Leaching kinetics of spent nickel–cadmium battery in ...

2016-10-1  Leaching kinetics of spent Ni–Cd battery powder in sulfuric acid medium was studied. • Cadmium leaching was very fast giving rise to 99.5% recovery within 2 min. •

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Leaching kinetics of spent nickel-cadmium battery in ...

Leaching kinetics of spent nickel-cadmium battery in sulphuric acid - [email protected] Acid leaching process for recovering nickel and cadmium from spent Ni-Cd

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Leaching kinetics of spent nickel-cadmium battery in ...

The novelty of the present study was high recovery of nickel (96%) and cadmium (99.5%) by leaching of spent Ni-Cd batteries using dilute sulfuric acid (10vol.%) at

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Leaching behaviour of electrode materials of spent nickel ...

The study here presented deals with the first chemical stage of an integrated process, the leaching of spent nickel–cadmium electrodes with sulphuric acid. The

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Leaching Kinetics of Mo, Ni, and Al Oxides from Spent ...

2021-3-19  The effect of grinding, stirring speed, H 2 SO 4 concentration, and temperature on the leaching rate of spent catalyst was investigated. Leaching

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Kinetics of nickel leaching from spent catalyst in ...

The kinetics of nickel leaching from spent NiO/Al2O3 catalyst was investigated using sulfuric acid as leaching reagent. Leaching experiments were carried out

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Leaching of base metals from spent Ni–metal hydride ...

2015-12-1  The kinetics of the leaching of base metals follows the shrinking core chemical controlled model governed by the reaction of the lixiviant on the surface of the

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Process optimization and kinetics for leaching of rare ...

2016-5-1  The spent nickel metal hydride batteries are an alternative source of the rare earth metals like La, Ce, Sm, Nd and Pr along with some base metals. Optimum conditions

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Citric acid mediated leaching kinetics study and ...

The extraction and leaching kinetics of V from the spent catalyst (3.06 %V, 10.01% Fe and 0.52 % Mg) was investigated using organic citric acid. The characterization

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Kinetics of leaching: a review Request PDF

2020-8-4  The leaching kinetics of nickel laterite ore can be described successfully by the diffusion through the product layer control model.

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Leaching kinetics of spent nickel–cadmium battery in ...

2016-10-1  2016-10-1  Leaching kinetics of spent Ni–Cd battery powder in sulfuric acid medium was studied. • Cadmium leaching was very fast giving rise to 99.5% recovery within 2 min.. Ni recovery was only ~ 23% due to passivation of metallic nickel in sulfuric acid. Addition of hydrogen peroxide highly enhanced the nickel recovery.

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Leaching kinetics of spent nickel-cadmium battery in ...

Leaching kinetics of spent nickel-cadmium battery in sulphuric acid. ... Spent nickelcadmium batteries were heated over range of 300C to 600C for 2 hours and each component was completely ...

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Leaching kinetics of spent nickel-cadmium battery in ...

Acid leaching process for recovering nickel and cadmium from spent Ni-Cd batteries consumes concentrated acid solution and operate at quite high temperature. The present paper reports improved nickel and cadmium recoveries in sulphuric acid leaching of Ni-Cd battery powder at relatively lower temperatures. The spent Ni-Cd battery powder containing about 69% Ni, 15% Cd and 0.94% Fe was

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Leaching behaviour of electrode materials of spent nickel ...

The novelty of the present study was high recovery of nickel (96%) and cadmium (99.5%) by leaching of spent Ni-Cd batteries using dilute sulfuric acid (10vol.%) at moderate temperature (328K ...

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Leaching Kinetics of Mo, Ni, and Al Oxides from Spent ...

2021-3-19  Abstract Spent Ni–Mo hydrodesulfurization catalyst (HDS) includes a considerable amount of Mo, Ni, and Al and is used as an important secondary resource for the recovery of valuable metals. The effect of grinding, stirring speed, H2SO4 concentration, and temperature on the leaching rate of spent catalyst was investigated. Leaching behavior of MoO3, NiMoO4, Al2O3, and AlPO4 from spent ...

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Leaching Kinetics of Mo, Ni, and Al Oxides from Spent ...

Request PDF Leaching Kinetics of Mo, Ni, and Al Oxides from Spent Nickel–Molybdenum Hydrodesulfurization Catalyst in H2SO4 Solution Spent Ni–Mo

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Process optimization and kinetics for leaching of rare ...

2016-5-1  Investigated H 2 SO 4 leaching of rare earth metals (REMs) from spent Ni–MH batteries.. Optimized leaching conditions: 2 M H 2 SO 4, 348 K, 120 min and 100 g/L pulp density.. Achieved recovery of 98.1% Nd, 98.4% Sm, 95.5% Pr and 89.4% Ce. • Established chemical control kinetic model for leaching REMs by XRD and SEM studies.

