A Study on the Recovery of Titanium Dioxide from a Blast Furnace Slag, Using Roasting and Acid Leaching

In this research, parameters affecting the recovery of titanium dioxide from Iron slag sample collected from Esfahan Steel Company, located in Esfahan province, Iran, were studied. Roasting with sodium carbonate followed by sulfuric acid leaching was used in this study. The best condition for roasting with sodium carbonate was obtained at the temperature of ۵۰۰oC with Na۲CO۳/slag ratio of ۱/۴, and in ۱۲۰ minutes. The optimum condition for titanium dioxide recovery from iron blast furnace slag was achieved at temperature of ۸۵oC, Solid/Liquid ratio of ۱/۱۵, sulfuric acid concentration of ۲ M in ۲۴۰ minutes time, for -۱۰۶µm sized sample. The maximum recovery was ۵۳%. The kinetic study showed that the leaching process was controlled by the diffusion, in which the activation energy was ۵.۸۵kJ/mol which confirmed the diffusion control of the process.

کلیدواژه ها:

Iron slag ، Roasting ، Titanium dioxide ، Leaching ، Sulfuric acid