Stepwise Chlorination-Chemical Vapor Transport Reactions for Bastnaesite Concentrate  

作　　者：张丽清 王军 范世华 雷鹏翔 王之昌 

出　　处：《Journal of Rare Earths》2002年第1期56-60,共5页稀土学报（英文版）

基　　金：theNationalNaturalScienceFoundationofChina ( 5 98740 0 8)

摘　　要：Vapor phase extraction and mutual separation of rare earth (RE) elements from bastnaesite concentrate were investigated using stepwise chlorination chemical vapor transport reactions mediated by vapor complexes LnAl n Cl 3 n +3 (Ln=RE elements). The bastnaesite was heated to 800 K and chlorinated between 800～1300 K with C+Cl 2+SiCl 4 to remove CO 2, SiF 4 and high volatile chlorides. At the temperature of 1300 K for 6 h, the resulted RE chlorides were chemically transported and mutual separated with the vapor complexes while CaCl 2 and BaCl 2 were remained in the residues. Significantly different CVT characteristics were observed for gradually decreased and wave form temperature gradients.Vapor phase extraction and mutual separation of rare earth (RE) elements from bastnaesite concentrate were investigated using stepwise chlorination chemical vapor transport reactions mediated by vapor complexes LnAl n Cl 3 n +3 (Ln=RE elements). The bastnaesite was heated to 800 K and chlorinated between 800～1300 K with C+Cl 2+SiCl 4 to remove CO 2, SiF 4 and high volatile chlorides. At the temperature of 1300 K for 6 h, the resulted RE chlorides were chemically transported and mutual separated with the vapor complexes while CaCl 2 and BaCl 2 were remained in the residues. Significantly different CVT characteristics were observed for gradually decreased and wave form temperature gradients.

关 键 词：rare earths bastnaesite concentrate chemical vapor transport RE vapor complexes LnAl    n  Cl    3  n  +3 

分 类 号：TQ028[化学工程]