Effects of mechanical activation and oxidation-reduction on
hydrochloric acid leaching of Panxi ilmenite concentration
hydrochloric acid leaching of Panxi ilmenite concentration
(1. Department of Biological and Chemical Engineering,
Hunan Mechanical and Technical Polytechnic, Changsha 410151, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Hunan Mechanical and Technical Polytechnic, Changsha 410151, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Abstract: The effects of oxidation-reduction treatment and mechanical activation on the hydrochloric acid leaching performance of Panxi ilmenite concentration were investigated. The results show that both of oxidation-reduction treatment and mechanical activation significantly accelerate the extraction of Fe, Ca and Mg from Panxi ilmenite concentration; however, the CaO and MgO contents of the calcined residues obtained from oxidized-reduced ilmenite concentration are higher than the standard values required by chlorination process. The Ca and Mg in oxidized-reduced ilmenite concentration can be leached much faster after mechanical activation, yielding a synthetic rutile which meets the requirements of chlorination process containing 90.50% TiO2 and 1.37% total iron as well as combined CaO and MgO of 1.00%. The optimum oxidation and reduction conditions are as follows: oxidization at 900 °C in the presence of oxygen for 15 min and reduction at 750 °C by hydrogen for 30 min.
Key words: ilmenite concentration; mechanical activation; oxidation; reduction; hydrochloric acid leaching