水淬含钛高炉渣的盐酸浸取研究

Leaching of Water Quenched Titanium-bearing Blast Furnace Slag in Hydrochloric Acid

钛铁矿经过高炉炼铁以后,大量的钛进入炉渣中。为了对水淬含钛高炉渣中的Ti进行回收利用,采用盐酸法对高炉渣常压下浸取提钛。试验结果表明,浸取过程中,高炉渣中大量的Ca、Mg、Al、Ti进入到液相中;在试验考察的影响因素中,原料粒度对浸出率没有影响,而盐酸浓度、反应时间、反应温度、液固比都对浸出率有较大影响;得到其最佳浸取条件为:反应时间120 min、盐酸浓度大于30%、反应温度90℃、液固比7.5∶1以上。在该条件下,Ti的浸出率可以达到90%以上。

Following ironmaking process in BF, a great deal of titanium is brought from iron conentrate into slag. In order to recycle the titanium in water-quenched Ti-bearing blast furnace slag, hydrochloric acid is used in the leaching process. Possible influencing factors on leaching rate are investigated. The result indicates that a large amount of Ca, Mg, Al and Ti dissolves in hydrochloric acid solution in leaching process. Among the potential influencing factors investigated in experiments, raw materials size has no influence on Ti leaching rate, while hydrochloric acid concentration, reaction time, reaction temperature and ratio of liquid over solid have a pronounced impact on it. The optimum leaching conditions are thus obtained as follows： concentration of hydrochloric acid of 30% above, residence time for 120 rain, ratio of liquid over solid of 7.5 above, and temperature at 90℃. Under the optimum leaching eonditions, the leaching rate of titanium can reach 90% above.