METHOD OF PRODUCING IRON OXIDE PIGMENTS WITH ANTICORROSION PROPERTIES Russian patent published in 2017 - IPC C09C1/24 C09D5/08 

FIELD: paint industry.

SUBSTANCE: invention can be used in paint industry for production of primers and protective coatings. To obtain iron oxide pigment with anticorrosion properties calcined alumina production wastes – red mud. Before calcination red sludge is separated according to grain size with extraction of fraction up to 0.02 mm and additionally from 0.02 to 0.045 mm. Said fraction treated with phosphoric acid while heating to pH = 6, suspension is filtered, dried, calcined in air, cooled and milled. When backing at temperature of 200–250 °C obtaining brown pigment. In case of calcination at temperature 600–650 °C red pigment colour is obtained.

EFFECT: invention enables to obtain iron oxide pigments with spreading capacity 8–10 g/m² using red mud without additional raw materials and additives, eliminating harmful emissions into environment.

1 cl, 1 tbl, 1 ex