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.

scholarly journals Nonoxidative Microwave Radiation Roasting of Bastnasite Concentrate and Kinetics of Hydrochloric Acid Leaching Process

ACS Omega ◽  
2020 ◽  
Vol 5 (41) ◽  
pp. 26710-26719
Author(s):  
Qiyuan Zheng ◽  
Yanhui Xu ◽  
Lingxiao Cui ◽  
Shengfeng Ma ◽  
Weihua Guan
Keyword(s):  
Hydrochloric Acid ◽  
Microwave Radiation ◽  
Acid Leaching ◽  
Leaching Process ◽  
Hydrochloric Acid Leaching ◽  
Kinetics Of

Decomposition of mixed rare earth concentrate by NaOH roasting and kinetics of hydrochloric acid leaching process

2020 ◽  
Vol 38 (9) ◽  
pp. 1019-1029
Author(s):  
Mei Li ◽  
Jianfei Li ◽  
Dongliang Zhang ◽  
Kai Gao ◽  
Huihui Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Leaching Process ◽  
Hydrochloric Acid Leaching ◽  
Kinetics Of

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

Kinetics of hydrochloric acid leaching of smithsonite

2011 ◽  
Vol 52 (3) ◽  
pp. 209-216 ◽  
Author(s):  
Nikhil Dhawan ◽  
M. Sadegh Safarzadeh ◽  
Mustafa Birinci
Keyword(s):  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Hydrochloric Acid Leaching ◽  
Kinetics Of

Leaching of Titanium and Silicon from Low-Grade Titanium Slag Using Hydrochloric Acid Leaching

JOM ◽  
2018 ◽  
Vol 70 (10) ◽  
pp. 1985-1990
Author(s):  
Longsheng Zhao ◽  
Lina Wang ◽  
Tao Qi ◽  
Desheng Chen ◽  
Hongxin Zhao ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Low Grade ◽  
Titanium Slag ◽  
Hydrochloric Acid Leaching

Hydrothermal synthesis and structure evolution of metal-doped magnesium ferrite from saprolite laterite

RSC Advances ◽  
2015 ◽  
Vol 5 (112) ◽  
pp. 92778-92787 ◽  
Author(s):  
Zhikai Yan ◽  
Jianming Gao ◽  
Yang Li ◽  
Mei Zhang ◽  
Min Guo
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrochloric Acid ◽  
Acid Leaching ◽  
Synthesis Process ◽  
Structure Evolution ◽  
Magnesium Ferrite ◽  
Leaching Process ◽  
Hydrochloric Acid Leaching ◽  
Metal Doped

Spinel metal-doped magnesium ferrite (MgFe2O4) was synthesized using an atmospheric hydrochloric acid leaching process and hydrothermal synthesis process from saprolite laterite.

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