Starch graft polymers. I. Graft Co‐ and terpolymers of starch with 2‐hydroxy‐3‐methacryloyloxypropyl‐trimethylammonium chloride and acrylamide: Preparation and evaluation as silica depressants

摘要

AbstractThe title monomers have been grafted onto wheat starch by γ‐radiation‐induced polymerization in water providing three graft polymers containing poly2‐hydroxy‐3‐methacryloyloxypropyltrimethylammonium chloride (I) and two graft polymers containing polyI and acrylamide (II). Characterization is discussed together with their utility as silica depressants in flotation‐beneficiation of siliceous ores. Results are provided to illustrate that a starch graft copolymer containing 15 poly(I) graft and a graft terpolymer containing 30 poly(I, II) in the ratio 1:2 are effective as selective depressants for silica in flotation‐beneficiation of Florida pebble phosphate ore using special flotat