On precipitated calcium and magnesium phosphates during synthetic hard waters softening by monosodium phosphate

被引:6
作者
Manzola, A. S. [1 ]
Mgaidi, A. [2 ]
Laouali, M. S. [1 ]
El Maaoui, M. [2 ]
机构
[1] Univ Abdou Moumouni, Fac Sci, Lab Chim Analyt & Minerale, Niamey, Niger
[2] Univ Tunis, Fac Sci, Lab Chim Minerale Ind, Tunis 1002, Tunisia
关键词
Softening; Synthetic hard waters; Settling time; Calcium; Magnesium; Phosphates; Solid phases; OCTACALCIUM PHOSPHATE; CRYSTAL-GROWTH; CRYSTALLIZATION;
D O I
10.1080/19443994.2013.814000
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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.
引用
收藏
页码:4734 / 4744
页数:11
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