萃取Fe^(3+)和氨水-乙醇反萃沉淀法制备α-Fe_2O_3

Extraction of Fe^(3+) by Bi-(2-ethylhexyl)phosphate and Preparation of α-Fe_2O_3 by Stripping Precipitation Method with Ammonia-alcohol

以磷酸二异辛基酯(P204)为萃取剂,CCl4为溶剂,从Fe(NO3)2水溶液中萃取铁离子,以氨的乙醇溶液反萃含铁的有机相,通过优化控制相间传质过程,获得了Fe(OH)3前驱体,经煅烧后得α-Fe2O3粉体,采用TEM、FTIR、XRD等测试技术对α-Fe2O3进行表征。研究表明,在油水相比为1∶1,水相c(Fe3+)=0.10 mol/L(pH=3.0)、油相P204为V(P204)∶V(CCl4)=1∶3、平衡时间为20 min,Fe3+萃取率达98.44%;反萃取溶液V(氨水)∶V(乙醇)=1∶7、陈化温度约10.0℃,制备纳米α-Fe2O3的煅烧温度为600℃较宜。

Fe3＋ was extracted from Fe（NO3）3 by liquid phase extraction using a mixture of bi-（2-ethylhexyl） phosphate（P204） and tetrachloride carbon.Fe（OH）3 powders were prepared through stripping precipitation method with ammonia-alcohol aqueous solution as a re-extractant and precipitator.α-Fe2O3 powders were obtained by decomposing Fe（OH）3 at an appropriate temperature and characterized by TEM,FTIR,and XRD.The results show that the P204 contents are in the oil phase,Fe3＋ contents are in the water phase,and the reaction time has obvious influence on the extraction of Fe3＋.Under the optimum conditions of phase volume ratio at 1∶ 1,c（Fe3＋） at 0.10 mol/L（pH=3.0）,volume ratio of P204 and CCl4 as 1∶ 3,and reaction time of 20 min,98.44% of Fe3＋ is extracted.α-Fe2O3 powders with a small size and uniformity are obtained at 600 ℃.The optimum aging temperature and concentration of ammonia aqueous are 10.0 ℃ and 1∶ 7,respectively.