the above data may represent the approximate upper limits of the solubility of Sb V in the presence of Ca 2+ (aq) and Pb 2+ (aq) with short reaction times. With this in mind, it is noteworthy that Vitaliano and Mason [40] found that many of the natural specimens of stibiconite that they studied were X-ray-amorphous or poorly crystalline, and many contained appreciable amounts of calcium.…”

“…Some solubility data are available for roméite and bindheimite. [32] These minerals do not dissolve congruently in acid solution.…”

“…[23,[25][26][27][28][29][30][31][32][33][34][35][36] Reliable thermochemical data are available for stibnite, [25,26] but the accuracy and precision of data derived from Williams-Jones and Normand [23] and Babčan [27] for kermesite remain questionable. Fortunately, deficiencies associated with reliable thermochemical data for most of the common antimony oxides have been eliminated in the light of more recent experimental studies.…”