Kinetic Study of Iron Dissolution from Low Grade Kaolin Using Oxalic Acid Solutions

2012 ◽  
Vol 1380 ◽  
Author(s):  
A. Martínez-Luévanos ◽  
L. E. Serrato-Villegas ◽  
M. G. Rodríguez-Delgado ◽  
F. R. Carrillo-Pedroza
Keyword(s):  
Oxalic Acid ◽  
Acid Concentration ◽  
Industrial Applications ◽  
Product Layer ◽  
Low Grade ◽  
Acid Solutions ◽  
Iron Dissolution ◽  
Bearing Materials ◽  
Kaolinitic Clay ◽  
Kinetics Of

ABSTRACTKaolin is an important material that is used in industrial applications, including ceramics, paper, paints, fiberglass, inks, pharmaceuticals, and cement. The presence of impurities, particularly iron and titanium bearing materials, imparts color to kaolin. During weathering or hydrothermal alteration, significant levels of iron oxides can be deposited that leave a concentrated kaolinitic clay unusable for industrial application. Therefore, several chemical methods have been applied to kaolin beneficiation in order to reduce these contaminants. Ferric oxide dissolution is of particular interest for producers of industrial minerals such as kaolin. The objective of this work was to examine the kinetics of iron dissolution form low grade kaolin using oxalic acid solutions. The effects of acid concentration and reaction temperature were studied. It was determined that the iron dissolution rate increases with oxalic acid concentration, temperature. Leaching data showed that iron dissolution from low grade kaolin is due to diffusion through the product layer. The activation energy of the process was 46.32 kJ/mol.

Leaching kinetics of iron from low grade kaolin by oxalic acid solutions

2011 ◽  
Vol 51 (4) ◽  
pp. 473-477 ◽  
Author(s):  
A. Martínez-Luévanos ◽  
M.G. Rodríguez-Delgado ◽  
A. Uribe-Salas ◽  
F.R. Carrillo-Pedroza ◽  
J.G. Osuna-Alarcón
Keyword(s):  
Oxalic Acid ◽  
Low Grade ◽  
Acid Solutions ◽  
Leaching Kinetics ◽  
Kinetics Of

Leaching and Kinetic Modeling of Malaysian Low Grade Manganese Ore in Sulfuric Acids

2016 ◽  
Vol 1133 ◽  
pp. 629-633 ◽  
Author(s):  
Suhaina Ismail ◽  
Hashim Hussin ◽  
Syed Fuad Saiyid Hashim ◽  
Norazharuddin Shah Abdullah
Keyword(s):  
Dissolution Kinetics ◽  
Product Layer ◽  
Low Grade ◽  
Manganese Ore ◽  
Leaching Process ◽  
Mixed Control ◽  
New Variant ◽  
Experimental Parameters ◽  
Kinetics Of ◽  
And Diffusion

The leaching process of Malaysian low grade manganese ore (LGMO) using bamboo sawdust (BSD) as reducing agent in acidic medium (H2SO4) and the dissolution kinetics of this ore was investigated. Acid concentration, reaction temperature, and BSD loading were chosen as experimental parameters through application of response surface methodology (RSM). For analysis of the kinetic data in this study, the SCM with surface chemical reaction and diffusion through product layer, the mixed control modelled and also new variant SCM were evaluated. The reaction kinetics of this leaching process was determined, and it is observed that it fits the model of 1-23X-(1-X)23=kt with activation energy of 69.3kJ/mol. The reaction rate for LGMO leaching using BSD was found to be diffusion through product layer.

scholarly journals Kinetics of Manganese Oxides Dissolution in Sulphuric Acid Solutions Containing Oxalic Acid

Engineering ◽  
2013 ◽  
Vol 05 (09) ◽  
pp. 714-719 ◽  
Author(s):  
I. V. Artamonova ◽  
I. G. Gorichev ◽  
E. B. Godunov
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Manganese Oxides ◽  
Acid Solutions ◽  
Kinetics Of

The Dissolution Kinetics of Tincal in Phosphoric Acid Solutions

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Yuksel Abali ◽  
Salih U Bayca ◽  
Ayse E Guler
Keyword(s):  
Particle Size ◽  
Phosphoric Acid ◽  
Dissolution Rate ◽  
Acid Concentration ◽  
Reaction Temperature ◽  
Dissolution Kinetics ◽  
Reaction Model ◽  
Acid Solutions ◽  
Liquid Ratio ◽  
Kinetics Of

