Performance of Extraction of Zn(II) with Sec-octylphenoxy Acetic Acid
仲辛基苯氧乙酸萃取Zn(II)的性能

The extraction performance of Zn(II) from HCl medium with a new kind of carboxylic extractant, ammonized sec-octylphenoxy acetic (CA12) and ammonization of the extractant have been studied. The influence of extraction temperature, initial concentration of extractant, etc. on the extraction is examined. The results show that the best conditions for ammonization of CA12 with NH3.H2O are NaCl concentration of 1.0 mol/L in diluted NH3.H2O and ammonization ratio up to 80%. Distribution ratio D rises along with the decrease of equilibrium acidity and the increase of initial concentration of the extractant. The slope of lgDpH curve is about 2. 0.01 mol/L Zn(II) is almost extracted completely from HCl medium under the condition of initial pH=6.0~6.5 and initial extractant concentration CHA>0.10 mol/L. The value of DH of the process was calculated to be 3.28 kJ/mol.