Explosion hazards and fire risk
for vibration, shock or friction is not sensitive , not to spontaneous combustion performance . Therefore, the use and production of ammonium nitrate , just to comply with certain safety regulations , in general, is relatively safe .
Explosive ammonium nitrate is mainly caused by the following reasons :
( 1 ) thermal decomposition of pure ammonium nitrate ;
( 2 ) the intense enough fuze ;
( 3 ) thermal decomposition of organic substances when present ;
( 4 ) and some inorganic impurities Effect of metal powder.
Thermal decomposition of ammonium nitrate : heated continuously at 110 ℃, pure ammonium nitrate ,
the decomposition of the following formula : NH4NO3 = HNO3 + NH3-41300 Card belong to the thermal effect of the solid salt . Molten nitrate decomposition process endothermic 37.0 kcal. When at 185 ~ 200 ℃ decomposed, nitrous oxide and water : NH4NO3 = N2O +2 H2O +30300 card
or more from the start temperature of 230 ℃ , decomposition speed, while a weak flash to occur. At this point the following formula is decomposed into nitrogen and oxygen : 2NH4NO3 = 2N2 + O2 +4 H2O when ammonium nitrate ( gas ) +30700 card in a molten state here type decomposition heat release is 35 kcal. If at this time the decomposition is carried out in a fixed accommodate , then the temperature and pressure of up to 550 ℃ and 4500 kg / cm 2 . In the case of rapid heating , the reaction can also be carried out by the following formula : 2NH4NO3 = 2NO + N2 +4 H2O ammonium nitrate + 9200 cards in a molten state heat release is 13.0 kcal. 33.5 kcal exothermic when 4NH4NO3 = 3N2 +2 NO2 +8 H2O +29500 card ( 5 ) molten nitrate decomposition formula here : When the temperature is higher than 400 ℃, according to the following reaction formula decomposition and exploded . May also occur at this temperature the following reaction : 3NH4NO3 = N2O3 +2 N2 + 6H2O ( gas ) +23300 card ( 6 )
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