Printed circuit boards with electronic components were combusted in a fluidized bed reactor in air-liq. petroleum gas stream. The combustion products were leached with concd. H2SO4 and HNO3/H2SO4 at 50 degrees C for 120 min. The metal recovering degree ranged from 99.95% (Cu) to 97.42% (Mn), with the exception of lead (2.60%), when H2SO4 was used, and from 99.94% (Cu) to 71.73% (Ti) when in a 2-stage process H2SO4 and HNO3/H2SO4 were used.