A method and device for preparing magnesium nitrate solution using nitric acid tail gas

A technology of nitric acid tail gas and nitric acid tail gas pipe, applied in the field of magnesium nitrate preparation, can solve the problems of increased ammonia consumption and reduced nitric acid production, and achieve the effects of high NO utilization, thorough reaction, energy saving and environmental protection production cost

Active Publication Date: 2015-10-28
宁夏润夏能源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the loss of nitrogen oxides in the tail gas will also increase the consumption of ammonia per ton of nitric acid, and at the same time reduce the production of nitric acid, so the tail gas of nitric acid must be treated

Method used

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  • A method and device for preparing magnesium nitrate solution using nitric acid tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of method utilizing nitric acid tail gas to prepare magnesium nitrate solution, comprises the steps:

[0035] (1) After the nitric acid tail gas is washed by the washing tower, it is sprayed with water into the surface of magnesium oxide to form a solution; the pressure inside the washing tower is 0.03MPa, the temperature at the bottom is 30°C, and the temperature at the top is 20°C; the nitrogen in the tail gas discharged from the washing tower is The oxide content is less than 200PPm.

[0036] (2) Pass compressed air evenly into the solution at a temperature of 20°C in (1) for stirring to form a magnesium nitrate solution, and adjust its pH to be neutral;

[0037] (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;

[0038] (4) Precipitate for 8 hours and filter to obtain the finished magnesium nitrate...

Embodiment 2

[0040] A kind of method utilizing nitric acid tail gas to prepare magnesium nitrate solution, comprises the steps:

[0041] (1) After the nitric acid tail gas is washed by the washing tower, it is sprayed with water into the surface of magnesium oxide to form a solution; the pressure inside the washing tower is 0.05MPa, the temperature at the bottom is 40°C, and the temperature at the top is 20°C; the nitrogen in the exhaust tail gas of the washing tower is The oxide content is less than 200PPm.

[0042] (2) Pass compressed air evenly into the solution at a temperature of 40°C in (1) for stirring to form a magnesium nitrate solution, and adjust its pH to be neutral;

[0043] (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;

[0044] (4) Filter after 9 hours of precipitation to obtain the finished magnesium nitrate s...

Embodiment 3

[0046] A kind of method utilizing nitric acid tail gas to prepare magnesium nitrate solution, comprises the steps:

[0047] (1) After the nitric acid tail gas is washed by the washing tower, it is sprayed with water into the surface of magnesium oxide to form a solution; the pressure inside the washing tower is 0.08MPa, the temperature at the bottom is 60°C, and the temperature at the top is 50°C; the nitrogen in the tail gas discharged from the washing tower is The oxide content is less than 200PPm.

[0048] (2) Pass compressed air evenly into the solution at a temperature of 60°C in (1) for stirring to form a magnesium nitrate solution, and adjust its pH to be neutral;

[0049] (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;

[0050] (4) Filter after 10 hours of precipitation to obtain the finished magnesium nit...

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Abstract

The invention provides a method for preparing a magnesium nitrate solution by using nitric acid tail gas, which comprises the following steps: respectively injecting nitric acid tail gas after being washed by a washing tower and water on magnesium oxide surface to form a solution; uniformly introducing compressed air and then stirring to generate the magnesium nitrate solution; filtering the magnesium nitrate solution and then introducing in the washing tower and repeatedly generating the magnesium nitrate solution to increase its concentration; deposing for 8-10 hours, and filtering to obtain the finished product magnesium nitrate solution. The invention also provides an apparatus. According to the invention, a non-pressure process and a pressurization method are used for producing dilute nitric acid, tail gas generated by dilute nitric acid contains a lot of nitrogen oxides such as NO and NO2, the nitrogen oxides are washed by the washing tower to remove the impurities, and then added in magnesium oxide with water and compressed air, so that nitrogen oxides, water, and alkalescence suspending liquid prepared by oxygen and magnesium oxide are reacted to directly generate the magnesium nitrate solution. According to the invention, reaction is mild, acid mist and nitrogen oxides are not generated, so that personal safety is ensured and environment can not be polluted, and magnesium nitrate concentration can be gradually increased to 40%.

Description

technical field [0001] The invention relates to the technical field of preparing magnesium nitrate, in particular to a method and a device for preparing magnesium nitrate solution using nitric acid tail gas. Background technique [0002] Nitric acid production uses acid to absorb nitrogen oxides under normal pressure. The acid absorption rate is generally 90-92%, and the acid absorption rate can reach 96-99% under pressure, but it cannot be completely absorbed. Therefore, the exhaust gas from nitric acid production contains a considerable amount of nitrogen oxides (NO X ), these nitrogen oxides are scattered into the atmosphere with the exhaust gas, endangering people, livestock and crops, and corroding buildings and other facilities. A device with a daily output of 400 tons of nitric acid has a tail gas volume of 40,000 NM 3 / hour, its nitrogen oxides are 0.04-0.3%, that is, 1600-12000 NM 3 per hour, causing serious pollution to the surrounding environment. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/38B01D53/56B01D53/79
Inventor 郑仁雨
Owner 宁夏润夏能源化工有限公司
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