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Citric acid mediated leaching kinetics study and ...

The extraction and leaching kinetics of V from the spent catalyst (3.06 %V, 10.01% Fe and 0.52 % Mg) was investigated using organic citric acid. The characterization of the spent catalyst sample by XRD, EDAX and SEM was examined to ascertain the existence of V, Mg and Fe in

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Leaching kinetics of cobalt from the scraps of spent ...

Based on physicochemical properties of the scraps of spent aerospace magnetic materials, a roasting - magnetic separation followed by sulfuric acid leaching process was proposed to extract cobalt. Roasting was performed at 500 °C to remove organic impurity. Non-magnetic impurities were reduced by magnetic separation and then the raw material was sieved into desired particle sizes.

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Kinetics of leaching: a review Request PDF

There were two distinct stages in the leaching process for dephosphorization, and the kinetics of both stages followed a shrinking core model. The apparent activation energy for leaching in ...

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Process optimization and kinetics for leaching of rare ...

The conditions for the leaching of REMs from the spent batteries were optimized as: 2M H2SO4, 348K temperature and 120min of time at a pulp density (PD) of 100g/L. Under this condition, the leaching of 98.1% Nd, 98.4% Sm, 95.5% Pr and 89.4% Ce was achieved.

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Bioleaching kinetics and multivariate analysis of spent ...

Various leaching parameters such as contact time, pH, oxidant concentration, pul Bioleaching kinetics and multivariate analysis of spent petroleum catalyst dissolution using two acidophiles J Hazard Mater. 2010 Mar 15;175(1-3):267-73. doi: 10.1016/j.jhazmat.2009.09.159. ...

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Leaching Kinetics of Platinum and Palladium from Spent ...

2012-2-7  The spent catalysts used in this study (-60+70 mesh to -120+140 mesh) were analyzed to be 3791 ppm platinum and 1306 ppm palladium. High initial rates for both platinum and palladium were obtained for the early stages of leaching and were followed by rapid decay up to about 110 minutes and 50 minutes respectively.

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Leaching kinetics of cobalt from the scraps of spent ...

2018-4-5  Leaching kinetics of cobalt from the scraps of spent aerospace magnetic materials. Xuejiao Zhou School of Metallurgy and Environment, Central South University, Changsha 410083, China; School of Metallurgical and Materials Engineering, Chongqing University

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Leaching kinetics of cobalt from the scraps of spent ...

Avrami equation can well describe the leaching kinetics of cobalt from the scraps. Abstract Based on physicochemical properties of the scraps of spent aerospace magnetic materials, a roasting – magnetic separation followed by sulfuric acid leaching process was proposed to extract cobalt.

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Kinetics Study on Molybdenum Leaching from Spent

2017-5-19  The aim of the present work is to study the kinetics of leaching process of spent catalyst Ni, Mo/Al 2 O 3 in order to recover the molybdenum using ammonium hydroxide. The investigation depends on the results of previous work ( Mousa et al, 2012). The experiments were conducted in 1

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Recycling of the Spent Nickel-Cadmium Batteries Based on ...

Less than 1 percent of discarded dry batteries are recovered in china.it is necessary to find an economic,fast and environmentally friendly process to recycle spent dry batteries.Bioleaching is better one of the few technology applied for the recovery of the toxic metals from hazardous spent batteries.In this study,after the acidified sludge made by the inoculated and cultured indigenous ...

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Process for recycling mixed-cathode materials from spent ...

After discharge at 1 C for 300 cycles, the NCM-spent material remained a higher capacity of 113.2 mA h g-1 than the NCM-syn (78.4 mA h g-1). The better performance of the NCM-spent resulted from trace Al doping. A new formulation based on the shrinking-core model was proposed to explain the kinetics of the leaching process.

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Ammonia leaching mechanism and kinetics of LiCoO2

2021-7-1  In this paper, the ammonia leaching process and high-energy ball milling method were adapted to recover spent LiCoO 2 material. The ammonia reduction leaching mechanism of LiCoO 2 material in the ammonia-sodium sulfite-ammonium chloride system was elucidated. Compared with untreated LiCoO 2 material, the leaching equilibrium time of LiCoO 2 after ball-milled for 5 h was

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Leaching efficiency and kinetics of the recovery of ...

2019-1-3  Leaching efficiency and kinetics of the recovery of palladium and rhodium from a spent auto-catalyst in HCl/CuCl 2 media. Carlos A. Nogueira Laboratório Nacional de Energia e Geologia, I.P., Lisboa, Portugal Correspondence [email protected] View further author information

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