Preparation of glass-ceramics by the slag of iron melt-reduction from unwieldy hematite

The feasibility of iron-smelting and making glass-ceramics from unwieldy hematite of Xuanhua Iron Mine in Hebei Province, China by melt-reduction method and casting technology was analyzed to prepare pig iron used in steel-making and glass-ceramics for building decoration. By using orthogonal design method, slag-iron separation and slag crystallization were investigated at different ratios of raw materials, and the optimum proportioning by weight of raw materials which could be used in industrial test was determined as the following:hematite 77.3%, alumina 2.2%, quicklime 13.7%, fluor 5%, sodium oxide 1.8%, and coke 5.5%. The phase composition and characteristics of glass-ceramics products were determined by comprehensive methods such as optical microscopy, X-ray diffraction, and physical and chemical properties test.