Subsidence of suspensions of phosphatic slime and its major constituents |
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| Authors: | DR Nagaraj L McAllister P Somasundaran |
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| Institution: | Henry Krumb School of Mines, Columbia University, New York, N.Y. 10027 U.S.A. |
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| Abstract: | The dewatering of stable phosphatic clay suspensions resulting from the processing of phosphate rock is a problem of much practical and theoretical significance. In order to investigàte this aspect, the sedimentation behavior of suspensions of major components of phosphatic slimes, or morphologically similar meterials, both separately and in appropriate combinations, was studied. Systems which behaved very similarly to phosphatic slimes were termed “model systems”. Study of these model systems revealed that the minerals montmorillonite and attapulgite, with their special properties — morphology, swelling, ion exchange capacity, surface charge, and viscosity — were responsible for the behavior of phosphatic slimes.Mechanisms by which coarse particles and micro air bubbles enhance the dewatering of the phosphatic slimes are reviewed. In both cases, creation of paths for water seepage as a result of their movement is considered to be mainly responsible for the enhanced subsidence of the slurry. |
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