Green ball qualities are adversely affected by increased concentrations of
Ca++ and Mg++ in process waters because of the replacement of Na+ in bentonite by the
divalent cations through cation exchange reaction. Preliminary laboratory tests indicated
that displacement of interstitial plant water in filter cakes with RO. water restored ball
quality. A few preliminary pilot plant tests were performed to study the effect of
removing ca++ and Mg++ ions from filter cakes during filtration by spray washing with
softened water, and its effect on balling characteristics.
University of Minnesota Duluth, Natural Resources Research Institute, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; Coleraine Minerals Research Laboratory, One Gayley Avenue, Box 188, Coleraine, MN 55722
Role of Water Chemistry on Balling.
University of Minnesota Duluth.
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