... China. Our company (Zhengzhou Dahua Mining Machinery Co,LTD ) offer PCB recycling equipments , this system has two sections .One is dry ... dust collector, so little air pollution.Description: 1.put old PCB board into primary crusher, the material will be crushed; output ... would be sent into rotary screen, rotary screen have four layers, four discharge opening: one 20mm ,two 40mm,three 60mm ,four ...