赤泥酸浸的试验研究

Experimental Investigation on Leaching Metals from Red mud

以HCl和H2 SO4 为浸出剂 ,对赤泥中各有价金属的浸出条件进行了较系统的试验研究。结果表明 ,先采取低浓度HCl浸出 ,残渣再用高浓度H2 SO4 分解的两段浸出方式为佳。一段浸取盐酸浓度为 6mol/L ,液固比L/S =4∶1,反应温度 5 0℃ ,反应时间 1h。Sc2 O3的浸出率大于 80 % ,TiO2 的浸出率为 1%左右。二段浸取硫酸浓度为 92 % ,酸渣比为 3∶1,熟化温度为 2 0 0℃ ,熟化时间为 1.5h。TiO2 的浸出率为 96.5 7%。

The paper studied the conditions of red mud`s leaching by HCl and H_2SO_4. It is an optimum method to leach red mud with acid twice. The first leaching condition is: 6mol/L HCl, the liquid-solid ratio of 4:1, temperature 50℃ and time 1h. The leaching rate of Sc_2O_3 is over 80%, and the leaching rate of TiO_2 is about 1%.The second leaching condition is: 92% H_2SO_4, the acid-sludge ratio of 3:1, temperature 200℃, time 1.5h.The leaching ate of TiO_2 is 96.57%.