Kinetics of interphase transfer of zirconium between nitric acid and tributyl phosphate solutions

Pandey, N. K.; Murali, Remya; Augustine, Elizabeth; Ganesh, S.; Joshi, Jyeshtharaj B.

doi:10.1007/s10967-017-5625-z

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…Based on Safari et al [16] the longer the contact time will affect the mass displacement of the solid particles into the acid solvent. The optimization results of 2 min contact time turned out to be in accordance with Pandey's et al [13].…”

Section: Effect Of Contact Timesupporting

confidence: 85%

“…Nitric acid is a strong acid that can be easily deprotonated. Hence hydrogen can be transferred to metal complexes, and according to Pandey et al [13], the dissolution chemical reaction between ZOC and HNO3 could produce ZrO(NO3)2,…”

Section: Effect Of Contact Timementioning

confidence: 99%

“…Based on Pandey et al [13], in a solution of HNO3 zirconium ions will form some speciation equilibrium such as Zr 4+ , ZrOH 3+ , and Zr3(OH)4 8+ . Each of these zirconium ion species has different equilibrium strength in the HNO3 atmosphere.…”

Section: Effect Of Hno3 Concentrationmentioning

confidence: 99%

“…Based on Pandey et al [7] and Murali et al [11], the success of Zr purification from HF with solvent extraction was determined by the acidity of the feed in its liquid phase. Pandey et al [13] have investigated that the TBP extractant was the best for separating Zr from HF, with the nitric acid system. This matter is due to the mass transfer of Zr 4+ into the organic phase will be influenced by the presence of several species such as ZrOH 3+ and Zr3(OH)8 +4 in the nitric acid condition [13].…”

Section: ■ Introductionmentioning

confidence: 99%

“…Pandey et al [13] have investigated that the TBP extractant was the best for separating Zr from HF, with the nitric acid system. This matter is due to the mass transfer of Zr 4+ into the organic phase will be influenced by the presence of several species such as ZrOH 3+ and Zr3(OH)8 +4 in the nitric acid condition [13]. Through the idea of making a ZOC dissolution reactor design, then the purpose of this study to optimize and kinetics of ZOC dissolution with HNO3 would be materialized.…”

Section: ■ Introductionmentioning

confidence: 99%

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Optimization and Kinetics of Zirconium Oxychloride (ZOC) Dissolution Using HNO<sub>3</sub>

Purwani¹,

Muzakky²

2019

Indones. J. Chem.

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The design of chemical reactor can not be separated from the optimization data and reaction kinetics obtained from the experimental measurement. Through the idea of making the dissolution reactor design, the purpose of this research is to obtain optimization data and dissolution kinetics of Zirconium Oxide Chloride (ZOC) using HNO3. The design of the solvent reactor is required to make the feedstock in the liquid-liquid extraction process continuously. The extraction process is a mini-pilot plant unit as a nuclear-grade zirconia manufacture. The dissolution optimization was carried out by dissolving ZOC solids of zircon sand processed products using HNO3 in a container with some variation of contact time, HNO3 concentration and temperature. While the kinetics data was gained by extracting from the optimization data obtained based on the formula of reaction orders. The investigation result with 6 gr of ZOC and 6M HNO3 concentration obtained the best contact optimum time of 2 minutes and the conversion number (α) of 0.96. The dissolution reaction mechanism was estimated in accordance with the reaction of order 1 with the k value of 1.5879 minutes-1. It was predicted that the reaction mechanism of ZOC dissolution in HNO3 begins with diffuse control and is followed by chemical reaction control. With increasing conversion temperature, the conversion will increase to 0.98, while the reaction also follows the reaction order 1. The optimum temperature at 60 °C, and the correlation between temperature (T) with the calculated reaction rate constant (k) according to the Arrhenius formula yielded an equation of ln k = - 4191,6 / T + 13,903 or k = 13,903.e- 4191,6 / T, with the frequency factor A = 1091430 and the activation energy E = 34,848 kJ / mole.

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Section: Effect Of Contact Timesupporting

confidence: 85%

Section: Effect Of Contact Timementioning

confidence: 99%

Section: Effect Of Hno3 Concentrationmentioning

confidence: 99%