Research on mining filling material prepared by high titanium metallurgy waste residue

Using the vanadium titano-magnetite for iron-making, the steel enterprises have discharged water-quenched Ti-bearing slag. Due to the high titanium content, low activity and difficult-to-use characteristic, there are vast amount of high titanium slags, which not only occupies the land, but also causes resources wasting and environment polluted. This paper analyzed the chemical component, microstructure, grindability, activity index and other factors of high titanium slag and studied the mining filling material prepared by high titanium slag. The results show that the main chemical components of high titanium slag are similar with the ordinary slag. Both of them consist of CaO, SiO₂ and Al₂O₃, all of which account for about 80% of the total weight. However, the content of TiO₂ accounts for 8.4%, which is much higher than that of ordinary slag. Therefore, the grindability of TiO₂ is poor. The solid waste cementitious material was prepared by slag, flue gas desulfurization gypsum and high titanium slag, whose specific surface area was 530 m²/kg. After the maintenance for 28 hours, the compressive strength of this material reaches 3MPa. (paper)