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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%。
Under normal pressure, the leaching process of vanadium-titanium-iron ore was carried out by hydrochloric acid leaching method. The effects of liquid-solid ratio, leaching temperature, leaching time and hydrochloric acid concentration on leaching rate of iron and titanium dioxide were studied. Morphology, particle size and elemental distribution were studied. The results show that the hydrochloric acid leaching process destroys the magnetite phase in the vanadium-titanium-iron concentrate and the surface of the leached residue is obviously pulverized. The iron element enters the leachate. However, the ilmenite is still intact, In the form of acid leaching residue. The optimal leaching conditions were: liquid-solid ratio of 9:1, leaching time of 60 min, hydrochloric acid concentration of 18.6% and leaching temperature of 85 ℃. Under optimal conditions, the leaching rate of iron was 85.41%, the leaching rate of titanium dioxide was 7.22%, the acid leaching residue was 27%, and the Ti O2 level was about 34%.