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Free water in phosphogypsum

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Abstract

Phosphogypsum, which is a by-product in the manufacture of phosphoric acid from phosphate rock, exhibits a partial loss of water of hydration at temperatures above 60°C as the calcium sulfate converts from the dihydrate to the hemihydrate and ultimately to the anhydrate. However, drying at a lower temperature requires about five days to determine the free water content. Alternative methods will provide more timely values of free water.

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References

  1. Official Methods of Analysis (1984) 14th Ed., Association of Official Analytical Chemists, Arlington, VA, sec 2.015

  2. Methods Used and Adopted by the Association of Florida Phosphate Chemists (1980) 6th Ed, Bartow, FL, Section XI, 2C

  3. Ardaman & Associates, IMC Fertilizer, Inc. File Number 81-018A/C, sec 7.3.1

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Authors and Affiliations

  1. Quality Control Laboratory, IMC Fertilizer, Inc., New Wales Operations, P.O. Box 1035, 33860, Mulberry, FL, USA

    D. W. Averitt & J. E. Gliksman

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  1. D. W. Averitt
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  2. J. E. Gliksman
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Averitt, D.W., Gliksman, J.E. Free water in phosphogypsum. Fertilizer Research 24, 57–62 (1990). https://doi.org/10.1007/BF01073147

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  • DOI: https://doi.org/10.1007/BF01073147

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