Kinetics of rare earth leaching from roasted ore of bastnaesite …
Under selected leaching conditions, including particle size (0.074–h0.100 mm), sulfuric acid concentration 1.50 mol/L, mass ratio of liquid to solid 8 and stirring speed 500 r/min, the leaching kinetics analysis shows that the reaction rate of leaching process is controlled by diffusion through the product/ash layer which can be described by ...Web
اقرأ أكثرKinetics and mechanisms of leaching of rare earth elements from
Abstract. The study of the kinetics of REEs from secondary resources and the understanding of the mechanisms governing the leaching reactions are fundamental aspects for the design and the optimization of industrial processes. Despite their interest, the kinetic aspect of these valuable elements from secondary resources has not been …Web
اقرأ أكثرA kinetic study of the leaching of a low-grade niobium–tantalum …
A kinetic study of the leaching of a low-grade niobium–tantalum ore by concentrated KOH solution @article{Zhou2005AKS, title={A kinetic study of the leaching of a low-grade niobium–tantalum ore by concentrated KOH solution}, author={Hong Zhou and Shili Zheng and Yi Zhang and Danqing Yi}, journal={Hydrometallurgy}, year={2005}, …Web
اقرأ أكثرMicrowave efficient extraction of manganese from low-grade …
Leaching kinetic study of Mn. Leaching kinetics were investigated to study the interaction mechanism in the leaching system. A comprehensive assessment of the leaching kinetics of manganese based on the shrinkage core model (SCM) was performed [45, 46]. In general, the SCM can be summarized into three main speed control steps, …Web
اقرأ أكثرHydrometallurgical leaching and kinetic modeling of low
Manganese was leached from a low-grade manganese ore (LGMO) using banana peel as the reductant in a dilute sulfuric acid medium. The effects of banana peel amount, H2SO4 concentration, reaction temperature, and time on Mn leaching from the complex LGMO were studied. A leaching efficiency of ∼98% was achieved at a …Web
اقرأ أكثرKinetics of sulfuric acid leaching of low-grade zinc silicate ore
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 ...Web
اقرأ أكثرA novel approach to extract Nb, Y and Ce from a niobium
In this work, a novel approach of leaching valuable metals, such as niobium, yttrium and cerium, from a niobium-bearing ore of low grade by roasting …Web
اقرأ أكثرLeaching kinetics and predictive models for elements
The results of the kinetic mechanism study showed that the shrinking core model can be used to describe the leaching process, and the leaching rate was controlled by the mixed controlled mechanism (diffusion and chemical reaction). The activation energies of copper, cobalt and iron leaching were 24.0, 28.1 and 19.5 kJ/mol, …Web
اقرأ أكثرLow-Cost Route for Preparing Carbon–Silica Composite
For adsorption kinetic study, the reaction time varied from 0 to 100 min with solution initial concentration of 100 mg/L at 298 K. For adsorption isotherms study, solution initial concentrations ranged from 60 to 200 mg/L with reaction time 24 h at 298 K, 318 K and 338 K, respectively. ... In this research, the low-cost acid leaching ...Web
اقرأ أكثرFerric leaching of the sphalerite contained in a bulk concentrate
This study is focused on the sphalerite dissolution with ferric sulphate, as the first stage of the treatment of Cu-Zn-Pb concentrates. The ferric ion concentration, the temperature and the particle size have an important role in the sphalerite oxidation. However, the initial sulphuric acid, ferrous ion and sulphate ion concentrations have no ...Web
اقرأ أكثرMinerals | Free Full-Text | Kinetic Study of the Leaching of Low …
The reductive leaching of manganese from a low-grade manganese oxide ore was investigated by using pretreated sawdust as the reductant in a sulfuric acid medium. The effects of stirring speed, liquid/solid ratio, sawdust/ore mass ratio, sulfuric acid concentration, reaction temperature, and time on the manganese extraction were …Web
اقرأ أكثرPressure Leaching of Chalcopyrite Concentrate with Oxygen and Kinetic
In this research work, the pressure leaching of chalcopyrite concentrate with oxygen was studied. Experiments were carried out under conditions of the solid–liquid ratio of 0.1, agitation speed of 750 rpm, and sulfuric acid concentration of 2 M in a stainless-steel autoclave system under 0.6 to 1 MPa oxygen gas. Central composite design was used to …Web
اقرأ أكثر(PDF) Kinetic Study of the Leaching of Low-Grade
PDF | The reductive leaching of manganese from a low-grade manganese oxide ore was investigated by using pretreated …Web
اقرأ أكثر(PDF) Effect of basic washing parameters on the chemical
Leaching kinetics of K, S, ash, N, and Cl (the trend line shown in each figure is of the second-order kinetics model, and the data points are from the experimental results). Comparison between ...Web
اقرأ أكثرKinetic study on leaching of Zn and Cu from spent low
In the present investigation, the kinetic study of the hydrometallurgical based leaching of Zn and Cu from the spent low-temperature shift catalyst (CuO/ZnO/Al 2 O 3) have been performed. Additionally, the process parameters affecting the leaching process have been optimized by Taguchi's orthogonal array design.Web