In this study, the dissolution kinetics of tincal in phosphoric acid solutions was investigated. The effects of reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed were determined in the experiments. The results showed that the dissolution rate increased with increasing acid concentration, reaction temperature, stirring speed and increased with decreasing particle size and solid to liquid ratio. The dissolution rate was found to be based on the first order pseudo homogenous reaction model. The activation energy of the tincal in phosphoric acid solution was determined as 42.28 kJ.mol-1.

scholarly journals Dissolution Kinetics of Ilmenite Ore in A Binary Solution

2019 ◽  
Vol 4 (7) ◽  
pp. 51-57
Author(s):  
Chukwunonso Chukwuzuloke Okoye ◽  
Okechukwu Dominic Onukwuli ◽  
Chinenye Faith Okey-Onyesolu
Keyword(s):  
Particle Size ◽  
Acid Concentration ◽  
Reaction Temperature ◽  
Binary Solution ◽  
Product Layer ◽  
Solution Temperature ◽  
X Ray ◽  
Solid Ratio ◽  
Oxidant Concentration ◽  
Kinetics Of

Leaching of iron from ilmenite ore using a binary solution (HCl-NaNO3) was investigated. The raw ilmenite ore sample was characterized using Scanning Electron Microscopy (SEM), X-ray diffraction spectroscopy (XRD) and X-ray Flourescence (XRF) techniques. The influence of acid concentration, oxidant concentration, particle size, solution temperature, stirring speed and liquid-to-solid ratios on the extent of dissolution was examined. The experimental data obtained at various process parameter conditions were tested in six kinetics models: shrinking core model’s diffusion through liquid film model(DTLF), diffusion through product layer model (DTPL), surface chemical reaction model (SCR)); mixed kinetics model (MKM), Jander (three dimensional) model and Kröger and Ziegler model. The crystalline morphology of the sample was displayed by the SEM micrograph. XRF result revealed the dominance of titanium and iron in ilmenite while XRD confirmed that ilmenite exist mainly as FeTiO2. The results of the leaching studies showed that ilmenite dissolution in the binary solution increases with increasing acid concentration, oxidant concentration, reaction temperature, stirring speed and liquid-to-solid ratio; while it decreases with particle size. The study showed that 94.77% iron was dissolved by 1MHCl-0.6M NaNO3 at 75μm particle size, 75˚C reaction temperature, 300rpm stirring speed and 30L/g liquid-to-solid ratio. The kinetics of the leaching process was best described by Kröger and Ziegler model with diffusion through the product layer as rate controlling step. The activation energy, Ea, was calculated to be 6.42kJ/mol. The results indicate that HCl-NaNO3 binary solution can be used as an effective lixiviant for extracting iron from ilmenite ores.

Characterization and beneficiation studies for the removal of iron from a china clay from India

Clay Minerals ◽  
2013 ◽  
Vol 48 (5) ◽  
pp. 759-769 ◽  
Author(s):  
B. Kar ◽  
H. Sahoo ◽  
S. S. Rath ◽  
D. S. Rao ◽  
B. Das
Keyword(s):  
Oxalic Acid ◽  
Acid Leaching ◽  
Product Layer ◽  
Total Iron ◽  
Spherical Particles ◽  
China Clay ◽  
Iron Leaching ◽  
Wet Chemical ◽  
Physical Beneficiation ◽  
Kinetics Of

AbstractA china clay sample from Jharkhand State, India, containing 65.0 wt.% SiO2, 22.7% Al2O3, 1.77% Fe2O3and 9.10% LOI was subjected to physical beneficiation and acid leaching studies to improve its quality. The clay was characterized by optical microscopy, XRD, and wet chemical analysis methods. Quartz and goethite are the two major impurities. High intensity magnetic separation removed only 10% of the total iron. Experiments with oxalic acid were carried out to establish the leaching kinetics of iron and the effects of acid concentration, time and temperature on iron leaching were also examined. The study demonstrated that ∼90% of total iron could be removed using 5% oxalic acid. The dissolution of iron from clay is best described by diffusion of ions through the product layer of constant size spherical particles. The activation energy of the leaching process over the temperature range was calculated to be 51.14 kJ/mol.

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