Kinetics of nickel extraction from Indonesian saprolitic ore by citric acid leaching under atmospheric pressure

Astuti, Widi; Hirajima, Tsuyoshi; Sasaki, Keiko; Okibe, Naoko

doi:10.1007/bf03402286

Cited by 16 publications

(12 citation statements)

References 13 publications

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“… 28 The results showed that shrinking core model with diffusion through ash layer controlling process was the most suitable model. 29 Similar conclusion was also reported by other researchers. 30 As a result, the ash diffusion model better explains the mechanism of Ru cementation over the Al powder than the rest of models.…”

Section: Resultssupporting

confidence: 85%

Highly efficient recovery of ruthenium from integrated circuit (IC) manufacturing wastewater by Al reduction and cementation

Shih

et al. 2019

RSC Adv.

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Section: Resultssupporting

confidence: 85%

Highly efficient recovery of ruthenium from integrated circuit (IC) manufacturing wastewater by Al reduction and cementation

Shih

et al. 2019

RSC Adv.

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“…Therefore, one can assume that, regardless of bioleaching conditions, chemical reaction was the rate-determining step. The results for citric acid are partially similar to the kinetic mechanisms of citric acid leaching of Indonesian saprolitic ores [30] and leaching of celestite with nitric acid [32], where solid product layer was also the governing step of the reaction.…”

Section: Bioleaching Efficiency and Kineticssupporting

confidence: 60%

“…The inevitable part of a process optimization is a kinetic analysis of metal extraction. Every (bio)hydrometallurgical treatment of a solid sample may be considered as heterogenous solid-liquid interaction [30][31][32]. Therefore, the process going on within the system can be described as A (liquid) + B (solid) → products.…”

Section: Introductionmentioning

confidence: 99%

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Vanadium removal from spent sulfuric acid plant catalyst using citric acid and Acidithiobacillus thiooxidans

Mikoda

Potysz

Kucha

et al. 2020

Archiv.Civ.Mech.Eng

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Spent catalysts being considered hazardous wastes exhibit a high metal content in mobile forms. In addition, growing demand for circular economy policy applications requires proper utilization of these wastes. This study aimed at the assessment of vanadium leaching from spent desulfurization catalyst derived from sulfuric acid plant dump located nearby a copper smelter. Chemical and phase composition of the catalyst has been characterized. The extraction has been performed using chemical (0.1-M and 1-M citric acid) and biological (biotic solution with Acidithiobacillus thiooxidans) methods, using different experimental parameters (pulp density, particle size, leaching time) to observe V leaching behavior and kinetics. The results revealed that both citric acid and bacteria carried out the extraction process well. The optimal parameters for acid leaching were < 0.2-mm particle size and 2% pulp density, which allowed to leach out 95% of V from spent catalyst within 48 h. The bacterially mediated extraction resulted in 93% V leached out within 21 days with 2% pulp density. The experiments showed that V present in the catalyst is susceptible to bioleaching and organic acid leaching with the latter being a quicker process.

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“…Leaching kinetics rate of a metal-bearing mineral in the presence of a solution is mainly demonstrated by the shrinking core model (SCM) (Eq.1). It has been proven that the SCM model represents a realistic estimation of kinetic reactions in comparison with other models (Levenspiel, 1999;Astuti et al, 2015;Safari et al, 2009;Erdem and Yurten, 2015). Thus, the SCM kinetic modeling concept was employed for identifying the kinetic mechanism of the copper leaching process.…”

Section: Modeling Of Leaching Kineticsmentioning

confidence: 99%

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

Asgari¹,

Hassanzadeh²,

Nazari³

et al. 2021

Physicochem. Probl. Miner. Process.

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Although the operating properties of Galvanox TM leaching have been widely studied in the literature, several factors concerning chalcopyrite passivation during the process remain unknown so far. The present work hence aims at investigating the significant effect of externally added pyrite features with a particular focus on its particle size (d80 of 0.52, 20, 45 and 2000 µm) through a series of experiments performed in a 2-L stirred-tank electro-reactor. To this end, the role of pyrite: chalcopyrite ratio (0.49:1, 2:1 and 4:1) and presence of electrical current were examined while the rest of the parameters kept constant (80 °C temperature, 400-500 mV (Ag/AgCl) redox potential, pulp density of 10% (w/v), and stirring rate of 1200 rpm). Plus, kinetic models of the leaching tests were studied based on the diffusion and chemical controlling concepts. It was found that the coarser the pyrite particles, the more favorable the copper extraction from the concentrate due to acceleration of reactions in the cathodic electrode and high mass transfers. However, this was in contradiction with the existing reports in the literature. Moreover, galvanic interactions became intensive in the presence of pyrite meaning extensive chalcopyrite dissolution with significantly reduced passivation. Ultimate copper extraction values of 24.17±1.25%, 55.79±0.91% and 57.26±1.59% were resulted at Py:Cp ratios of 0.49:1 (natural), 2:1 and 4:1, respectively. The results showed that maximum copper recovery of 67.32±2.34% was obtained at an optimum condition of pyrite grain size=2000 µm, Py:Cp=4:1, current application=500 mA, 8 h and 80 °C. Finally, detailed kinetic modeling indicated that the chemical control mechanism was dominant in the early reaction stages (t<3.5 h) concerning the availability of fresh surface for chemical agents; however, the second half of the process (8.0 h>t>3.5 h) was controlled by the diffusion control.

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Kinetics of nickel extraction from Indonesian saprolitic ore by citric acid leaching under atmospheric pressure

Cited by 16 publications

References 13 publications

Highly efficient recovery of ruthenium from integrated circuit (IC) manufacturing wastewater by Al reduction and cementation

Highly efficient recovery of ruthenium from integrated circuit (IC) manufacturing wastewater by Al reduction and cementation

Vanadium removal from spent sulfuric acid plant catalyst using citric acid and Acidithiobacillus thiooxidans

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

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