Polymetallic-ore beneficiation and separation reagent, preparation method and use thereof

A preparation method for a polymetallic-ore beneficiation and separation reagent, comprising steps of:

• (1) mixing a substance A, caustic soda, soda ash and sodium polysulfide, and then heating a mixture and performing a catalytic reaction, to render an intermediate product B, wherein the substance A comprises one or more of urea, glycine, urea peroxide, ammonium cyanate and isocyanic acid;
• and
• (2) mixing the intermediate product B with trichloroisocyanuric acid, dichloroisocyanuric acid and 2-amino-3-(4-imidazolyl)propanoic acid, to render the polymetallic-ore beneficiation and separation reagent,
• wherein a catalyst for the catalytic reaction comprises at least one of an Au/TiO2 catalyst, a Pd—Cu/C bimetallic catalyst or a magnetic nanocatalyst,
• wherein the magnetic nanocatalyst comprises at least one of Fe3O4—TiO2, TiO2 and FeCo@C nanoparticles.