Inorganic wastes in manufacturing of glass-ceramics: slurry of phosphorousfertilizer production and oil shale ash

The use of bicomponent raw material mixtures of industrial wastes to produc e pyroxene glass ceramics was investigated. It is shown that oil shale ash from heat power stations can promote the production of crystalline phases a nd the slurry from phosphorous fertilizer production can provide sufficient concentration of nucleating agents. Mechanical and chemical properties, as well as the structure and crystallization mechanism were characterized. An increase of phosphorous oxide and fluorine concentrations leads to a chang e of the crystallization mechanism. (C) 2001 Elsevier Science B.V. All righ ts reserved.