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

摘要： 以承钢含钛高炉渣、(NH₄)₂SO₄和KHSO₄为主要原料，通过熔融反应法使其中的钛转化为易溶于水的形式，达到回收钛的目的。考察了(NH₄)₂SO₄加入量、KHSO₄加入量、加热温度和保温时间对钛回收率的影响。实验结果表明，反应温度和保温时间对钛回收率的影响较大。回收钛的最适条件为：含钛高炉渣与(NH₄)₂SO₄的质量比为1∶6，反应温度为350℃，保温时间为27 min，在此条件下钛的回收率为91.7%，硫酸铵中氮的挥发损失率为81.5%。回收钛后所得残渣主要含有大量硫酸钙、二氧化硅和少量钙钛矿、钙铝黄长石。

关键词: 含钛高炉渣, 二氧化钛, 回收