... moulds are changeable, it’s able to produce different types of blocks/bricksQT8-15 Hollow Block Making Machine Technical Data: Product ... : crushed stone, sand, cement, dust and coal fly ash, cinder, slag, gangue, gravel,perlite, and other industrial wastes.QT8-15 ... compulsory feeding, which greatly improves the density and intensity of the blocks, and reduces the feeding time as well;4) QT8 ...