某些氟化物的升华提纯  

Purification of Some Fluorides by Sublimation

作　　者：余尧楚[1] 胡和方[1] 潘璋敏[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海大学材料系

出　　处：《无机材料学报》1995年第3期337-350,共14页Journal of Inorganic Materials

摘　　要：ＡＩＦ３在１１００℃升华时，因其蒸汽压和过渡金属氟化物杂质相近，升华分离比较困难，本工作采用较快速度升温和移动凝华区的办法，能满意地把带红棕色的ＦｅＦ３、ＣｕＦ２等杂质分离，得到含铁量＜１ｐｐｍ的无色ＡｌＦ３晶体．对ＢａＦ２、ＬａＦ３等高沸点氟化物原料，在１３５０℃升华时，能有效地除去过渡金属氟化物杂质．在氟化物玻璃中，存在Ｆｅ２＋Ｆｅ３＋的平衡，其中Ｆｅ３＋从可见区到近红外区，几乎没有吸收，因而可以用氧化Ｆｅ２＋成Ｆｅ３＋的方法，消除铁的吸收．While sublimation of AlF3 at 1100℃, the vapour pressure of AlF3 near by the one of fluoride impurities of trasition metal makes sublimating have slightly difficulty. The work adopts the ways that temperature is more speedily rising and solidification zone is a little moved into high temperature zone.Red-brown impurities that are mainly FeF3 and CuF2 can be separated from AlF3, and finally the Fe content of the colourless AlF3 crystal is less than lppm. Some fiuoride materials with high boiling point such as BaF2 and LaF3, when they are sublimated at 1350℃, can effectivelly remove fluoride impruities of transition metal. In fiuoride glasses can exist the equilibrium of Fe2+ Fe3+. Since absorption of Fe3+ is too weak to present absorption from visible to near infrared, so that may employ the way, which oxidating Fe2+ to Fe3+ makes absorption of Fe eliminated.

关 键 词：升华 氟化物 提纯 氟化铝 玻璃 

分 类 号：TQ171.716[化学工程—玻璃工业]