Uses and characteristics of ammonium nitrite

Ammonium nitrite is usually used as fertilizer; In pyrolysis technology, herbicides and pesticides; And manufacturing nitrous oxide. It is used as an adsorbent for nitrogen oxides, a component of frozen mixtures, an oxidant in rocket propellants, and a nutrient for yeast and antibiotics. It is also used for blasting rocks and mining explosives (especially as oil mixtures). nitrite and nitrite are used to marinate meat and form a unique flavor and pink color to prevent rancidity and prevent the growth of botulinum toxin spores in or on the meat.

Ammonium nitrite is the nitrite of ammonium cation (NH4NO3, sometimes written as N2H4O3). It is a white crystalline solid and very soluble in water. It is mainly used in agriculture as a high nitrogen fertilizer, and also as a component of explosive mixtures in mining, quarrying and civil buildings.

 

Ammonium nitrite (NH4NO3) is produced by neutralizing nitric acid (HNO3) with ammonia (NH3). All ammonium nitrite plants produce ammonium nitrite aqueous solution by reacting ammonia and nitric acid in neutralizer, as shown in the following formula:

 

The process includes several unit process operations, including (1) solution formation and concentration, (2) solid formation, (3) finishing, (4) screening and coating, (5) product bagging and/or bulk transportation. In some cases, the solution can be mixed and sold as a liquid fertilizer. The number of operating steps depends on the product specification. For example, plants that produce only ammonium nitrite solutions use only solution formation, solution mixing, and bulk transport operations. All of the above operations can be used in plants producing solid ammonium nitrite products. About 15% – 20% (v/v) of ammonium nitrite prepared by this method is used for explosives, and the rest is used for fertilizer.

 

Before solidification of the melt, additives such as magnesium nitrite or magnesium oxide can be introduced into the melt to increase the crystallization transition temperature, act as a desiccant (to remove moisture) or reduce the solidification temperature. Products are sometimes coated with clay or diatomite to prevent caking during storage and transportation, although additives can eliminate the need for coatings. The final solid products are screened and graded, and the unqualified particles are dissolved and recycled through this process.

Characteristics of ammonium nitrite

Ammonium nitrite (NH4NO3, CAS RN: 6484-52-2) is a crystalline powder with colors ranging from almost white to brown. It is classified as an oxidizing agent and will accelerate combustion in a fire. Ammonium nitrite does not burn itself, but contact with other combustible substances will increase the fire risk, even without oxygen. When the fire source or heat source is isolated in a closed container of ammonium nitrite (e.g., storage tank, container), the reaction can be converted into a violent explosion, which is called deflagration explosion transition, or DDT.

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