Environment-friendly nitric acid purifying and refining device and method thereof

[0014] The invention provides an environmentally-friendly nitric acid purification and purification device and a method thereof. The operation of the invention is simple and safe, and the purification and purification effect is excellent.

[0015] The following describes the technical solutions in the embodiments of the present invention clearly and in detail with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0016] Such as figure 1 An environmentally friendly nitric acid purification and purification device and method thereof shown include a reactor 1, the outer wall of the reactor 1 is provided with a cooling interlayer 2, and the upper end of the reactor 1 is provided with a compressed air inlet pipe 3, the compressed air The intake pipe 3 is provided with an intake valve 4, the compressed air intake pipe 3 vertically penetrates the upper end of the reactor 1 and extends into the bottom of the reactor 1, and a purification tank is provided in the middle of the reactor 1 5. One end of the purification tank 5 is fixed on the inner wall of the reactor 1, the compressed air intake pipe 3 in the purification tank 5 is provided with a first diffuser 6, and the compressed air is below the purification tank 5. A solenoid valve 7 is provided on the air intake pipe 3, a second diffuser 8 is provided at the end of the compressed air intake pipe 3 below the solenoid valve 7, and a concentrated nitric acid feed pipe 9 is also provided at the upper end of the reactor 1. The concentrated nitric acid feed pipe 9 is provided with a feed valve 10, the upper end of the reactor 1 is also provided with a suction pipe 11, the upper end of the suction pipe 11 is provided with a suction valve 12 and a vacuum pump 13, the suction pipe 11 The end is located in the lye absorption tank 14, which absorbs impurity gas through acid-base reaction. The inner wall of the reactor 1 is provided with a nitric oxide probe 15 and a nitrogen dioxide probe 16, the nitric oxide probe 15 and the nitrogen dioxide probe 16 A microcontroller 17 is connected, the microcontroller 17 is connected to the solenoid valve 7, a discharge pipe 18 is provided at the lower end of the reaction kettle 1, and a discharge valve 19 is provided on the discharge pipe 18. The microcontroller 17 can be a PLC controller. When it is in use, a threshold can be set, and when it detects that the nitric oxide and nitrogen dioxide exceed the standard, the solenoid valve 19 is opened.

[0017] Furthermore, it also includes a filter 20. The compressed air intake pipe 3 at the upper end of the reactor 1 is provided with a filter 20 to prevent impurities from entering the device and affecting the quality of nitric acid.

[0018] Furthermore, it also includes an inclined plate 21, which is located at the lower end of the purification tank 5. The concentrated nitric acid overflows from the purification tank 5 into the reactor 1, and flows down the inclined plate 21 without affecting the normal operation of the solenoid valve 7. use.