Abstract
Mylonite rocks of the Abu Rusheid area, Southeastern Desert of Egypt, were physically upgraded producing Zr, Ti, Nb, and REEs concentrate. Comparative fusion digestion studies of the concentrate using NaOH and KOH were carried out. Dissolution efficiencies of 83.4%, 99.8%, 69.7%, and 97.1% for Zr, Nb, Ti, and REEs, respectively, were accomplished using NaOH under 1023 K, 90 min, 1:1.25 ratio, and 74 µm particle size. However, 79.5, 87.3, 90.5, and 97.4% were achieved using KOH under 1023 K, 90 min, 1:1.75 ratio, and 44 µm particle size. Suggested pseudo-reversible first-order, uptake general, and shrinking core models fitted well with the experimental results using the two alkalis. Convergent activation energies were calculated using the three models. A suggested Floatotherm including the Van’t Hoff parameters model showed endothermic and spontaneous behavior with a decrease in the randomness at the solid/solution interface during the attack of fused alkali on the concentrate particles.
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Eliwa, A.A., Gawad, E.A., Mubark, A.E. et al. Intensive Studies for Modeling and Thermodynamics of Fusion Digestion Processes of Abu Rusheid Mylonite Rocks. JOM 73, 3419–3429 (2021). https://doi.org/10.1007/s11837-021-04837-1
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DOI: https://doi.org/10.1007/s11837-021-04837-1