Heavy-metal high flocculant and application thereof

The invention relates to heavy-metal high flocculant and application thereof in the treatment of heavy metal-containing waste water and belongs to the technical field of waste water treatment. The flocculant is obtained by uniformly mixing a polysilicate aluminum ferric sulfate solution and a dimethyl diallyl ammonium chloride solution, wherein the preferable mixing temperature is 70-100 DEG C. The high flocculant is used for treating the low-concentration heavy-metal mixed waste water, and the concentration of the heavy metal can reach the standard so as to be discharged after being subjected to the flocculation deposition; when the high flocculant is used for the high-concentration heavy-metal waste water, a majority of the heavy metal is transferred into the floc after being subjected to the flocculation deposition, so that the load can be alleviated for the subsequent treatment, and the precipitate floc can be returned to a smelting process so as to recycle the heavy metal.