Copper slags containing high amounts of zinc oxide were evaluated for making glass-ceramic materials. Differential thermal analysis, X-ray diffraction and scanning electron microscopic techniques were used in this investigation. The slag compositions were modified by adding appropriate amounts of silica sand. Some nucleating agents such as chromium oxide and calcium fluoride were investigated. The developed crystalline phases and microstructures were determined in relation to glass compositions, nucleating agents used and heat-treatment parameters applied. Pyroxenes, spinels and willemite were the main cystalline phases developed in the obtained glass-ceramic materials. The developed glass-ceramics possess very high hardness and excellent chemical durability in both acidic and alkaline media. The obtained results are discussed in the light of crystal chemistry of minerals.
