... sand, cement, dust and coal fly ash, cinder, slag, gangue, gravel,perlite, and other industrial wastes.QT8-15 Hollow Block Making Machine Main ... hydraulic cylinder when working; uses integrated high-pressure and soft oil pipes, with easy installation;3)QT8-15 Block Making Machine ... the mechanical parts, improves the using lifetime of the machine, and reduces the noise;6)QT8-15 Block Making MachineHigh- ...