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Title: The surface charge of KCl as influenced by crystal lattice defects

Abstract

Recently, nonequilibrium electrokinetic measurements using laser-Doppler electrophoresis were reported for alkali halides and the sign of their surface charge was thus determined. These results are generally as expected from simplified lattice ion hydration theory with KCl, under normal circumstances, being the most significant exception. In this regard, lattice defects (F centers and oxygen imperfections) have been found to influence the surface charge of KCl and its electrophoretic mobility. In particular, the presence of oxygen defect states in the crystal lattice has been found to be responsible for KCl's unexpected behavior. The concentration of oxygen defect states in KCl, as characterized by UV/Vis absorption, was varied in order to study their influence on the electrokinetic behavior and subsequently on the flotation response of KCl. At low oxygen contents (<60 ppm) KCl is positively charged as expected from lattice ion hydration theory. However, typically, KCl contains substantial oxygen (>300 ppm), sufficient to impart a negative surface charge and this accounts for the selective flotation of KCl from NaCl by heterocoagulation with oppositely charged alkyl amine hydrochloride collector colloids.

Authors:
;  [1]
  1. (Univ. of Utah, Salt Lake City, UT (United States). Dept. of Metallurgical Engineering)
Publication Date:
OSTI Identifier:
7205472
DOE Contract Number:  
FG03-93ER14315
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science; (United States)
Additional Journal Information:
Journal Volume: 163:1; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; POTASSIUM CHLORIDES; CRYSTAL DEFECTS; FLOTATION; SURFACE POTENTIAL; CORRELATIONS; ELECTROPHORESIS; ORE PROCESSING; ALKALI METAL COMPOUNDS; CHLORIDES; CHLORINE COMPOUNDS; CRYSTAL STRUCTURE; HALIDES; HALOGEN COMPOUNDS; POTASSIUM COMPOUNDS; POTENTIALS; PROCESSING; SEPARATION PROCESSES; 360602* - Other Materials- Structure & Phase Studies; 400201 - Chemical & Physicochemical Properties; 320303 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes

Citation Formats

Yalamanchili, M.R., and Miller, J.D. The surface charge of KCl as influenced by crystal lattice defects. United States: N. p., 1994. Web. doi:10.1006/jcis.1994.1089.
Yalamanchili, M.R., & Miller, J.D. The surface charge of KCl as influenced by crystal lattice defects. United States. doi:10.1006/jcis.1994.1089.
Yalamanchili, M.R., and Miller, J.D. Tue . "The surface charge of KCl as influenced by crystal lattice defects". United States. doi:10.1006/jcis.1994.1089.
@article{osti_7205472,
title = {The surface charge of KCl as influenced by crystal lattice defects},
author = {Yalamanchili, M.R. and Miller, J.D.},
abstractNote = {Recently, nonequilibrium electrokinetic measurements using laser-Doppler electrophoresis were reported for alkali halides and the sign of their surface charge was thus determined. These results are generally as expected from simplified lattice ion hydration theory with KCl, under normal circumstances, being the most significant exception. In this regard, lattice defects (F centers and oxygen imperfections) have been found to influence the surface charge of KCl and its electrophoretic mobility. In particular, the presence of oxygen defect states in the crystal lattice has been found to be responsible for KCl's unexpected behavior. The concentration of oxygen defect states in KCl, as characterized by UV/Vis absorption, was varied in order to study their influence on the electrokinetic behavior and subsequently on the flotation response of KCl. At low oxygen contents (<60 ppm) KCl is positively charged as expected from lattice ion hydration theory. However, typically, KCl contains substantial oxygen (>300 ppm), sufficient to impart a negative surface charge and this accounts for the selective flotation of KCl from NaCl by heterocoagulation with oppositely charged alkyl amine hydrochloride collector colloids.},
doi = {10.1006/jcis.1994.1089},
journal = {Journal of Colloid and Interface Science; (United States)},
issn = {0021-9797},
number = ,
volume = 163:1,
place = {United States},
year = {1994},
month = {3}
}