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In the power plants where coal combustion is used to produce electricity and heat, solid combustion products are produced, i.e. furnace waste (ashes and slags) and waste from waste gas extraction. The amount of ash or slag depends on the quality of the coal and the ash content. To get 1 kWh of electricity it is produced from 60 to 200 g of waste. Only in 1989 in Poland, the energy industry produced 23.8 million Mg of waste. Only 4 million Mg of these waste (in the building materials industry) was used, while 19.8 ...