The invention discloses a long-acting tailing passivator capable of being cured at normal temperature as well as a preparation method and application of the long-acting tailing passivator. According to the invention,
epoxy silane is taken as a main body, aliphatic
polyamine is taken as a curing agent, organic cerous
phosphate is taken as a repairing agent, the surface of
pyrite is coated and passivated through an impregnation method, curing is carried out at normal temperature, and a passive film can inhibit tailing oxidation for a long time. Normal-temperature curing of the passive film is achieved through
chemical reaction curing, and the operation and cost problems caused by high-temperature curing in the industry are avoided; the repairing agent with a simple preparation process can repair a locally damaged
passivation film under the stimulation of acid and alkali, endows the
passivation film with a self-repairing function, improves the effect, reduces the cost, enhances the long-acting
passivation performance, and reduces the application frequency of the passivator. The tailing passivator disclosed by the invention has the characteristics of good passivation performance, good long-
term effect and the like, avoids the defects of complex preparation, high-temperature curing and the like, is convenient for large-scale industrial production and application of tailing
pollution treatment, and can be applied to the field of
metal mine tailing passivation.