Journal
DESALINATION AND WATER TREATMENT
Volume 52, Issue 25-27, Pages 4734-4744Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2013.814000
Keywords
Softening; Synthetic hard waters; Settling time; Calcium; Magnesium; Phosphates; Solid phases
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Phosphates were largely used to soften process or drinking waters. We have investigated the precipitation of Ca2+ and Mg2+ ions by monosodium phosphate dehydrate. Magnesium phosphate starts precipitating at pH(0) = 8.6. The obtained solids have been identified by chemistry analyses, FTIR spectroscopy, X-ray diffraction, thermo gravimetric analysis and differential thermal analysis. The solid phases obtained vary with pH0. It shows that DCPD (dicalcium phosphate dehydrate, CaHPO4 center dot 2H(2)O) precipitated within pH0 5 to 6.6, the TCP (tricalcic phosphate) and other apatite appear below pH(0) = 7. The DCPD (dicalcium phosphate dihydrate, CaHPO4 center dot 2H(2)O,) precipitated was a pure product that can be used in nanotechnology and biomedical technology. We are presently testing these solids for natural waters defluoridation.
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