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A method is developed for obtaining blue pigment of ultramarine type; the method involves soft sulphidation of the white clay from the Obskoy open pit with the addition of sodium carbonate and protection of the mixture from oxidation, provided with the use of carbon of coke.
The white clay of the Obskoy pit contains aluminium and silicon in the ratio close to that of the sodalite cell
The white clay used contains only insignificant iron admixture, so the washing with acidic solutions is excluded; the technology is ecologically safer.
The process of obtaining ultramarine is made cheaper
The ultramarine is used in food industry, varnish-and-paint, ceramic, glass industry; it is also used to make coloured concrete, cement, plastics, and to manufacture aqueous dispersion paints.
Technical specifications for obtaining the pigment under laboratory conditions have been developed.
Experimental lots have been manufactures and passed for tests in paving slab.
The technology is being tested at the Novosibirsk Ceramic Product Plant; in case of investment, large-scale production of the pigment is possible.
Patent is granted in 2001 in Russian Federation.
The price of pigment is US$ 2-3 per kg for a ton-scale production (at the level of iron oxide pigments).
Nikolaev Institute of Inorganic Chemistry SB RAS
Acad. Lavrentyev ave., 3, Novosibirsk, Russia, 630090
Scientific secretary of Institute
Gerasko Olga Anatolievna, Doctor of chemical sciences
Phone: +7(383) 330-94-86