Abstract: Though the experiment selective flocculation study of the conventional Flocculant and the new synthesis of Flocculant flocculation for single mineral and artificial mixed minerals, get the order of merits of three kinds of flocculants on flocculation of fine hematite-quartz system: starch-acrylamide graft copolymer > sulphonated polyacrylamide > causticizing cornstarch, considering the grade and recovery index, the starch acrylamide graft copolymer best effect. When the starch acrylamide graft copolymer dosage is 3mg/L, the iron grade of fallout is 42% and iron recovery rate is 91.42%, when the dosage is 1mg/l, the highest grade of the flocculated mass is 45%, compared with the raw ore increased 12 percentage points, to create the conditions for using conventional mineral processing methods further separation of floc aggregate.