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reaction kinetics sulfuric acid leaching

reaction kinetics sulfuric acid leaching

Thermodynamics and Kinetics of Sulfuric Acid Leaching

2021-3-2 The stable zone of HF and Nd 3+ was determined from the ɛ-pH diagram, and the reaction conditions were controlled so that NdF 3 could be converted into HF and Nd 3+ as much as possible to ensure the smooth progress of sulfuric acid leaching reaction.It can be seen from Figures 4–7 that with the increase of temperature and activity, the stability area of HF significantly increased.

Mechanism and kinetics study of sulfuric acid leaching of

2020-3-1 The leaching kinetics indicate that diffusion across the product layer and the interface transfer both affected the decomposition of the TEFS, and the apparent activation energy was24.01 kJ/mol. Reaction temperature was the most important factor that influenced the extraction of Ti, followed by the acid/solid ratio, sulfuric acid concentration

Kinetics of Sulfuric Acid Leaching of Brass

2018-1-3 Kinetics of Sulfuric Acid Leaching of Brass. Effect of Temperature and Acid Concentration: The effect of temperature on the leaching behavior of copper and zinc is shown by the data in Figures 1 through 4. In these experiments, leaching

Kinetics of sulfuric acid leaching of low-grade zinc

2000-4-1 The results of a leaching kinetics study of low-grade zinc silicate ore with sulfuric acid are presented. Effect of ore particle size, reaction temperature, and acid concentration on zinc dissolution rate were determined. The results obtained show that leaching of about 94% of zinc is achieved using −200+270 mesh ore particle size at a

A simple kinetic model for sulfuric acid leaching of

Experimental results obtained in room temperature laboratory leaching studies of lowgrade chrysocolla are interpreted by a kinetic equation of the form 1−(1−R)1/3=(1/αKr c) ln (αkKC 0t+1) derived on the basis of a special form of the shrinking-core model and assuming chemical-reaction control. The experimental program encompasses a large range of particle sizes and reaction times and

Sulfuric acid leaching kinetics of South African chromite

2015-3-4 The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a

Leaching kinetics of neodymium in sulfuric acid from E

2014-3-26 Leaching kinetics of neodymium in sulfuric acid from E-scrap of NdFeB permanent magnet 707 Korean J. Chem. Eng.(Vol. 31, No. 4) powders was leached out, but the effect of chemical reaction

Leaching kinetics of neodymium in sulfuric acid of rare

2014-5-23 We studied the leaching kinetics of recovering neodymium in sulfuric acid from the rare earth elements (REE) slag concentrated by smelting reduction from a magnetite ore containing monazite. The leaching kinetics on neodymium was conducted at a reactant concentration of 1.5 g REE slag per L of 0.3 M H2SO4, agitation of 750 rpm and temperature ranging from 30 to 80 °C. Neodymium oxide included

Kinetics of nickel leaching from low-nickel matte in

2020-6-1 The simple leaching reaction by sulfuric acid can be expressed as follows: MeS + 2H + = Me 2+ + H 2 S(g), where Me represents iron, cobalt and nickel. The Gibbs free energy of the reaction was calculated in the temperature range of 273–473 K. Thermodynamically, the reaction is feasible even at room temperature.

Leaching kinetics of low nickel matte in an aqueous

In the previous study of our group, the kinetics of sulfuric acid leaching was studied, and the kinetic equation and parameters were established, as shown in Eq. . In the absence of saturated sulfate, the reaction order was 0.54 and activation energy of 58.3 kJ·mol −1 was obtained. (5) 1-2 x / 3-1-x 2 / 3 = 57.7 C 0 0.54 · r 0-2 · exp

Thermodynamics and kinetics of sulfuric acid leaching

With rising temperature, the equilibrium constant of the reaction gradually increases, and the stable interval of NdF3 decreases, while that of Nd3+ increases, indicating that high temperature is conducive to the sulfuric acid leaching process, whereof the kinetic results reveal that the activation energy E of Nd transformation is 41.57 kJ/mol

Leaching kinetics of neodymium in sulfuric acid from E

2014-3-26 Leaching kinetics of neodymium in sulfuric acid from E-scrap of NdFeB permanent magnet 707 Korean J. Chem. Eng.(Vol. 31, No. 4) powders was leached out, but the effect of chemical reaction

Sulfuric acid leaching kinetics of South African chromite

2014-6-3 The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a

Kinetics of sulfuric acid leaching of cadmium from Cd-Ni

In this research, the dissolution kinetics of cadmium from Cd-Ni residues produced in NILZ plant has been investigated. Hence, the effects of temperature, sulfuric acid concentration, particle size and stirring speed on the kinetics of cadmium dissolution in sulfuric acid were studied. The dissolution kinetics at 25-55 degrees C and t<or=5 min

Reaction kinetics of bismuth dissolution from lead cake

2012-6-18 Sulfuric Acid Leaching J. D. Miller, J. A. Herbst, and J. L. Sepulveda Abstract-Lead cake, a zinc smelter flue dust residue, consists primarily of lead sulfate. Characteristic properties of lead cake were determined in order to aid the understanding of reaction mechanisms involved in bismuth removal from lead cake by sulfuric acid digestion.