اقرأ أكثرProcess Optimization and Kinetics of Leaching Magnesium from Low …
Thus, it can be determined that the kinetic equation of leaching of low-grade magnesite in ammonium bisulfate solution is consistent with the surface chemical reaction model. Fig. 6 (a) Plots of 1 − 2/3x − (1 − ... Based on the kinetic data in this study, the above analysis further suggests that the leaching process of low-grade magnesite ...Web
اقرأ أكثرKinetic Investigation on Leaching of Copper from a Low-Grade …
In this study, the reject fraction of the jaw crusher, located in the first part of the crushing circuit, is used as a considerable stock in copper tank-leaching plant. High market value of copper and ease of practice were the motivating forces on studying the leaching kinetics under controlled conditions. In this regard, first, the influencing …Web
اقرأ أكثرKinetics of nickel leaching from low-nickel matte in sulfuric acid
The goal of this study was to investigate the influence of leaching temperature on Ni and Fe recovery, as well as the best kinetic model to represent the leaching process of these metals.Web
اقرأ أكثرKinetic Study of the Leaching of Low-Grade Manganese …
The kinetic analysis was carried out based on the shrinking core model, which indicated that the reductive leaching process was controlled by the chemical reaction. The …Web
اقرأ أكثرComparative study for leaching processes of uranium, copper
In this paper, leaching characteristics are presented, and a cost-effective process for extracting uranium, copper, and cadmium from Talet Seleim's Gibbsite is developed. H2SO4 was chosen as the preferable leaching agent based on the agitation experiment's findings. The leaching efficiencies of U, Cu, and Cd attained 95%, 90%, …Web
اقرأ أكثرKinetic Study of the Leaching of Low-Grade Manganese …
respectively. The apparent activation energy for the leaching process has been calculated using the Arrhenius expression and was found to be 51.7 kJ/mol. Keywords: low-grade manganese ore; pretreated sawdust; reductive leaching; kinetic study 1. Introduction Manganese, one of the important strategic metals, is widely used in metallurgy, the ...Web
اقرأ أكثرProcess and Kinetics of Extracting Cobalt from Complex High
The leaching of Co proceeds gradually at low temperature, such that the leaching reactions achieve equilibrium slowly, from the perspective of thermodynamics.23 It is possible that sulfuric acid leaching of Co is controlled by an interface chemical reaction, which will be considered in the discussion below on the kinetics. When the temperature ...Web
اقرأ أكثر(PDF) Kinetic Study in Atmospheric Pressure Organic Acid Leaching
This study aims to develop a mathematical model that can explain the mechanism of the leaching process of laterite ore using a low concentration of the citric acid solution and evaluate that model ...Web
اقرأ أكثرProcess improvement and kinetic study on copper leaching …
Abstract: Process improvement and kinetic study on copper leaching from low-grade cuprite ores in sulfuric acid solution are presented in this paper. Effects of major leaching parameters on copper leaching efficiency are determined. The results indicate that copper minerals in the raw ores are mainly cuprites.Web
اقرأ أكثرKinetic study of the leaching of manganese mine tailings by …
A kinetic study of the leaching of manganese mining residue by sulphuric acid and potassium oxalate has been investigated. The effects of the agitation speed, manganese ore particle size, acid concentration, oxalate concentration and temperature on the manganese dissolution rate was determined. The leaching rate is significantly …Web
اقرأ أكثرA kinetic investigation into the pressure oxidation of sphalerite from
In the current study, a numerical mechanistic kinetic model for direct leaching of zinc from iron containing sphalerite concentrate is presented. The model is based on the well-known shrinking-core model approach. However, in order to consider possible chemical changes that might take place in the liquid phase the model is solved …Web
اقرأ أكثرKinetics of pressure leaching of niobium ore by sulfuric acid
The current study was carried out to investigate the kinetics of pressure leaching of niobium ore in sulfuric acid media. The effects of stirring speed, oxygen pressure, sulfuric acid concentration, particle size and temperature on the leaching efficiency of niobium were studied. ... A kinetic study of the leaching of a low-grade …Web
اقرأ أكثرDirect Acid Leaching of Sphalerite: An Approach Comparative and
Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous ...Web
اقرأ أكثرA kinetic study of the leaching of a low-grade niobium–tantalum …
A new leaching process for a low-grade refractory tantalumniobium ore by KOH sub-molten salt was studied. The effects of leaching temperature, initial KOH …Web
اقرأ أكثرA kinetic study of the leaching of a low-grade niobium–tantalum …
A kinetic study of the leaching of a low-grade niobium–tantalum ore by concentrated KOH solution. Hydrometallurgy 80 (3):170-178. 10.1016/j.hydromet.2005.06.011. This person is not on ...Web
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