Change of casting material reduces environment polution

After passing the world energy crisis in seventies, most of the countries are interested in reduction of energy consumption in manufacturing. One of the reasons is that the electric power industry significantly pollutes the environment. In particular, the power industry based on the coal-type materials is the main source of the atmosphere pollution due to large volumes of carbon, sulfur and nitrogen oxides produced. Compared to other countries, Polish industry is much energy - consuming (see Fig. 1 and 2) and it is in over 70% based on the coal. lt can be confirmed by the summary of the main air pollutants, shown in Fig. 3 where their total volumes are split into the following four sources: public power plants, non-public power plants, manufacturing and others. [...]