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The main characteristics of Ammonium nitrate

The main characteristics

The soluble in water, soluble in water, easy absorption during moisture absorption and agglomeration, products are generally made of ammonium nitrate

Granular. Ammonium nitrate has 5 crystalline phases: the codenamed alpha (the system), β (orthorhombic), gamma (orthorhombic), δ (tetragonal), e (affirmative system). Each crystal is stable only in certain range of temperature, phase transformation is accompanied by thermal effect and volume change. Especially when the environment temperature of 32.1 ° C fluctuation, granular ammonium nitrate will its fragmentation into powder and cause. There are several anti-caking methods. For example: you can add about 1% in ammonium nitrate, ammonium sulfate and ammonium phosphate mixture; in some European countries with magnesium nitrate as anti-caking agent for ammonium nitrate

susceptible to thermal decomposition temperature, decomposition products of different, different.

At 110 ° C:

The NH4NO3 → NH3+HNO3+173kJ

In 185 ~ 200 ° C:

The NH4NO3 → N2O+2H2O+127kJ

In the above 230 ° C, while the weak light:

The 2NH4NO3 → 2N2+O2+4H2O+129kJ,

In the above 400 ° C, explosion:

The 4NH4NO3 → 3N2+2NO2+8H2O+123kJ

Pure ammonium nitrate is stable at room temperature, are not sensitive to strike, collision or friction. But at high temperature, high pressure and can be oxidized material (reducing agent) explosion will exist and spark, in the production, storage and use must strictly abide by the safety regulations.

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