D421 is used to restrain mud and reborn mud during mining process, can improve flotation rate greatly, meanwhile reduce reagent dosage and increase concentrate grade.

The product is also used to selectively restrain Sulfide Mineral such as Pyrite, Pyrrhotite, Arsenopyrite and so on. There is significant effect on the separation of minerals and sulfur-containing minerals. In particular, D421 can replace the usage of large quantity lime, green environmental protection.