氧化还原-盐酸浸出钛铁矿制备富钛料工艺研究

Research on Oxidization-reduction-hydrochloric Acid Leaching Process to Prepare Titanium-rich Material with Ilmenite

采用氧化还原-盐酸常压搅拌浸出法对钛铁矿进行选择性浸出,研究了氧化还原预处理对钛铁矿粒度、结构、表面形貌的影响,并考察了不同浸出条件对钛铁矿中Fe、Ti浸出率及浸出渣中Ti O_2品位的影响。结果表明,钛铁矿经过氧化还原后颗粒表面粗糙程度增加,粒径有所增大。采用1 000℃氧化1 h,800℃H2还原1 h的改性矿浸出,优化浸出条件为:液固比5∶1,盐酸浓度4 mol/L,反应温度90℃,浸出时间5 h。优化条件下Fe和Ti的浸出率分别为93.89%和3.28%,最终获得Ti O_2品位87.51%的富钛料,同时很好地保持了原矿的粒度。

The process of oxidization-reduction-hydrochloric acid leaching was adopted to selectively leach the ilmenite from Panxi area. The effect of oxidization-reduction pretreatment on the grain size, surface morphology and microstructure of the ilmenite, and the influence of leaching conditions on the leaching rate of Fe and Ti from the ilmenite, TiO2 content in the leaching residue were investigated in this paper. The results indicate that after oxidization and reduction both the surface roughness and grain size of the ilmenite increase. The optimum leaching conditions are as follows： 5 ： 1 of liquid-solid ratio, 4 mol/ L of hydrochloric acid concentration, 90℃ of leaching temperature for 5 h, with the ilmenite oxidized at 1 000 ℃ for 1 h and reduced at 800 ℃ for 1 h by hydrogen as raw materials for leaching. The leaching ratios of Fe and Ti under the optimal conditions are respectively 93.89% and 3.28%. The titanium-rich material with 87.51% TiO2 can be finally obtained with particle size of ilmenite well maintained.