Experiments on the element distribution between ilmenite and aqueous chloride solution under supercritical conditions.

Experimental investigation of the simultaneous partitioning of divalent cations between löllingite or safflorite and 2 mol/L aqueous chloride solutions under supercritical conditions

“…The partition coefficient versus ionic radius (PC-IR) curves (Matsui et al, 1977) for pyrite, pyrrhotite, arsenopyrite, and cobaltite show the similar tendency. In particular, Ni 2+ shows a positive partition anomaly and Zn 2+ shows a negative partition anomaly, which is the same as that reported for multiple oxide minerals such as ilmenite (Uchida et al, 2000) and magnetite (Uchida et al, 2004b). However, the widths of the PC-IR curves drawn from the partitioning of Mg 2+ , Co 2+ , Fe 2+ , and Mn 2+ differ substantially.…”

“…6). Although the width of the PC-IR curves is different, similar results are observed for multiple oxide minerals such as ilmenite (Uchida et al, 2000) and magnetite (Uchida et al, 2004b) (Fig. 6).…”

“…m Me aq is the total molar concentration of Me-bearing aqueous species. Judging from previous studies (Uchida et al, 2000), it is inferred under the present experimental conditions that neutral aqueous species such as FeCl 2 0 and CoCl 2 0 are dominant. Therefore, it is considered that partition coefficients obtained from the bulk composition and from the neutral dissolved species coincide with each other.…”

“…Zn 2+ shows a clear negative partition anomaly because Zn 2+ does not have a preference for non-4-fold coordinated sites (Matsui et al, 1977). On (Uchida et al, 2000(Uchida et al, , 2004b(Uchida et al, , 2017(Uchida et al, , 2019 at 600°C and 100 MPa.…”