钒钛铁精矿常压盐酸浸出分离铁钛试验研究

在常压条件下,采用盐酸浸出法对钒钛铁精矿进行选择性浸出试验,研究了液固比、浸出温度、浸出时间和盐酸浓度对铁和二氧化钛浸出率的影响,并对浸出渣结构、形貌、粒度及元素分布进行了研究。结果表明,盐酸浸出过程破坏了钒钛铁精矿中的磁铁矿物相,浸出渣表面出现了较为明显的粉化现象,铁元素进入浸出液;而钛铁矿未被破坏,仍以钛铁矿的形式存在酸浸渣中。最优浸出条件为:液固比为9∶1,浸出时间为60 min,盐酸浓度为18.6%,浸出温度为85℃。最优条件下铁的浸出率为85.41%,二氧化钛的浸出率为7.22%;酸浸渣的产率为27%,Ti O2品位约为34%。

Experimental Study on Separation of Iron and Titanium from Vanadium-titanium Iron Concentrate by Hydrochloric Acid Leaching at Atmospheric Pressure

The elements of vanadium-titanium iron concentrate were selectively leached by hydrochloric acid at atmospheric pressure,and the effects of liquid-sohd ratio,leaching temperature and time,and hydrochloric acid concentration on the leaching rate of iron and titanium dioxide (TiO2) were studied.Furthermore,the microstructure,morphology,size and elements distribution of the leaching residue were also investigated.The results show that the magnetite phase is destroyed by hydrochloric acid leaching and obvious pulverization is discovered on the surface of leaching residue,with Fe entering into the leaching solution.However,the ilmenite phase has not been destroyed and still exists in the leaching residue.The optimal leaching conditions are as follows:18.6％ of hydrochloric acid concentration,leaching at 85 ℃ for 60 min,and 9∶ 1 of liquid-solid ratio.At the optimal conditions,the leaching ratio of Fe and TiO2 are 85.41％ and 7.22％,respectively.The yield of leaching residue is 27％ and the grade of TiO2 in the leaching residue is about 34％.