22 64 306 7 has a particularly favorable effect on the stabilization of ammonium nitrate in particular it is superior to the use of orthophosphate compare also the table since ammonium polyphosphate under some circumstances has a tendency to hydrolyze in the presence of water it is expedient to add this salt only after the major part of the water has evaporated this is usually the case when the ammonium nitrate melt has reached the maximum of the concentration i e in the sump of the concentration evaporator of course any point between this concentration evaporator and the apparatus which is used for molding can be used if the dosage is exact and if the melt has sufficiently homogenized prior to molding the polyphosphates which are not endangered by hydrolysis can under certain circumstances already be added during neutralization or prior or during the evaporation of the ammonium nitrate in the case of this group of materials one can use concentrated solutions of these salts for example also initial products of the preparation or also one can add the slid salt ammonium polyphosphate should either be added as melt or also in solid form for the molding of the ammonium nitrate stabilized in this manner the customary technical methods such as crystalization granulation atomization etc can be used especially preferred is the prilling technique as prilling devices can be used the customary technologized apparatus nozzles rotation bodies etc the use of polyphosphates has numerous advantages as compared to.