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以钒钛磁铁矿深还原渣为原料采用硫酸法生产出了TiO2含量大于99.2%的金红石型钛白粉,主要研究了不同酸矿比、酸浓度对酸解率的影响并对酸解率较低的原因进行了分析,以找出直接还原渣硫酸浸出法的最优条件。结果表明,酸解率随着酸矿比的增加而提高,但当酸矿比高于1.65时,酸解率提高不够明显,酸解率可达到75%左右,比同样品位的钛铁矿(TiO2含量为46%-47%)酸解率低5%左右;而影响直接还原渣酸解率的原因与其中铁、镁元素的含量低有关,为了提高直接还原渣的酸解率同时又不增加除铁工序,须按一定比例混入钛铁矿。
The vanadium titanomagnetite deep reduction slag was used as raw material to produce rutile titanium dioxide with the content of TiO2 greater than 99.2% by sulfuric acid method. The effects of acid to mineral ratio and acid concentration on the acid hydrolysis rate were studied. The reason for the low was analyzed to find out the optimal conditions for direct reduction of sulfuric acid leaching method. The results showed that the acid hydrolysis rate increased with the increase of acid to mineral ratio. However, when the acid to mineral ratio was above 1.65, the increase of acid hydrolysis rate was not obvious. The acid hydrolysis rate could reach about 75% The content of TiO2 is 46% -47%), the acid hydrolysis rate is about 5% lower. The reason of affecting the rate of direct reduction of slag is related to the low content of iron and magnesium. In order to increase the acid hydrolysis rate of direct reduction slag Iron removal process, according to a certain percentage of mixed ilmenite.