Shanxi Shenglonghua Pure Iron Knowledge Popularization:

Ferrous metals are the industrial term for iron, chromium, and manganese, and also include alloys of these three metals. Therefore, the term "ferrous" can easily lead people to mistakenly believe that pure iron must be black, while non-ferrous metals must be colorful. In fact, pure iron and chromium are silver-white, while manganese is silver-gray. However, the surface of pure iron is covered with a black oxide film: iron(II,III) oxide (Fe?O?). It is precisely because of this oxide film that pure iron leaves people with a black impression. So, how can the black oxide film on the surface of pure iron be removed to reveal its silver-white metallic luster? Shanxi Shenglonghua Pure Iron is equipped with two large crawler shot blasting machines. Their working principle involves placing a specified amount of pure iron blocks into the cleaning chamber, closing the door, and starting the machine. The pure iron blocks are driven by rollers and begin to tumble. At the same time, the shot blaster ejects steel shot at high speed, forming a fan-shaped stream that uniformly strikes the surface of the pure iron blocks, thereby removing the black oxide film and revealing the silver-white luster of pure iron.