Titanium palladium alloy for acid regeneration

In the manufacture of flat steel products, after the hot rolling process, the plate is covered with a layer of oxides. This layer is removed before the cold rolling process through pickling with hydrochloric acid (HCl). Due to the formation of iron chloride (FeCl₂), HCl loses its ability to remove iron oxide (II) (FeO) from the surface. Therefore, continuously new acid is mixed in the container and the used acid is collected at one end thereof. In the exhausted pickling solutions, a metal content of up to 150-250 g/L is observed. In the case of the steel industry, the pyrohydrolysis is the preferred technology for the regeneration of hydrochloric acid from depleted pickling solutions, obtaining Fe₂O₃ as a byproduct. This technology can be performed using processes of spray roasting. The spray roasting process allows almost complete hydrochloric acid recovery in a closed cycle. The iron oxide that is additionally obtained, also called Ruthner powder, is a brown or red hematite, which is considered an important raw material in various industry sectors.

In the whole process of spray roasting, we can supply ventruri and nozzle tube/ nozzle plate, made of titanium Gr7 (titanium pladium alloy) to prevent the corrosion of waste acid effectively.