| 摘要 |
A method of manufacturing porous moulded bodies in which crushed crystaline silicate material is mixed with alkali silicates in the ratio of 2-6:1, the mixture containing 15 percent water by weight of dried substance. The mixture is heated in a closed vessel affording a constant volume system at 140 DEG -500 DEG C so as to avoid the vapour phase and produce a transformation product which is then dried, crushed and heated, if necessary with additives. There is also provided a device for heating the crushed transformation product, the device comprising a bell-type furnace with a hearth plate on which a stack of moulds is placed, an annealing bell having heating elements removably disposed over the hearth plate and a further cooling cap over the hearth plate. |
