Method for preparing magnesium nitrate solution by using nitric acid tail gas and apparatus thereof
A nitric acid tail gas and magnesium nitrate technology, applied in the direction of magnesium nitrate, separation methods, chemical instruments and methods, etc., can solve the problems of reduced nitric acid production and increased ammonia consumption, and achieve high NO utilization, complete reaction, energy-saving and environmentally friendly production cost effect
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[0037] Example one:
[0038] A method for preparing magnesium nitrate solution using nitric acid tail gas includes the following steps:
[0039] (1) The nitric acid tail gas is washed by the scrubber and sprayed into the magnesium oxide surface with water separately to form a solution; the pressure in the scrubber is 0.03MPa, the temperature at the bottom is 30℃, and the temperature at the top is 20℃; the exhaust gas of the scrubber contains nitrogen The oxide content is less than 200PPm.
[0040] (2) Evenly pass compressed air into the solution with a temperature of 20°C in (1) and stir to produce a magnesium nitrate solution, and adjust its pH to neutral;
[0041] (3) After the magnesium nitrate solution is filtered, it enters the washing tower and repeats the steps (1) and (2) to increase the concentration of the magnesium nitrate solution until the reaction is completed;
[0042] (4) Filter after 8 hours of precipitation to obtain the finished magnesium nitrate solution.
[0043]
Example Embodiment
[0044] Embodiment two:
[0045] A method for preparing magnesium nitrate solution using nitric acid tail gas includes the following steps:
[0046] (1) The nitric acid tail gas is washed by the scrubber and sprayed into the magnesium oxide surface with water separately to form a solution; the pressure in the scrubber is 0.05MPa, the temperature at the bottom is 40℃, and the temperature at the top is 20℃; the exhaust gas of the scrubber contains nitrogen The oxide content is less than 200PPm.
[0047] (2) Evenly pass compressed air into the solution with a temperature of 40°C in (1) and stir to generate a magnesium nitrate solution, and adjust its pH to neutral;
[0048] (3) After the magnesium nitrate solution is filtered, it enters the washing tower and repeats the steps (1) and (2) to increase the concentration of the magnesium nitrate solution until the reaction is completed;
[0049] (4) Filter after 9 hours of precipitation to obtain the finished magnesium nitrate solution.
[0050...
Example Embodiment
[0051] Embodiment three:
[0052] A method for preparing magnesium nitrate solution using nitric acid tail gas includes the following steps:
[0053] (1) The nitric acid tail gas is washed by the scrubber and sprayed into the magnesium oxide surface with water separately to form a solution; the pressure in the scrubber is 0.08MPa, the temperature at the bottom is 60℃, and the temperature at the top is 50℃; the exhaust gas of the scrubber contains nitrogen The oxide content is less than 200PPm.
[0054] (2) Evenly pass compressed air into the solution with a temperature of 60°C in (1) and stir to generate a magnesium nitrate solution, and adjust its pH to neutral;
[0055] (3) After the magnesium nitrate solution is filtered, it enters the washing tower and repeats the steps (1) and (2) to increase the concentration of the magnesium nitrate solution until the reaction is completed;
[0056] (4) After 10 hours of precipitation, filter to obtain the finished magnesium nitrate solution.
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