活化焙烧-酸浸法富集中低品位富钛料

Enrichment of moderate and low grade titania feedstock by activated roasting-acidic leaching

采用还原磨选法制得的富钛料TiO2品位低,不适合直接作生产氯化法钛白和海绵钛的原料。热力学分析表明,采取添加Na2CO3进行焙烧处理后,可破坏富钛料中主要矿物组分黑钛石(Me3O5型固溶体,Me=Ti、Fe、Mg、Mn等)的固溶体结构,使固溶于其中的杂质元素铁和镁等转变为易溶于稀盐酸的物质。结果表明,用稀盐酸浸出活化富钛料可使浸出产物TiO2品位提高到90%以上,比直接用稀盐酸浸取未经活化的富钛料浸出产物TiO2的品位提高了近10%。

The grade of TiO2 for titanium slag produced by reduction-grinding separation was low and the TiO2 was not suitable for preparation of pigment and sponge titanium. Thermodynamic analysis shows that solid solution of anosvite（Me3O5） in titania feedstock is damaged and the impurities （Fe, Mg, Ca, etc） dissolve into solution by dilute hydrochloric acidic after activated roasting with addition of Na2CO3. The results show that the grade of TiO2 in the leached product of activated titania feedstock is over 90 %. Comparing activated titania feedstock with non-actirated titania feedstock, the TiO2 grade of the latter is improved by about 10% with dilute hydrochloric acid.