OBTAINING RED IRON OXIDE PIGMENT Russian patent published in 2019 - IPC C01G49/06 C09C1/24 B82B3/00 B82Y30/00 

FIELD: construction.

SUBSTANCE: invention can be used in production of ceramic construction materials, polymers, paints, varnishes and paper. Method of producing haematite pigments involves reacting iron with an aqueous suspension of hematite nuclei and iron (II) nitrate solution in the presence of at least one oxygen-containing gas at temperatures of 70 to 99 °C. Hematite nuclei are characterized by particle size of 100 nm or less and measured according to DIN 66131 specific BET surface area of 40 to 150 m²/g. Interaction is carried out by means of hydraulic mixing of liquid phase by means of at least one pump. Liquid phase is taken from the reactor at the outlet and returned to the inlet of the reactor. Saturation with at least one oxygen-containing gas is carried out at its volume flow rate of 6 m³ on m³ volume of initial mixture per hour or less.

EFFECT: invention increases output of red iron oxide pigments with a wide colour spectrum, reduces energy losses and the amount of nitrogen oxides released into the environment.

7 cl, 1 dwg, 4 tbl, 12 ex