Extraction kinetics of zinc by new extractant in ammoniacal system

作     者：HUANG Ling HE Jing CHEN Yong-ming YANG Sheng-hai JIN Sheng-ming TANG Mo-tang 

作者机构：School of Metallurgical Science and Engineering Central South University Changsha 410083 China Guangzhou Research Institute of Non-ferrous Metals Guangzhou 510000 China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2013年第20卷第7期

页      面：1797-1804页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：Foundation item: Project(51174240) supported by the National Natural Science Foundation of China Project(2006BA02B04-4-2) supported by the National Eleventh Five-Year Research Program of China Project(20100908) supported by Scientific and Industrial Research Organisation of Guangdong Province, China 

主　　题：solvent extraction zinc 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester kinetics 

摘      要：The controlling step and the extraction reaction rate equation of zinc extraction from Zn（II）-NH3 solution by using a newly synthesized organic compound, 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester as the zinc extractant, were clarified. The effects of agitation speed, specific interfacial area, temperature, extractant concentration and Zn ion concentration on the extraction rate are studied in constant interfacial area cell. The results show that the extraction rate depends on interfacial chemical reaction and diffusion by using this new extraetant to extract zinc, and the apparent activation energy of this extraction reaction is measured as 28.2 kJ/mol, which demonstrates that the extraction reaction is controlled by the mixed-controlled reaction rate. The apparent reaction orders a and b are measured as 1 and 0.38, and the constant k0 is 138.70. So, when extraction conditions are controlled as [HR]=20%-50%, T=0-30℃, N=120-177 r/min and S=72.6-127.5 m-1, the solvent extraction reaction rate can be depicted as v/（mol . m-2 . s-1 ） = 138.7. exp（ - 28 206/8.314T ）. [Zn 2＋ ]r ·[HR ]o0.38.