Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 35, Issue 3, Pages 395-410Publisher
MARCEL DEKKER INC
DOI: 10.1081/SS-100100164
Keywords
solid liquid separation; filtration; dihydrate process; phosphogypsum; size distribution; surfactant
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A nonionic surfactant (CMR-100) containing a mixture of C-6-C-22 sorbitan esters was tested to improve the filtration rate of phosphogypsum produced from a South Florida phosphate concentrate at different sulfate levels. Tests were carried out on a lab-scale under operating conditions that simulate, to a large extent, the industrial parameters. It was found that the mean diameter of the formed crystals was increased by addition of the surfactant. Equally important, a narrower size distribution was obtained as compared to that in the absence of the surfactant. A significant increase (23 to 31%) in filtration rate, expressed as tons P2O5/m(2).day, was achieved due to the surfactant's addition. A correlation between crystal size distribution of phosphogypsum and filtration rate is presented in this paper.
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