Preliminary Study of Preparing Macroporous Titanium Dioxide Material from Panzhihua Ilmenite

Macroporous TiO₂,with the pore size higher than 50 nm,is an important material.This paper proposed and preliminarily studied a method for preparing macroporous titanium dioxide(rutile) from Panzhihua ilmenite by two steps of thermal pretreatment-hydrochloric acid leaching.The results show that both the two processes,weak oxidation(at 600~750℃)-atmospheric hydrochloric acid leaching and the oxidation at low and moderate temperature(such as 800℃)-weak reduction at low temperature(such as 600℃)-atmospheric hydrochloric acid leaching,can be used to prepare macroporous TiO₂ with micrometer and submicron pores from Panzhihua ilmenite.The sizes of the TiO₂ crystals and pores can be regulated by changing the temperature or time of roasting oxidation.When the oxidation temperature is higher or the oxidation time is longer,the sizes of the TiO₂ crystals and pores for the obtained macroporous TiO₂ are bigger.However,the TiO₂ prepared by the methods usually contains some impurities of oxides for Si,Fe,etc.The macroporous TiO₂ prepared by the oxidation at low and moderate temperature-weak reduction at low temperature-atmospheric hydrochloric acid leaching contains much fewer impurities.