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Iron silicate fines is a construction product manufactured by Aurubis Bulgaria, with universal application in many areas of the construction process, starting from the structural elements, through brick walls till finishing works like plasters and coatings for buildings and facilities.

Iron silicate is co-produced during pyrometallurgical smelting and refining of copper from primary raw materials at high temperature in molten state in a furnace and further treatment by a flotation process. The iron silicate is further filtered.

It mainly contains iron silicate, silicates of aluminum and calcium and magnetite. Traces of other non-ferrous metals are reduced to the lowest extent economically and technologically viable, and are largely included in the silicate phases. Its physical and chemical characteristics remain consistent over time.

Iron silicate fines is compatible with a wide range of materials such as limestone, clay, clinker, soils, cement, sand, coarse aggregate, bitumen, polymers, epoxies, and other construction chemical products. Incorporating it in varying proportions allows for the modification of specific properties of the final products and giving them better performance.