Thermodynamic estimation of the probability of chemical reactions during alkaline decomposition of eudialyte concentrate

Bogatyreva, E. V.; Khokhlova, O. V.; Муравьева, Е. А.; Dolgov, A. V.

doi:10.17580/tsm.2018.03.07

Cited by 3 publications

(1 citation statement)

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“…The relative ease of extraction of EGMs by magnetic separation [21] and the significant share of heavy rare-earth elements (HREE) makes the exploration of EGM deposits economically feasible [22]. Eudialyte is easily decomposable in acids, but the formation of amorphous silica gel reduces the level of the REE and zirconium extraction into solution [23]. The economic viability has yet to be demonstrated under industry scales, though several promising multi-step leaching techniques were developed [24,25].…”

Section: Introductionmentioning

confidence: 99%

Zr-Rich Eudialyte from the Lovozero Peralkaline Massif, Kola Peninsula, Russia

et al. 2021

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The Lovozero peralkaline massif (Kola Peninsula, Russia) has several deposits of Zr, Nb, Ta and rare earth elements (REE) associated with eudialyte-group minerals (EGM). Eudialyte from the Alluaiv Mt. often forms zonal grains with central parts enriched in Zr (more than 3 apfu) and marginal zones enriched in REEs. The detailed study of the chemical composition (294 microprobe analyses) of EGMs from the drill cores of the Mt. Alluaiv-Mt. Kedykvyrpakhk deposits reveal more than 70% Zr-enriched samples. Single-crystal X-ray diffraction (XRD) was performed separately for the Zr-rich (4.17 Zr apfu) core and the REE-rich (0.54 REE apfu) marginal zone. It was found that extra Zr incorporates into the octahedral M1A site, where it replaces Ca, leading to the symmetry lowering from R3¯m to R32. We demonstrated that the incorporation of extra Zr into EGMs makes the calculation of the eudialyte formula on the basis of Si + Al + Zr + Ti + Hf + Nb + Ta + W = 29 apfu inappropriate.

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