Colored cement bricks such as ceramic glazed tiles use a large number of iron oxide red raw materials. Therefore, the amount of iron oxide red pigment in ceramic pigments is relatively large, and it is estimated that the annual amount is more than 10,000 tons. At present, the production methods of iron oxide red pigments used in ceramic pigments are mainly divided into sulfuric acid method and mixed acid method (nitric acid method).
In the production of ceramic wall and floor tiles, three medium tones of black, yellow and coffee are mainly used. Among them, the black material of the ceramic green body accounts for more than 35 percent of the green body color material, and the annual consumption of the green body black material by the manufacturer reaches 60,000 tons. above.
Iron oxide red pigment is the main raw material for the formulation of green black material, and the content is usually up to 50 percent 80 percent . The color tone of iron oxide red products produced by different manufacturers is quite different.
