An electrochemical dissolution study of ilmenite fraction of beach sand in sulphuric acid solution

Authors

Rostom Ali M., Department of Applied Chemistry and Chemical Engineering, Rajshahi University,Rajshahi-6205, Bangladesh;Follow
K. Biswas R., Department of Applied Chemistry and Chemical Engineering, Rajshahi University,Rajshahi-6205, Bangladesh;
Golam Zakaria Md., Department of Applied Chemistry and Chemical Engineering, Rajshahi University,Rajshahi-6205, Bangladesh;

Corresponding Author

Rostom Ali M.(dmrali@yahoo.com)

Abstract

Electrochemical techniques have been used to investigate the dissolution behaviors of ilmenite fraction of beach sand of Bangladesh in sulfuric acid solutions at various temperatures. It is seen from the cyclic voltammetric studies indicated that the dissolution of ilmenite is was very difficult without the addition of carbon powder in ilmenite. The effects of ilmenite-carbon ratio, acid concentration and temperature on cyclic voltammograms have been investigated to understand the dissolution process of ilmenite. The investigated results showed that the dissolution rate of ilmenite (FeTiO₃) is was slow at low applied reduction potentials and temperatures. However, the dissolution rate was increases accelerated at more negatively applied reduction potentials and higher temperatures. The dissolution rate was also increases increased with theon increasing acid concentrations up to 1 mol•dm^-3; . and aAt more larger acid concentrations and higher reduction potentials, ithe dissolution rate was decreases decreased due to the starting of H₂ gas evolution which eventually decreases reduced the active surface area of pellet by adsorption. The activation energy (Ea) is was evaluated to be 50±10 kJ•mol^-1 in the higher temperature region, (htr) andwhile 15±5 kJ•mol^-1 in the lower temperature region (ltr)., The value of activation energy suggestsing the process to be diffusion controlled process at the lower temperature regionltr and chemically controlled process at the higher temperature regionhtr.

Graphical Abstract

Keywords

ilmenite, cyclic voltammetry, electrochemical dissolution, activation energy, sulphuric acid

DOI Link

https://doi.org/10.13208/j.electrochem.160311

Publication Date

2017-08-25

Online Available Date

2016-06-13

Revised Date

2016-05-14

Received Date

2016-03-11

Recommended Citation

Rostom Ali M., K. Biswas R., Golam Zakaria Md.. An electrochemical dissolution study of ilmenite fraction of beach sand in sulphuric acid solution[J]. Journal of Electrochemistry, 2017 , 23(4): 420-428.
DOI: 10.13208/j.electrochem.160311
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss4/6