We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effects of calcium monohydrogenphosphate on the morphology of calcium sulfate whisker by hydrothermal synthesis.
- Authors
Lü, Pengfei; Fei, Dejun; Dang, Yagu
- Abstract
In this paper, the factors related to the morphology of calcium sulfate whisker (CSW) are discussed. Most attention was devoted to the influence of co-crystallized phosphorus in phosphogypsum-existing in the form of CaHPO4 · 2H2O-on the crystal growth, which was ignored in the preparation of CSW from phosphogypsum in previous research. Methods including X-ray powder diffraction and scanning electron microscopy were performed to characterize the resultant crystals. The CSWs with uniform morphology were prepared by hydrothermal synthesis with commercial CaSO4 · 2H2O. However, the productions from the pretreatment phosphogypsum by hydrothermal synthesis appeared as irregular crystals with a small length to width ratio, and whisk-broom-like crystals were common. The influence of CaHPO4 · 2H2O on the growth of CSW has also been studied. The results showed that CaHPO4 · 2H2O can promote the formation of needle-like crystals and whisk-broom-like crystals at hydration condition. In order to improve the morphology of CSW in a CaSO4 · 2H2O-CaHPO4 · 2H2O system, substantive condition experiments were carried out, and it finally revealed that Fe3+ was useful for the well-developed CSW.
- Subjects
CALCIUM sulfate; PHOSPHOGYPSUM; CRYSTAL growth; X-ray powder diffraction; SCANNING electron microscopy
- Publication
Canadian Journal of Chemical Engineering, 2014, Vol 92, Issue 10, p1709
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.22037