含钛高炉渣制备富钛料的研究

Preparation of Rich-titanium Materials from Blast Furnace Slag Containing Titanium

攀枝花地区钒钛磁铁精矿经直接炼铁后,其中的钛几乎全部进入渣中,形成了TiO2含量达48.01%的高炉渣,高炉渣中的TiO2在直接炼铁过程中与MgO和Fe2O3等其它氧化物结合形成了复杂的钛酸盐化合物,常规酸浸法除杂效果不理想。实验采用加碱焙烧后,5%盐酸浸出的工艺制备富钛料,通过研究焙烧温度和碱添加比对浸出除杂的影响,实验结果表明高炉渣按50%的碱渣比和1 000℃条件下焙烧后浸出,浸出渣中TiO2品位达75.65%且大多留存在渣中。该工艺具有渣处理成本低、产生的废酸量少等突出优点,是综合利用含钛高炉渣的一个可行途径。

In Panzhihua area, vanadic titanomagnetite is used to prepare iron by directed reduction process, meanwhile, most of titanium formed 48.01% TiO2 contents blast furnace slag, where TiO2 combined with MgO and Fe2O3 formed complicated titanate compounds. Roasting temperature and alkali slag ratio have been tested to prepare rich-titanium materials. It has been found that the optimal conditions are： 1 000℃ of roasting temperature and 50% alkali slag ratio, under which TiO2 contents can reached to 75.65 % and most of them left in slag. The advantages to recover titanium by this process are the lower cost and smaller waste acid in dealing with the blast furnace slag.