Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 2    No. 4    November 1992

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Ma Yun, Zhu Tun

Institute of Chemical Metallurgy, Academia Sinica, Beijing 100080, China

Abstract:The kinetics  of solvent,extraction of aluminum  with di-2-ethylhexyl phosphoric acid  (DEHPA) in n-heptane have been studied in a constant interfacial area cell. A HCl-KHC8H404 (potassium biphthalate> KHL) buffer solution was used to maintain a constant pH during extraction. The effects of the concentration of aluminum, pH,the concentration of the extractant, the interfacial area and the temperature on the extraction rate were investigated. A method has been invented to determine amont of the extracted aluminum in the organic phase with 8-hydroxyquinoline. Aased on calculation of the coordination states of the aluminum ions and their contribution to the reaction rate, a raaction mechanism which includes two main reaction paths, has been proposed to describe the process. One path starts from Al(H2O)63+,and the other starts from Al(H2O)4L+. The reaction could take place both in the aqueous phase and at the interface. The main reaction region could be changed as the conditions of extraction were changed. When [HA] < 0.03 mol / L the process was controlled by the interfacial reaclion, and when [HA]>0.03 mol / L it was shifted to a homogeneous aqueous solution reaction.


Key words: aluminum  solvent extraction  kinetics  constant interfacial area cell  di-2-ethylhexyl phosphoric acid.

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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