Effect of Ion Exchange on Dewatering Phosphate Clay Waste With Polyethylene Oxide.
Stanley-DA; Brown-PM; Scheiner-BJ
Proc Progress in the Dewatering of Fine Particles Conf Univ of Alabama, 1981 Apr; :14 pages
As part of its mission to provide technology to assure a continuing supply of minerals, the Bureau of Mines conducted research to obtain a better understanding of how clays are flocculated by polyethylene oxide (peo). The Bureau is presently developing a dewatering technique in which peo is used to flocculate phosphatic clay waste and the resulting flocs dewatered on static and rotary screens. During the field testing of this technique, a clay waste was encountered that could not be dewatered readily. Studies indicated that the clay contained trace amounts of sulfides and that a portion of the exchange ions on the clay were probably hydrogen ions. Replacement of the exchange ions with calcium ions and agitation of the clay to oxidize the sulfides reduced the peo requirements, which resulted in the clay being readily dewatered in both laboratory and large-scale field tests.
Proc. Progress in the Dewatering of Fine Particles Conf., Univ. of Alabama Apr. 1-2, 1981, 14 PP.