Silica brick has many colors, there are three important colour variant: golden, chestnut and blue color, golden yellow and chestnut has a wide distribution variation, according to the discussion, silica brick of iron, chromium and titanium is an important reason of decided its colour diversity, schist generated at the same time with its environment.
1, is the golden thickness variation schist and symbiotic pegmatite to no alteration of the characteristics of sillimanite single crystal. Golden because ferric iron or in individual cases results from trivalent chromium. Golden sillimanite containing compound TieDa and 0.3 1.8% chromium compound.
2, silica chestnut varieties also in thickness variety schist and symbiotic pegmatite schist. Chestnut compound iron content is more than 1% of silica brick.
3, blue silica fire brick and low content of iron phase relationship, combining iron is less than 1%, titanium compound as the trace, like cyanite, color could be the result of valence electrons between softening very, very much.
4, concentrate treated by strong acid, due to remove silica (or decreasing) surface impurities such as iron membrane and red, brown specularite, pale brown golden color be pale or ashes. Refractoriness is mobilized, greater than 1830 degrees, along with the transfer of compound aluminum content increasing.
