The Influence of SiO_2 on the Extraction of Ti Element from Ti-bearing Blast Furnace Slag

摘要

The present paper investigated the crystallization behavior of Ti-concentrating phases in titanium-bearing blast furnace slags influenced by the silica content. The objective was to recycle the titanium from titanium-bearing blast furnace slags by enriching Ti element in anosovite. The effect of SiO_2 on the formation of anosovite in the titanium-bearing blast furnace slags was studied under C/CO equilibrated atmospheres using a combination of X-ray Diffraction (XRD) and Energy Dispersive X-ray Spectroscopy (EDX). It was found that, under the C/CO equilibrated atmospheres, the formed primary phases transformed from perovskite to anosovite by adding SiO_2 up to 35 wt% in the slags. The related mechanism was investigated according to the theory of molten slags structure and the principle of thermodynamics.