钛渣苏打焙烧改性机理研究

Study on Modification and Mechanism of Titanium Slag by Sodium Carbonate Roasting

钛精矿采用电炉熔炼产出的钛渣TiO_2含量不高,远远达不到氯化法钛白和海绵钛生产对原料的要求。由于富钛料中主要矿物组分--黑钛石(Me_30_5,Me=Ti、Fe、Mg、Mn等)的固溶体结构可被苏打焙烧破坏,使Fe、Mg、Mn等杂质形成的难溶化合物转变为易溶于稀盐酸的物质。实验结果表明,经苏打焙烧后的钛渣,用20%稀盐酸,在110℃酸浸1 h,可使煅烧产物中TiO_2含量达到95. 43%,比不经苏打焙烧直接用稀盐酸浸出的钛渣TiO_2含量提高了12%,比钛渣原料中TiO_2含量提高了近30%。

The titanium slag produced by titanium concentrate and electric-furnace smelting,with low TiO2 content,which is far from the requirements for chloride process titanium dioxide and titanium sponge production. The test results show,the titanium slag after the sodium carbonate roasting is used for acid leaching for one hour at 110℃ temperature with 20% rare hydrochloric acid,the TiO2 content in the calcined product can reach to 95. 43%,which is 12% higher than the TiO2 content in the titanium slag without sodium carbonate roasting,and the TiO2 content is 30% higher than raw titanium slag material.