THE FORMATION OF ALITE PHASE BY USING PHOSPHOGYPSUM AND OIL SHALE

Phosphogypsum is an industrial by-product for which alternatives for utilization have been sought. This article reports on a study that uses phosphogypsum (PG) and oil shale (OS) as raw materials for cement clinker production. The raw mixtures (Raw Mixes I and II) were burnt in a muffle furnace and then analyzed by X-ray diffraction (XRD) to observe the phases obtained. Minor amounts of alite (C3S) and major amounts of anhydrite phases were observed with the Raw Mix I containing 40.72% PG refined with water and lime wash by two and three times, respectively (PGR23), in N2 atmosphere at 1300 deg C. Minor amounts of alite (C3S), free CaO and major amounts of anhydrite phases were formed in air atmosphere at 1300 deg C with the Raw Mix II containing 40.72% PG refined with water and lime wash by three and four times, respectively (PGR34). The change of burning medium and the increase in the number of wash with water and lime, respectively, resulted in any difference in terms of the formation of the alite peaks. However, the intensity and the amount of anhydrite peaks were decreased in N2 atmosphere compared to that in air atmosphere. The authors conclude from their findings that the PG and OS can be used as constituents of raw mixes to form clinker phases of Portland cement (PC).

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    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Ozturk, A K
    • Oguz, H
  • Publication Date: 2004-11

Language

  • English

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  • Accession Number: 00986440
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 8 2005 12:00AM