Crystallization of struvite in a hydrothermal solution with and without calcium and carbonate ions

摘要: Abstract Hydrothermal experiments with magnesium, ammonium, and phosphate (MAP) solution at a temperature of 120 OC for 24 h pH (9 10), whilst effects varying Mg2+/Ca2+/HCO−3 ratios on struvite crystallization were examined. The study was performed to investigate their the quality quantity crystals using XRPD Rietveld refinement SEM method. Obviously, inhibited through forming calcite, dolomite, hydroxyapatite, sylvite, Mg-whitlockite under different conditions. In absence Ca2+ HCO−3 ions, dittmarite formed solutions 10). Struvite proportion reduced 10) (1:1:1 2:1:1), depleted ratio 1:2:2. An obvious change in morphologies into nanosized particles observed. Results low molar may be drawback recovery.