Production of black iron oxide from red mud

Production of black iron oxide from red mud Production of inorganic pigments was studied, and specifically that of iron oxide black pigment, which can be used in paint-and-varnish industry and in manufacture of building and other pigmented materials. Results are presented of phase and chemical analyses of raw materials and final product. A technological scheme is suggested and production parameters of the black pigment from red mud are recommended. The pigment is produced from the −0.045 mm fraction of red mud, a waste from alumina industry. It is recommended to perform calcination at 850°C in a controlled atmosphere with deficiency of oxygen. This method yields an iron oxide pigment of purely black color with a coverage power of 8–10 g m−2 from a waste produced in manufacture of alumina, red mud (up to 90%), without additional additives and provides reduction of Fe(III) to Fe(II) by the sulfide sulfur present in the starting mud. Russian Journal of Applied Chemistry Springer Journals

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Pleiades Publishing
Copyright © 2015 by Pleiades Publishing, Ltd.
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
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