FIELD: pigment technologies.
SUBSTANCE: invention is intended for use in varnish-and-paint industry and in rubber and plastics production. Red iron oxide pigment preparation comprises: oxidation of aqueous solutions of ferric sulfate or suspensions of ferric hydroxide with air oxygen at quasi stationary temperature and pH values of reaction medium; hydrothermal heat treatment of suspension of ferric oxyhydroxides in periodical or continuous regimes in autoclaves; washing-out of pigment from water-soluble salts; drying and grinding of the pigment. During hydrothermal heat treatment FeOOH suspension is affected by nanosecond electromagnetic pulses having following characteristics: pulse duration 0.5-5 ns, pulse amplitude 4-10 kv, pulse repetition frequency 200-1000 Hz. Process is carried out at 130-200°С.
EFFECT: lowered FeOOH suspension hydrothermal heat treatment temperature and increased pigment preparation productivity.
1 tbl, 12 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING RED IRON OXIDE PIGMENT | 2016 |
|
RU2640550C1 |
| METHOD FOR PRODUCTION OF NATURAL IRON OXIDE PIGMENT FROM ORE | 2010 |
|
RU2441892C1 |
| METHOD OF PROCESSING IRON ORE TO MAKE COLORING AGENT AND PELLETS | 2011 |
|
RU2476468C1 |
| METHOD OF PRODUCING RED IRON OXIDE PIGMENT | 2021 |
|
RU2767043C1 |
| COMPLEX PROCESSING OF MARTITE-HYDROHEMATITE ORE | 2013 |
|
RU2521380C1 |
| IRON OXIDE PIGMENT AND METHOD FOR PRODUCTION THEREOF | 2013 |
|
RU2543189C2 |
| METHOD OF PRODUCING PIGMENT FERRUM (III) OXIDE HAVING @@@-MODIFICATION | 0 |
|
SU1809833A3 |
| METHOD OF PRODUCTION OF MODIFIED RED IRON OXIDE PIGMENTS | 2006 |
|
RU2309898C1 |
| METHOD FOR PRODUCING MAGNESIUM SULPHATE AND IRON-OXIDE PIGMENTS FROM PRODUCTION WASTES | 2016 |
|
RU2634017C2 |
| METHOD OF PRODUCING RED FERRIC OXIDE PIGMENT | 0 |
|
SU865876A1 |
