PREPARATION OF GRANULAR SODIUM TRIPOLYPHOSPHATE PRODUCTS FROM SCREEN UNDERSIZE SODIUM TRIPOLYPHOSPHATE PARTICLES

摘要

ABSTRACT:Screen undersize sodium tripolyphosphate (STPP)particles are compacted, milled and moisturized byadding a sufficient amount of water thereon to producea material containing on the average between about15% and about 35% by weight moisture. The moisturizedmaterial is calcined to a temperature within the rangeof from about 300 to about 600°C, to produce a granularSTPP product having a low friability, high absorptiv-ity, and a bulk density within the range of om about0.65 to about 0.87 g/cc.