D411 is used to selectively restrain gangue which is easy to float especially Mica, Talc, Dolomite and so on. Effectively reduce the effect of gangue on the competitive adsorption of the target mineral collector, improve the separation of metallic minerals and gangue minerals; so that the gangue minerals are reunited with each other and then selectively inhibition, to achieve the purpose of mineral and gangue effective separation, access to qualified concentrate products.