METHOD OF PROCESSING WASTES OF APATITE-NEPHELINE FLOTATION Russian patent published in 2003 - IPC

FIELD: chemical technology of inorganic agents; production of materials for paint- and-varnish industry, coagulants and building materials. SUBSTANCE: proposed method of processing foamed product of apatite-nepheline flotation includes magnetic separation for obtaining non-magnetic fraction which is introduced into sulfuric acid solution at concentration of sulfuric acid of 10-15% till pH gets equal to 1.8-2.2, after which liquid phase is separated and solid phase is again introduced into sulfuric acid solution at concentration of sulfuric acid of 10-15%. Mixture is held at temperature of 40 to 100 C for 1-5 hours, after which solid sediment is separated. Solid sediment is dried and ground to size of particles of 5-40 mkm, thus obtaining titanium- containing pigment composition. As a result, yield of valuable components is increased and they are concentrated as useful composite materials. EFFECT: reduced amount of wastes. 1 tbl, 3 ex