Abstract
(1) The relation between the pH and the N/P (atomic ratio) of various ammonium phosphate solutions of concentration 2, 1,…1/8, 1/16 M/lwas studied.
When the N/P was, for instance, in the range of 1.2-1.4 (adequate range for synthesis), the pH of the solution was as follows:
in 1 M/lsolution 5.6-6.1
in 1/8 M/lsolution 6.1-6.5
The influence of temperature was negligible at 15-35°C in the range of 1.1-1.5 of the N/P.
(2) A series of syntheses using ammonium phosphate solution of 1/4 M/land N/P 1.2 were carried out by changing the reaction time between 5 minutes and 60 minutes for the purpose of investigating its influence.
The result of chemical analysis of the synthetic products showed that the reaction time had little influence on the component of the products.
This was due to the fact that as soon as the particles of magnesium hydroxide were added to ammonium phosphate solution, they turned into magnesium ammonium phosphate in a moment with the core unchanged, and then grew larger by aggregating with each other.
