NDLI: Electrostatic Charges on Clays

Content Provider	IEEE Xplore Digital Library
Author	Inculet, Ion I. Quigley, Robert M. Beisser, Ernest M. J.
Copyright Year	1972
Abstract	Cation charges present on the surfaces of clay minerals are expected to play a major role in industrial processes involving dry electrostatic separation of granular mixtures containing clay particles. A recent promising potential application has been the removal of clay from British Columbia pulverized coals prior to burning. The clay minerals kaolinite and montmorillonite form the main component of the ash in most Canadian coals: kaolinite is eastern coals and montmorillonite in western coals. The electric charges present on the surfaces of the clay mineral kaolinite have been analyzed from an application point of view, namely, for their ability to transfer onto and remain on other surfaces after contact and separation. Kaolinite samples homoionized with calcium and sodium were prepared from natural kaolin, and the charge transfer after contact and separation with coal was compared for various dry densities of the kaolinite. The results show the following. 1) The electric charge transfer from calcium kaolinite is substantially larger than that from both the sodium kaolinite and natural kaolinite. Charge transfer from untreated montmorillonite exceeds that from all kaolinite samples. 2) The charge transfer after 100 contacts is inversely proportional to the dry density of the clay on a semilog scale. The phenomenon is believed to be related to the changes which occur in the total contact area and in the electrical conductivity of the clay.
Sponsorship	IEEE Industry Applications Society
Starting Page	23
Ending Page	25
Page Count	3
File Size	1407892
File Format	PDF
ISSN	00939994
Volume Number	IA-21
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrostatics Charge transfer Calcium Conducting materials Minerals Contacts Crystalline materials Semiconductor materials Insulation Industry Applications Society
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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