Magnesium phosphate-tetrahydrate

Oxides with group 13-15 elements (B, Al, Sn, As) cobalt aluminium oxide cobalt boron oxide (cobalt borate) cobalt tin oxide (cobalt stannate) cobalt arsenic oxide (cobalt arsenate) eobalt arsenic oxide hydrate and erythrite (Co3(As04)2.8H20) cobalt ammonium arsenic oxide smaltite ((Co,Ni)As3 n). Phosphates cobalt phosphate (Co3(P04)2) cobalt phosphate tetrahydrate Co3(P04)3.4H20 cobalt phosphate octahydrate Co3(P04)2.8H20 cobalt aluminium phosphate cobalt ammonium phosphate (C0NH4PO4.H2O) cobalt magnesium phosphate cobalt zinc phosphate. 

The reaction is exothermic, which occurs with the loss of some ammonia, and can be retarded by the addition of borax or sodium tripolyphosphate (STPP). The reactions described by Abdelrazig et al. (1988 and 1989). show that the solution of ADP in water forms ammonium and phosphate ions immediately, which react with the magnesium oxide particles in suspension. At the initial stages of the reaction, when phosphate concentration is at its highest, the intermediate tetrahydrate schertelite is formed. As the... 

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