Chalcopyrite Sulfuric Acid Leaching Kinetics

2021-1-13 In the present study, the initial-stage sulfuric acid leaching kinetics of chalcopyrite were studied using radiochemical techniques. Three distinct dissolution rates were observed. The initial rate data were correlated by considering the rapid reaction

Kinetics of Sulfuric Acid Leaching of Boron Slurry

The results of a leaching kinetics study of boron slurry with sulfuric acid were presented. Effect of ore particle size, reaction temperature, and acid concentration on magnesium dissolution rate were determined. The results shown that leaching of about 64.61% of magnesium was achieved using (-200+ 250) mesh ore particle size at a reaction temperature of 60°C for reaction time 100 min with 25

Leaching Kinetics of Praseodymium in Sulfuric Acid of

2015-2-3 Leaching Kinetics of Praseodymium in Sulfuric Acid of Rare Earth Elements (REE) Slag Concentrated by Pyrometallurgy from Magnetite Ore 47 Korean Chem. Eng. Res., Vol. 53, No. 1, February, 2015 the leaching [18,19] that has a shape of a spherical particle, the chemical reaction may be expre ssed in the following Eq. (2). (2) However, the

Abdel-Aal, E.A., “Kinetics of sulfuric acid leaching of

The kinetic data of leaching for both manganese and zinc were found to follow the chemical reaction controlled process, i..e., where, τ = time for complete disappearance of particles and X = fraction of reacted particles. Activation energy of manganese and zinc were found to be 46.27 KJ/mol and 52.39 KJ/mol respectively; which again justified

A Reaction Kinetic Model for the Leaching of Industrial

2013-7-18 Abstract. Zinc ferrite of the general formula (Zn 1−x Fe x 2+) Fe 2 3+ O 4 (x≤0.4) is the principal constituent of the “neutral-leach residues” which are commonly treated by “hot-acid leaching” in electrolytic zinc plants. In this thorough investigation on the kinetics of zinc ferrite acid dissolution, well-characterized, porous zinc ferrite particulates coming from industrial

Thermodynamics and kinetics of sulfuric acid leaching

With rising temperature, the equilibrium constant of the reaction gradually increases, and the stable interval of NdF3 decreases, while that of Nd3+ increases, indicating that high temperature is conducive to the sulfuric acid leaching process, whereof the kinetic results reveal that the activation energy E of Nd transformation is 41.57 kJ/mol

Sulfuric acid leaching kinetics of South African chromite

2014-6-3 The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a

Kinetic study on the leaching of spent nickel oxide

The results of a leaching kinetics study of spent nickel oxide catalyst with sulfuric acid are presented. The effects of spent catalyst particle size, sulfuric acid concentration, and reaction

Kinetics of Sulfuric Acid Leaching of Boron Slurry

The results of a leaching kinetics study of boron slurry with sulfuric acid were presented. Effect of ore particle size, reaction temperature, and acid concentration on magnesium dissolution rate were determined. The results shown that leaching of about 64.61% of magnesium was achieved using (-200+ 250) mesh ore particle size at a reaction temperature of 60°C for reaction time 100 min with 25

Leaching Kinetics of Praseodymium in Sulfuric Acid of

2015-2-3 Leaching Kinetics of Praseodymium in Sulfuric Acid of Rare Earth Elements (REE) Slag Concentrated by Pyrometallurgy from Magnetite Ore 47 Korean Chem. Eng. Res., Vol. 53, No. 1, February, 2015 the leaching [18,19] that has a shape of a spherical particle, the chemical reaction may be expre ssed in the following Eq. (2). (2) However, the

Thermodynamics and Kinetics of Sulfuric Acid Leaching

2021-3-2 During precipitation, the pH value is 6–6.5, the time is 50 min, the precipitation is complete at 318 K, and the total rare earth recovery is 88%. Yang et al. (2020) proposed a new method of borax roasting followed by hydrochloric acid leaching to extract

Abdel-Aal, E.A., “Kinetics of sulfuric acid leaching of

The kinetic data of leaching for both manganese and zinc were found to follow the chemical reaction controlled process, i..e., where, τ = time for complete disappearance of particles and X = fraction of reacted particles. Activation energy of manganese and zinc were found to be 46.27 KJ/mol and 52.39 KJ/mol respectively; which again justified

KINETIC STUDY OF THE MANGANESE MINE TAILINGS

2017-6-9 A kinetic study of the leaching of manganese mining residue by sulfuric acid and potassium oxalate has been investigated. The effects of the reaction agitation speed, manganese ore particle size, acid concentration, oxalate concentration and temperature on manganese rate dissolved. The leaching rates are significantly influenced by the

KINETICS AND MECHANISM OF SPHALERITE LEACHING

2012-10-25 KINETICS AND MECHANISM OF SPHALERITE LEACHING BY SODIUM NITRATE IN SULPHURIC ACID SOLUTION M. Sokić*,#, B.Marković *, V. Matković, D. Živković**, N. Štrbac**, J. Stojanović* *Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia **University of Belgrade, Technical Faculty at Bor, Bor, Serbia (Received 30 November 2011;

A Reaction Kinetic Model for the Leaching of Industrial

2013-7-18 Abstract. Zinc ferrite of the general formula (Zn 1−x Fe x 2+) Fe 2 3+ O 4 (x≤0.4) is the principal constituent of the “neutral-leach residues” which are commonly treated by “hot-acid leaching” in electrolytic zinc plants. In this thorough investigation on the kinetics of zinc ferrite acid dissolution, well-characterized, porous zinc ferrite particulates coming from industrial

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