TnOA-H_2SO_4体系萃取Cr(Ⅵ)的研究

STUDIES ON THE EXTRACTION OF CHROMIUM BY TRI-N-OCTYLAMINE IN SULFURIC ACID SOLUTION

本文研究了TnOA-H2SO4体系萃取铬（Ⅵ），考察了酸度、被萃物、萃取剂与SO4(2-)浓度、萃取时间和温度等因素对萃取的影响。用饱和法、摩尔比法、等摩尔系列法和IR法联合确定苹合物的组成和萃取平衡机理，表明萃取过程属阴离于交换机理，揭示了Deptuta等对Cr（Ⅵ）的萃取型体的异论。

The extraction of chromium(Ⅵ)by tri-n-octylamine in sulfuric acid ha, been investigated. The effects of PH of the aqueous phase,total Cr(Ⅵ) and SO4(2-) Concentration, extractantconcentration, extractive time as well as temperature on this extraction process have been examied. The Composition of extracted compound has been determined by saturation methed, molarratio method, equimolar series method, as well as IR method. The extracted Cr(Ⅵ) Species andthe molar ration of to the CrO4(2-) and Cr2O7(2-) in the extracted Complexes have also been studied.An ion-exchange mechanism of extraction is discussed. Differing conclusions. of Deptuta et al.for the species in extracted Cr(Ⅵ) are clarified.