四川某黏土矿中钪和钛的焙烧浸出试验研究

以四川某地含钪、钛、稀土黏土矿为研究对象,进行钠盐焙烧-酸浸、直接酸浸、硫酸化焙烧-水浸、空白焙烧-酸浸探索试验。结果表明,直接酸浸、空白焙烧-酸浸对钪和钛的回收效果均不好。硫酸化焙烧-水浸对钛的回收效果很好,但钪的浸出率较低。钠盐焙烧-酸浸试验结果表明,适宜的焙烧条件为:碳酸钠用量80%,焙烧温度800℃,焙烧时间1h；适宜的浸出条件为:10v.%硫酸,液固比20:1,浸出温度60℃,搅拌浸出时间2h；钪的浸出率为89.98%,钛的浸出率为80.55%。液固比对钪和钛的浸出率有显著影响,增大液固比可以暂时解决硅酸造成的过滤困难的问题。 

Experimental study on roast-leaching of scandium and titanium from a clay mine in Sichuan

For the scandium-, titanium- and rare earths-bearing clay ore from southern Sichuan, preliminary experiments of sodium salt roasting-acid leaching, direct leaching, sulfatizing roasting-water leaching, and blank roasting-acid leaching were conducted. Results showed that the recovery of scandium and titanium by direct leaching and and blank roasting-acid leaching was unsatisfactory. The recovery of titanium by sulfatizing roasting-water leaching was high, but the recovery of scandium was relatively low. Experiment results of sodium salt roasting-acid leaching showed that under roasting conditions of Na2CO3 dosage 80%, roasting temperature 800^oC, roasting time 1h, and under leaching conditions of sulfuric acid concentration 10 vol. %, liquid to solid ratio 20:1, leaching temperature 60^oC, agitation leaching time 2h, the leaching rates of scandium and titanium were 89.98% and 80.55%, respectively. Liquid to solid ratio has a significant effect on the leaching rates of scandium and titanium, and increasing liquid to solid ratio can temporarily solve the poor filterability problem caused by silicic acid.