The hammer was cylindrical in shape, with a diameter of 13.4 cm and a height of 23 cm. A 1.5 kg charge of the shredded printed circuit boards was milled in the stamp mill for 60 min by the up-and-down reciprocating motion of the hammer.
The hammer was cylindrical in shape, with a diameter of13.4 cm and a height of 23 cm. A 1.5 kg charge of the shreddedprinted circuit boards was milled in the stamp mill for 60 min bythe up-and-down reciprocating motion of the hammer.