Type selection and material Analysis of nitric Acid pump

For the medium of concentrated nitric acid pump, the selection of concentrated nitric acid pump is a problem often encountered in the selection of pump users. Many users first consider using stainless steel pump when choosing concentrated nitric acid pump, but in practice, it is found that the service life of using stainless steel pump to transport nitric acid is not long.

First of all, we should look at the characteristics of the concentrated nitric acid pump:

1. Concentrated nitric acid pump is strong acid, with acidity.

2. The concentrated nitric acid pump has strong oxidizability, and the higher the concentration, the stronger the oxidizability.

3. Concentrated nitric acid pump belongs to volatile acid, the higher the concentration, the stronger the volatility (more than 98% are smoke concentrated nitric acid pump).

4. The concentrated nitric acid pump is unstable and decomposes when illuminated or heated.

5. Concentrated nitric acid pump is highly corrosive, not only corroding the skin, but also rubber (fluorinated rubber) and so on.

Why not recommend stainless steel pump?

A.The seal of the stainless steel pump is equipped with a fluorine rubber O-ring, which will naturally be corroded by the concentrated nitric acid pump for a long time, resulting in leakage.

B.The concentrated nitric acid pump will have obvious corrosion to stainless steel 304.

C.If 316L stainless steel is used, the cost of the pump will be greatly increased.

Concentrated nitric acid pump which kind of pump is recommended?

Concentrated nitric acid pump chemical HNO3. The anhydrous pure concentrated nitric acid pump is a colorless liquid, which is easy to decompose nitrogen dioxide and is reddish brown. The commonly used concentrated nitric acid pump contains about 365% HNO, the density is 1.4g/cm3, and has a strong pungent odor and corrosiveness. It can react with almost all metals, but not with fluoroplastics, so the concentrated nitric acid pump is economical and durable.

If it is 98% concentrated nitric acid pump, you can choose IHF fluoroplastic centrifugal pump or FSB fluoroplastic chemical centrifugal pump. The over-flow parts of this series of pumps are made of fluoroplastic (polyperfluoroethylene propylene). The mechanical seal adopts bellows mechanical seal filled with tetrafluoroethylene material to effectively prevent concentrated sulfuric acid leakage. The power of the selected motor needs to be increased, and the shaft power of the concentrated nitric acid pump can be calculated according to the rated shaft power of the pump.

The utility model is a single-stage single-suction fluoroplastic alloy chemical centrifugal pump, which is designed according to international standards and combined with the processing technology of the non-metallic pump. The utility model has the advantages of corrosion resistance, wear resistance, high temperature resistance, non-aging, high mechanical strength, non-toxic decomposition, wide use temperature, transport medium temperature-85 ℃-200 ℃ and the like.

The special chemical pump for FSB horizontal fluoroplastic concentrated nitric acid pump is designed according to international standards. The pump body is lined with polyperfluoroethylene (F46) in the metal shell, and the pump cover, impeller and shaft sleeve are sintered and pressed with metal inserts wrapped with fluoroplastic. The shaft seal adopts external bellows mechanical seal, the static ring adopts 99% alumina ceramic or silicon nitride, and the moving ring adopts tetrafluorine packing, which is corrosion-resistant and wear-resistant. it is suitable for conveying any concentration of sulfuric acid, hydrochloric acid, hydrofluoric acid, concentrated nitric acid pump, aqua regia, strong alkali, strong oxidant, organic solvent, reducing agent and other harsh conditions.