Ammonium Dihydrogen Phosphate ADP

Those based on the reaction between magnesium oxide and ammonium dihydrogen phosphate (ADP), often in the presence of sodium tripolyphosphate (STPP), which is mixed with water (El-Jazairi, 1982 Abdelrazigeta/., 1984 Abdelrazig, Sharp El-Jazairi, 1988, 1989). 

The reaction between MgO and ammonium dihydrogen phosphate (ADP) in aqueous solution yields struvite, MgNH4P04. bHjO, and schertelite, Mg(NH4)2(HP04)2.4H2O, as the main reaction products. Both may be regarded as cementing species. Only minor amounts of MgO are consumed during these reactions as it is present in excess. The reaction is exothermic. Sodium tripolyphosphate (STPP) or borax may be added to retard the reaction. The main course of the reactions may be represented thus ... 

The use of urea is well documented in the literature [74, 75], as well as the effect of phosphorus-based FRs is strongly affected by the presence of metals [47,49-51,53-56, 62,74-76]. As an example, Gao et al. [76] have recently investigated complexes of cellu-lose-THPC-urea-ammonium dihydrogen phosphate (ADP) with transition metal ion Co and lanthanide metal ions such as La , Ce , Nd and Sm . The experimental data from TG, DTA, DTG and cone calorimetry tests have shown that for the complexes of cellulose-THPC-urea-ADP with the metal ions, the activation energies and thermal decomposition temperatures are higher than those of cellulose-THPC-urea-ADP this finding demonstrates that these metal ions can increase the thermal stability of cellulose-THPC-urea-ADP. Furthermore, these lanthanide metal ions can further increase the thermal stability of samples, unlike the transition metal ion Co . 

---