APPLICATION OF EXTENDED DLVO THEORY .1. STABILITY OF RUTILE SUSPENSIONS

被引:151
作者
YOTSUMOTO, H [1 ]
YOON, RH [1 ]
机构
[1] VIRGINIA POLYTECH INST & STATE UNIV,CTR COAL & MINERALS PROC,BLACKSBURG,VA 24061
关键词
D O I
10.1006/jcis.1993.1205
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The DLVO theory has been used successfully to describe the stability of synthetic rutile suspensions in NaCl solutions of 2 × 10-3M and below. At higher concentrations, the suspension is more stable than predicted by the theory. At concentrations above 1 M, the suspension is redispersed even at its IEP. It is believed that the additional stability is due to the secondary hydration force associated with the hydrated counter ions adsorbed on rutile. In order to account for the increased stability of the rutile suspension in high electrolyte concentrations, the DLVO theory has been extended by including a hydration energy term. The hydration energy can be described by a double-exponential function, the parameters of which have been determined based on turbidity measurements. © 1993 Academic Press, Inc.
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页码:426 / 433
页数:8
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