| 摘要 |
A kiln for the production of lightweight aggregates comprises a generally cylindrical heating chamber 10, the heating chamber being disposed for rotation about its axis 'X'. The heating chamber has an inlet end into which material to be treated can be introduced at charge feed tube 36, and an outlet end from which treated material is removed at charge outlet duct 38. The axis is disposed such that it is tilted upwardly from the horizontal in the direction from the inlet end to the outlet end. Typically, the tilt of the heating chamber may be in the range of 6{ to 8{. Preferably, the kiln processes a mixture of expansible aggregate and refractory powder. The tilt causes the aggregate to move through the heating chamber at a rate that is greater than that of the refractory powder, so minimising stiction of material within the kiln. A method of producing lightweight aggregates is also disclosed, comprising the steps of introducing a feed stream comprising a mixture of granular and powdered materials into a heating chamber of a kiln and applying heat to the chamber, where the mixture of powdered and granular materials includes olivine sand. |
