[1] Inst Technol Nucl & Other Mineral Raw Mat, Dept Chem Engn, 86 F dEsperey St,POB 390, Belgrade 11000, Serbia
[2] Univ Belgrade, Dept Met & Technol, Innovat Ctr, 4 Karnegijeva St, Belgrade 11120, Serbia
[3] Univ Belgrade, Dept Met & Technol, 4 Karnegijeva St, Belgrade 11120, Serbia