There are two kinds of law and the transformation of ammonium nitrate and production methods .
Transformation is the use of nitrate fertilizer production process , Deputy
Produced four water
Calcium nitrate
As raw materials,
And
Ammonium carbonate
The reaction solution ,
Generation of ammonium nitrate and
Calcium carbonate precipitation
,
After
Filtered , and the filtrate processed into ammonium nitrate fertilizer product or return
Production System
.
Neutralization reaction and the method may be performed under atmospheric pressure , pressure or vacuum conditions. If inexpensive steam source ,
Can be
Pressure
And in order to save equipment investment, simplify operations. And pressurizing the reaction heat can be recycled byproduct
Steam for preheating raw materials and concentrated ammonium nitrate solution . Ammonia and
Concentration
As
64%
When nitric acid , ammonia per ton
Byproduct
Steam
Approximately
1t
. Using a vacuum and are produced with a combination of crystalline ammonium nitrate , ammonium sulfate and their equipment
Production of saturated crystallizer similar.
Industrial use is more pressing in and processes. Pressure and in
0.4
~
0.5MPa
And
175
~ 180 ° C
Under operation, the nitric acid concentration is
50%
~
60%
, First with ammonia and to
pH
As
3
~
4
In order to reduce ammonia losses, plus
Ammonia adjusted to
pH
About
7
The concentration of ammonium nitrate solution to give
80%
~
87%
. The recovered steam to evaporate
Ammonia
Or as an ammonium nitrate solution was evaporated in vacuo
Heat
.
Dilute ammonium nitrate solution was obtained and ,
Evaporated in vacuo
Or falling film evaporation method to concentrate
95
~
99%
Then granulated using different methods . Is the application of spray granulation tower
The most widespread method for granulating ammonium nitrate .
