Decomposition of ilmenite by ZnO/ZnS: Enhanced leaching in acid solutions

作者：Arachchi N D H; Peiris G S; Shimomura M; Jayaweera P M^*

来源：Hydrometallurgy, 2016, 166: 73-79.

DOI：10.1016/j.hydromet.2016.09.001

• Ilmenite
• XPS
• XRD
• Acid leaching
• Roasting
• ZnO/ZnS

Acid leaching of ilmenite (FeTiO3) obtained from beach sand was found to be more effective when roasted with ZnO or ZnS at 900 degrees C. Remarkably higher iron and titanium leaching rates were observed when compared with normal ilmenite in 5.0 M HCl at 30 degrees C and 6.0 M H2SO4 at 110 degrees C, respectively. Roasting of ilmenite with ZnO or ZnS converts acid resistant FeTiO3 to more reactive Fe2O3 and Zn2TiO4, resulting in enhanced leaching. Roasting FeTiO3 with ZnS generates SO2 as a byproduct, which can be used to produce H2SO4 acid required in the sulfate process. Added ZnO or ZnS can be recovered as ZnO, therefore the overall process acts as a catalytic decomposition of FeTiO3. Ores containing ZnS, such as sphalerite, are possible raw materials instead Of ZnS, in a commercial application. XRD analysis confirms the formation of zinc titanate, and XPS results indicate the presence of both Fe2+/Fe3+ in naturally weathered ilmenite.

• 出版日期2016-12