(中南大学 冶金科学与工程学院，长沙410083)
摘 要:
关键字: 氧化锌矿；Zn(Ⅱ)-NH3体系；溶剂萃取；2−乙酰基−3−氧代−二硫代丁酸−十四烷基酯
Zn(Ⅱ)-NH3 complex system by new extractant YORS
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:In order to enrich the zinc concentration in ammoniacal leaching solution of low grade of zinc oxide ores, 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester, a new extractant, named as YORS, was used to extract zinc ion from Zn(II)-NH3 solutions. The results show that the average extraction ratio of zinc is larger than 97% and the distribution ratio of zinc can reach 41.74 under the following optimum conditions: organic phase composition 50%YORS+45%H (diluent)+5%P (additive), phase ratio V(A)/V(O) =2:1, temperature 298.15 K, agitation time 5 min, total ammonium concentration 2 mol/L, initial pH value 9~11. YORS extractant and loaded organic phase was characterized by FTIR and UV spectra to determine their molecular structures, respectively. It is demonstrated that the β-diketone of YORS reacts with free bivalent zinc ion to form coordination compound during zinc solvent extraction, but zinc ammine complexes are not co-extracted.
Key words: zinc oxide ores; Zn(Ⅱ)-NH3 system; solvent extraction; 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester
