The results of experimental investigation concerned vitrifying of coal fly ash by the vitrification method are presented in the paper. The fly ash used was collected from thermal power plants: firing lignite. After burning the lignite for electricity, lignite fly ash LFA is produced; this is considered a waste product. Currently only a few percent of the LFA that is produced in the lignite fired power plants is used in the building industry. In most countries the LFA is disposed in the lignite mines. This can cause various environmental impacts. Wind can erode LFA deposits, harmful particles are blown into the environment. Furthermore the leaching of polluting substances to the soil and groundwater is considered a problem. The properties of glasses obtained in the vitrification process were investigated. The experimental investigations were carried out in the fixed bed reactor. The laboratory studies were performed using the plasma method of vitrification. The obtained results showed effectiveness of the vitryfication method in vitrifying of coal fly ash. Glasses produced from LFA had amorphous texture and high physical durability. Soluble salts of four heavy metals (cadmium, chromium, lead and zinc) were used for doping the fly ash. Leachability of the heavy metals used from LFA samples and from the products of vitrification was examined according to Polish regulations. Crystallisation of minerals in the vitrufication glass was investigated using the XRD method. The effect of heat treatment was examined by hardness measurement on the glass and glass-ceramic. Using of material as: material in building industry, and building and roads industry, constructional and thermo-insulating material, depend on vitryfication proces.

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