J. J. Hycnar, Ecocoal Consulting Center Katowice, Poland

B. Kochański, Wyższa Szkoła Zarządzania Marketingowego i Języków Obcych, Katowice, Poland

B. Tora AGH - University of Science and Technology, Poland

 Hard and brown coal combustion in a pulverized-fuel boiler is accompanied by forming ferromagnetic compounds contained in fly ash and slag. The ferromagnetic compounds can be found as follows: the highest quantity in the ash of silicate kind, lower quantity in the ash of aluminum kind, and the lowest quantity in the calcium kind of ash. On the basis of test results on the content of magnetic compounds and total content of iron compounds and two-valued iron there were prepared technical and economic criteria regarding the separation of magnetite dust from fly ash.