| 摘要 |
technology of inorganic pigments, more particularly manufacture of building materials in paint and varnish industry. SUBSTANCE: method comprises mixing of blend components, wt parts: while clay, 10; sodium carbonate, 6.5-7.6; sulfur, 2.0-2.4. In this case, reducing agent which is located above blend is used and heat treatment. Blend is heated first to 200 C and temperature is then raised to 300 C and is subsequently heated to 680-720 C and kept for 2.0-3.5 hours, cooled in furnace to room temperature and is then annealed in air at 580-620 C for at least 3 hours. Clay comprises wt %: aluminium oxide, 28-29; silicon oxide, 58-59; and impurities, the balance. EFFECT: improved quality of ultramarine spectral characteristics, such as brightness and color saturation, and cheaper process. 2 cl, 2 ex
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