关键词: 含钛高炉渣, 二氧化钛, 回收

Abstract: A melting reaction process was developed to transform the titanium in titanium-bearing blast furnace slag into water-soluble one, such as TiOSO₄ by the treatment with ammonium sulfate and potassium bisulfate, to recover titanium. The effects of quantities of ammonium sulfate and potassium bisulfate added, reaction temperature and holding time on the recovery rate of titanium were investigated systemically. The experimental results showed that reaction temperature and holding time have a great impact on the recovery of titanium. The recovery rate of titanium was improved with an increase of reaction temperature and holding time. The optimum conditions of titanium recovery from titanium-bearing blast furnace slag were as follows: the mass ratio of slag to ammonium sulfate 1∶6, reaction temperature 350℃, and holding time 27 min. Under such conditions the recovery rate of titanium was up to 91. 7% and the evaporation loss rate of nitrogen from (NH₄)₂SO₄ was 81.5%. The residue obtained after recovery of titanium was mainly composed of CaSO₄·H₂O, CaSO₄·0.5H₂O, SiO₂, a small amount of CaTiO₃ and Ca₂Al₂SiO₇. This study promises significant economic benefits for smelting enterprise.

Key words: titanium-bearing blast furnace slag, titanium dioxide, recovery