First of all, although hydrofluoric acid is theoretically a weak acid with low solubility, it is extremely corrosive, so when choosing chemical pumps, corrosion-resistant fluoroplastic chemical pumps are generally the first choice, fluoroplastic magnetic pumps, fluoroplastic centrifugal pumps are more suitable for fluoroplastic pumps, fluoroplastic pumps in the impeller, the pump cover, are used in the metal inserts outsourcing the fluoroplastic whole sintered pressed and made of the pump body of the main part of the HT200 lined with The main part of the pump body is made of HT200 lined with F46.
Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, clear, colourless, fuming corrosive liquid, with a strong irritating odour, extremely volatile, placed in the air, that is, white smoke. Although it is non-flammable, but can react with most of the metal, generate hydrogen and cause explosion, and hydrofluoric acid is highly hazardous poison, touching the skin easily lead to ulceration, if you inhale the vapour, it can be fatal. So in the selection of chemical pumps suitable for hydrofluoric acid medium we need to pay attention to what special requirements?
The reason for this is due to the relatively strong ability to combine hydrogen and fluorine atoms, so that hydrofluoric acid can not be completely ionised in water, has a strong corrosive, can strongly corrode metal, glass and objects containing silicon, so the ordinary Sic silicon carbide has a free state of silica monomers and silicon dioxide and other impurities, these impurities are easy to be corroded by the hydrofluoric acid, the corrosion will destroy the surface of the abrasive surface of the smoothness, thus affecting the pump's The service life of the pump will be affected.
For the special corrosive medium of hydrofluoric acid, the dynamic and static rings of the mechanical seal of the fluorine lined centrifugal pump and the spindle, shaft sleeve, dynamic and static rings of the fluorine lined magnetic pump must be made of non-pressure sintered silicon carbide.
