Abstract: A pyrolysis system for trash and refuse utilization having a heated low temperature carbonization drum with a device for feeding material to be carbonized located at one end face of the drum, a residue discharge device at the other end face of the drum, a low temperature carbonization gas exhaust, and a gas converter connected to the low temperature carbonization gas exhaust for converting the low temperature carbonization gas into cracked gas, includes means for supplying to the low temperature carbonization drum part of a quantity of cracked gas flowing out of the gas converter as a heat carrier.

Abstract: A process and apparatus for separating solid granular metallurgical products. A plurality of linearly vibrating screens are housed, one over the other, each inclining more than the one above and each having a smaller mesh opening than the one above and 1.5 to 15 times larger than the desired parting size. The solids are fed onto the uppermost screen at the upper end thereof and are deflected in the direction of inclination of the screen. The finer solids initially fall through freely and on screens having smaller mesh openings and are also deflected in the direction of inclination of the screen. The coarsest solids fraction is withdrawn as overflow from the uppermost screen, finer solids fractions are withdrawn as overflow from following screens, and solids which have passed through all screens are withdrawn as a finest fraction. A gaseous fluid is flowed through at least part of the working space required for screening approximately transversely to the direction in which the solids pass through the screens.