Kinetics of Scheelite Conversion in Sulfuric Acid
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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6
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JOM, pp. 2499-2504
Abstract
Complete conversion of scheelite in H2SO4 solution plays a key role in exploration of cleaner technology for producing ammonium paratungstate. In this work, the factors influencing scheelite conversion were investigated experimentally to model its kinetics. The results indicated that the conversion rate increases with increasing temperature and reducing particle size, but is almost independent of stirring speed. Moreover, although the conversion rate increases with increasing initial H2SO4 concentration (≤ 1.25 mol/L), it decreases rapidly at 1.5 mol/L H2SO4 after 10 min due to formation of a H2WO4 layer. The experimental data agree quite well with the shrinking core model under chemical reaction control in ≤ 1.25 mol/L H2SO4 solution, and the kinetic equation was established as: (Formula presented.) (t, min). This work could contribute to better understanding of scheelite conversion in H2SO4 solution and development of a new route for ammonium paratungstate production.Description
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Shen, L, Li, X, Zhou, Q, Peng, Z, Liu, G, Qi, T & Taskinen, P 2018, 'Kinetics of Scheelite Conversion in Sulfuric Acid', JOM, pp. 2499-2504. https://doi.org/10.1007/s11837-018-2787-2