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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Effect of Lix984N content on phase disengagement dynamics in copper-SX
LIU Xiao-rong(刘晓荣)1, QIU Guan-zhou(邱冠周)2,
HU Yue-hua(胡岳华)2, YANG Jun-he(杨俊和)1,JIN Ming-lin(金鸣林)1

1. Department of Materials, Shanghai Institute of Technology,
Shanghai 200233, China;
2. School of Resource Processing and Bioengineering,
Central South University, Changsha 410083, China

Abstract:Lix984N is intimately related to the dynamic characteristics of phase disengagement in copper solvent extraction because of its interfacial activity. With increasing Lix984N content, the phase disengagement time is prolonged and the mechanism dominating phase disengagement process transfers from sedimentation to coalescence. The rate of droplet coalescence is faster than that of droplet sedimentation in the dense dispersion band when the volume fraction of Lix984N is less than 3.0%. The former almost equaled to the latter at Lix984N content of 3.0% and finally becomes lower than the latter when the volume fraction of Lix984N is more than 3.0%. The relationship between the adhesion force of two equal droplets and physical properties of fluids is deduced, which explains that the change of physical properties of organic phase with Lix984N content can make droplet coalescence more difficult and phase disengagement slower.

 

Key words: copper solvent extraction; phase disengagement; hydroxyoxime; Lix984N; dynamics; interfacial activity; coalescence

ISSN 1672-7029
CN 43-1423/U

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