Passivator used for restraining oxidation of iron pyrite and method for treating iron pyrite based on passivator

The invention discloses a passivator used for restraining oxidation of iron pyrite and a method for treating iron pyrite based on the passivator. The passivator comprises silane and nanosilicon dioxide. According to the method for treating iron pyrite based on the passivator, the surface of the iron pyrite is covered with a film, oxidization of the iron pyrite can be effectively relieved, generation of acid mine waste water can be restrained or relieved from the source, the usage amount of the organic silane is reduced due to usage of the passivator, the stability of a passivation film is improved, the treatment cost of the acid mine waste water is greatly reduced, and environment friendliness is achieved.