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.

Dissolution kinetics of cerussite in an alternative leaching reagent for lead

2015 ◽  
Vol 69 (3) ◽  
Author(s):  
Qi-Cheng Feng ◽  
Shu-Ming Wen ◽  
Yi-Jie Wang ◽  
Qin-Bo Cao ◽  
Wen-Juan Zhao
Keyword(s):  
Dissolution Kinetics ◽  
Product Layer ◽  
Surface Chemical ◽  
Surface Chemical Reaction ◽  
Mixed Control ◽  
Shrinking Core ◽  
Two Stages ◽  
Kinetics Of ◽  
And Diffusion ◽  
Rate Controlling Step

AbstractThe dissolution kinetics of cerussite was investigated using methanesulphonic acid (MSA) as an alternative leaching reagent. The effects of particle size, stirring speed, acid concentration, and reaction temperature on the lead dissolution rate were determined. The dissolution process followed the kinetic law of the shrinking-core model, and a corresponding mixed control model was found suitable for representing the rate-controlling step. The mixed kinetic model comprised two stages: surface chemical reaction (283 K to 303 K) and diffusion through the product layer (303 K to 323 K). The activation energies of these sequential stages were 43.20 kJ mol

Leaching process and kinetics of manganese in low-grade manganese ore

2013 ◽  
Vol 32 (2) ◽  
pp. 222-226 ◽  
Author(s):  
Chao Xie ◽  
Longjun Xu ◽  
Tiefeng Peng ◽  
Kun Chen ◽  
Jing Zhao
Keyword(s):  
Low Grade ◽  
Manganese Ore ◽  
Leaching Process ◽  
Kinetics Of

scholarly journals Application of the Shrinking-Core Models for Determination of Dissolution Kinetics of Mn and Zn from Spent Zinc–Carbon Battery Powder in Organic Acid Solution

2019 ◽  
Vol 27 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Tevfik Agacayak ◽  
Hasan Ali Taner
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Dissolution Kinetics ◽  
Kinetic Studies ◽  
Product Layer ◽  
Different Temperatures ◽  
Shrinking Core ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

Abstract In this study, dissolution kinetics of manganese and zinc from spent zinc–carbon batteries in acetic acid solution was investigated. To determine the kinetics of dissolution of manganese and zinc, shrinking core model was applied to dissolution recoveries obtained at different temperatures. As a result of kinetic studies, it was determined that manganese and zinc were dissolved in acetic acid solution by diffusion from product layer and then activation energies (Ea) were calculated.

scholarly journals Acidic leaching of iron from Kaoje Goethite ore by hydrochloric acid: Kinetics modelling

2020 ◽  
Vol 39 (3) ◽  
pp. 800-806
Author(s):  
K.I. Ayinla ◽  
A.A. Baba ◽  
S. Girigisu ◽  
O.S. Bamigboye ◽  
B.C. Tripathy ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Dissolution Kinetics ◽  
Second Phase ◽  
Low Grade ◽  
Iron And Steel ◽  
Kinetics Modelling ◽  
Shrinking Core ◽  
Hcl Concentration ◽  
Kinetics Of

Considering the recent focus of the Nigeria Government to grow and develop the nation’s economy through the solid minerals sector reform, this study has been devoted to the kinetics of a Nigerian goethite ore by hydrochloric acid leaching for improved iron and steel industries applications. This study was performed in three different phases. In the first phase, acidic leaching of iron from a goethite ore was examined and the influence of the operating variables including: HCl concentration, leaching temperature, stirring speed and particle sizes was examined experimentally. The optimum condition was found to be HCl concentration of 1.81M, temperature of 80°C, 200 rpm stirring speed and particle size 0.09 μm for iron in the range of investigated parameters. Under those conditions, the highest iron recovery was obtained to be 95.67 %. In the second phase, the dissolution kinetics of iron was evaluated by the shrinking core models. The finding reveals that diffusion through the fluid was the leaching kinetics rate controlling step of the iron. The activation energy (Ea) was found to be 14.54 kJmol-1 for iron. Equation representing the leaching kinetic of iron was achieved to be 1−2/3α - (1 − x)2/3 = 0.7272 × e−38.29/8.314×T × t. The final stage of the experiment was carried out by characterizing the leached residues by X-ray diffractometer (XRD) and scanning electron microscopy (SEM), the result showed majorly the presence of rutile (TiO2), anglesite (PbSO4), and traces of iron-silicate face like pyrite (FeS), quartz (SiO2). Keywords: kinetics modelling, leaching, low-grade, recovery, shrinking core

Preliminary Studies on Acid Leaching of Finely-Ground Malaysian Low Grade Manganese Ore (LGMO)

2016 ◽  
Vol 840 ◽  
pp. 364-368 ◽  
Author(s):  
Mohd Fasyraf Hafizi Mohd Rozali ◽  
Nurulfazielah Nasir ◽  
Suhaina Ismail ◽  
Norazharuddin Shah Abdullah
Keyword(s):  
Sulfuric Acid ◽  
Fine Particle ◽  
Acid Leaching ◽  
Reducing Agents ◽  
Low Grade ◽  
Manganese Ore ◽  
Particle Sizes ◽  
Leaching Process

Ore samples, believed to be low grade manganese ore were characterized using XRD, XRF and SEM, before being ground further into very fine particle sizes going through a preliminary leaching process. Sulfuric acid was chosen as the leachant, and leaching was done without any presence of reducing agents.

Leaching of Niobium from Low-Grade Refractory Ore Using H2SO4 Roast System

2014 ◽  
Vol 997 ◽  
pp. 651-654 ◽  
Author(s):  
Biao Wu ◽  
He Shang ◽  
Wen Cheng Gao ◽  
Jian Kang Wen
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Weight Ratio ◽  
Dissolution Kinetics ◽  
Low Grade ◽  
Mass Ratio ◽  
Improved Method ◽  
Dilute Sulfuric Acid ◽  
Roasting Temperature ◽  
Kinetics Of

A new improved method is proposed for the leaching and extraction of niobium from a low-grade refractory niobium–tantalum ore.The ore was roasted and decomposed with concenrated H2SO4 then leached with dilute sulfuric acid. The effects of various factors, such as roasting temperature and time, acid to ore mass ratios,as well as particle size, on the dissolution kinetics of niobium were comprehensively investigated. The optimal conditions were particle size-38μm, roasting temperature 300°C,reacting time 2h and acid to ore mass ratio 1:1. The roasting residue reacted for 2 h with sulfuric acid in the ore/acid weight ratio of 3:1 at 90°C, the niobium was recoveried as high as 90.3%.

scholarly journals Kinetics of the Leaching Process of an Australian Gibbsitic Bauxite by Hydrochloric Acid

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Aichun Zhao ◽  
Ting-an Zhang ◽  
Guozhi Lv ◽  
Wenyan Tian
Keyword(s):  
Activation Energy ◽  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Low Grade ◽  
Good Theory ◽  
Alumina Production ◽  
Work Analysis ◽  
Leaching Process ◽  
Hydrochloric Acid Leaching ◽  
Kinetics Of

Gibbsitic bauxite from Australia was leached by hydrochloric acid in this work. Analysis on kinetics for the extraction of Al2O3was quantitatively studied. It was concluded that the hydrochloric acid leaching process of gibbsitic bauxite was controlled by chemical reaction. Moreover, the mechanism for the dissolution followed the equation,ln⁡k=39.44-1.66×104(1/T), with an apparent activation energy of 137.90 kJ/mol, according to the equation ofk=Ae-Ea/RT. This work aims to provide a good theory support for the process control by using a new method of alumina production from the low grade bauxite.

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.

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