FIELD: chemistry.
SUBSTANCE: to obtain brown iron oxide pigment red mud - waste of alumina production - is annealed. Before annealing red mud is divided by classes of coarseness with selection of fraction to 0.01 mm. Annealing of this fraction is realised in air at temperature 220-280°C. Invention makes it possible to obtain pigment of brown colour with hiding power 8-9 g/m2 without additional additives.
EFFECT: reduction of amount of harmful emissions into the environment.
1 tbl
| Title | Year | Author | Number |
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RU2117019C1 |
