Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher

This work presents a grinding process of monoammonium phosphate (MAP) as an active component in powder fire extinguisher (PFE). The aim was to determine the time for reaching optimal particle size MAP necessary permanent extinguishing. performed by using laboratory ceramic ball mill and vibrating cup mill. controlled sieving 100 ?m sieve at precisely defined intervals. efficiency PFE depends on share -100 fraction component, which has exceed 60 %. grain with 64 % obtained after 33 min ?3000 mm (single-stage grinding). In two-stage process, same initial sample (?3000 ?m) vibro 10 min, upper limit 300 mean diameter 120 obtained. reduced further ground yielding 67.5 19 min. total 29 By analyzing required get lowest that provides effectiveness formed it can be concluded this single-stage grinding, while only 26 process. Thus, 7 indicating certain energy savings. Stability hydrophobicity were achieved coating magnesium stearate (MgSt) content 2 15 confirmed standardized procedure verification hydrophobic properties contact water drops. To had mass ratios MAP:AS:CC:QS:MgSt=55:20:18:5:2 (AS-ammonium sulfate; CC-calcium carbonate, QS-quartz sand) characterized chemical granulometric analyses. extinguishing tested conditions, whereby fires initiated burning solid materials flammable liquids. both cases, immediate elimination flames achieved, thus proving practical applications.