摘要
本文对酸性磷类-螯合-中性萃取剂三元协萃UO_2^(2+)进行了研究。萃取反应及萃取平衡常数可分别表示为 UO_2^(2+)+H_2A_(2(0))(?)UO_2A_(2(0))+2H^+ UO_2^(2+)+2H_2A_(2(0))(?)UO_2(HA_2)_(2(0))+2H^+ UO_2^(2+)+H_2A_(2(0))+B_((0))(?)UO_2A_2B_((0))+2H^+ UO_2^(2+)+2H_2A_(2(0))+B_((0))(?)UO_2(HA_2)_2B_((0))+2H^+ UO_2^(2+)+2HL_((0))+B_((0))(?)UO_2L_2B_((0))+2H^+ UO_2^(2+)+H_2A_(2(0))+HL_((0))+B_((0))(?)UO_2(HA_2)LB_((0))+2H^+ UO_2^(2+)+2H_2A_(2(0))+HL_((0))+B_((0))(?)UO_2(HA_2)(H_2A_2)LB_((0))
The synergistic extractions of uranium(Ⅵ) nitrate using P204(H_2A_2)r,PMBP(HL) and TBP(B) have been studied in benzene media. The extraction, reaetions and extraction equilibrium constants are fouud to be
UO^(2+)_2+H_2 A_(2(0)) K_(2000)=2.92 UO_2A_(2(0))+2H^+
UO^(2+)_2+H_2 A_(2(0)) K_2200=3.83×10~2 UO_2(HA_2)_(2(0))+2H^+
UO^(2+)_2+H_2 A_(2(0))+B_(0) K_2001=6.75×10~2 UO_2A_2B_(0)+2H^+
UO^(2+)_2+H_2 A_(2(0))+B_(0) K_2201=5.53×10~3 UO_2(HA_2)_2B_(0)+2H^+
UO^(2+)_2+2HL_(0)+B_(0) K_0021=1.86×10~4 UO_2L_2B_(0)+2H^+
UO^(2+)_2+2H_2A_(2(0))+HL_(0)+B_(0) K_1111=6.2×10~4 UO_2(HA_2) LB_(0)+2H^+
UO^(2+)_2+2H_2A_(2(0))+HL_(0)+B_(0) K_2211=2.3×10~6 UO_2(HA_2) (H_2A_2)LB_(0)+2H^+
respectively.
出处
《核科学与工程》
CAS
CSCD
北大核心
1990年第2期141-149,7-8,共9页
Nuclear Science and Engineering
