电化学2017，Vol.23Issue(4)：420-428,9.DOI:10.13208/j.electrochem.160311
海沙钛铁矿在硫酸溶液中的电化学溶解研究
An Electrochemical Dissolution Study of Ilmenite Fraction of Beach Sand in Sulphuric Acid Solution
摘要
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.The cyclic voltammetric studies indicated that the dissolution of ilmenite was very difficult without the addition of carbon powder in ilmenite.The effects ofilmenite-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 was slow at low applied reduction potentials and temperatures.However,the dissolution rate was accelerated at more negatively applied reduction potentials and higher temperatures.The dissolution rate was also increased with the increasing acid concentrations up to 1 mol· L-1.At larger acid concentrations and higher reduction potentials,the dissolution rate was decreased due to the starting of H2 gas evolution which eventually reduced the active surface area of pellet by adsorption.The activation energy was evaluated to be 50 ± 10 kJ·mol-1 in the higher temperature region,while 15 ± 5 kJ·mol-1 in the lower temperature region,suggesting the diffusion controlled process at the lower temperature region and chemically controlled process at the higher temperature region.关键词
钛铁矿/循环伏安/电化学溶解/活化能/硫酸Key words
ilmenite/cyclic voltammetry/electrochemical dissolution/activation energy/sulphuric acid分类
化学化工引用本文复制引用
M.Rostom Ali,R.K.Biswas,Md.Golam Zakaria..海沙钛铁矿在硫酸溶液中的电化学溶解研究[J].电化学,2017,23(4):420-428,9.基金项目
The authors gratefully acknowledge Professor Atshushi Nishikata at Department of Chemistry and Materials Science,Graduate School of Science and Engineering,Tokyo Institute of Technology,Tokyo 152-8552,Japan,for the XRD analysis of the sample.Part of this study has been presented in the 7th International Symposium on Marine Corrosion and Control in Nanjing,China on October 26-28,2014. （）
