The iron oxide red raw material we use daily is often used in various industries because of its bright color and better coloring strength. Among them, the use and development in the ceramic industry is relatively good. Let’s look at the iron oxide red in the ceramic industry. In the use.
1. Application:
Ceramic products are mainly divided into seven categories: architectural ceramics, sanitary ceramics, garden glass ceramics, art ceramics, daily-use ceramics, industrial ceramics, and special ceramics. Iron oxide pigments are widely used in these seven types of ceramic products.
2. Characteristics and principles:
Iron oxide pigments have coloring properties. The coloring properties of iron oxide are mainly used in ceramics to prepare various colors of glaze water. Due to the different valence of iron ions, the iron oxide itself is multi-colored. When iron oxide is added to other glazes , Make the glaze color richer and brighter. In addition, in the ceramic (glaze) manufacturing process, different firing atmospheres are used, and the color of iron oxide is also different. In an oxidizing flame atmosphere, the color of iron oxide changes from yellow to reddish brown, and then changes to grape red. Brown. In a reducing atmosphere, the color changes from blue to gray and dark. These changes are the result of the mutual transformation of the dynamic balance of Fe2+ and Fe3+ in the glaze layer.
1. Application of iron oxide as raw material for green body: green body is the base material for ceramics.
Iron oxide is used as the raw material colorant of the green body, which is mainly used in the wall and floor tile products of architectural ceramics. For example, for imitation granite unglazed porcelain tiles, the pigment preparation process is:
Iron oxide pigment and a small amount of raw material are mixed into a color paste in a ball mill, and then controlled by a metering pump to enter the mixer. In the mixer, a certain proportion of color paste and base paste are mixed at high speed to form a color paste. Spray into the drying tower to produce colored powder.
2. Application of iron oxide in ceramic color glaze: The glaze is a continuous vitreous layer attached to the ceramic surface.
In ordinary ceramics, the coloring property of iron oxide is mainly used to prepare various colors of glaze water. The price of iron ions is different, and the iron oxide itself presents different colors. For example, iron trioxide (Fe2O3) is red powder, and ferrous oxide (FeO) and ferroferric oxide (Fe3O4) are black powder. Different iron oxide compounds can be selected according to needs. In addition to the multi-colored iron oxide itself, when iron oxide is added to other glazes, it can make the glaze richer and brighter. For example, iron oxide is added to the boric acid glaze containing alkali metals to present the red color of wine; when iron oxide is added to the semi-matte and matte white glaze, it presents a series of shades of light brown, yellowish gray and camel to dark brown; when When iron oxide is used to make yellow glaze, only a few percent of iron oxide needs to be added to show a strong yellow color.
When using iron oxide pigments, we can choose the color according to the different characteristics of the use. Iron oxide red, yellow, green, black, blue, and other color models are available, and they can be purchased by themselves.
