| 摘要 |
<p>This invention is intended to provide a rotary kiln for indirectly heating raw material such as ore, coke, etc., while shielding the material from an oxidising combustion flame. This kiln has a structure wherein a fuel combustion chamber and a reaction chamber of the raw material are partitioned by a heat-resistant ceramic shield plate. The fuel is burnt in the combustion chamber and the combustion gas does not enter the reaction chamber. The raw material is heated indirectly inside the reaction chamber through the ceramic shield plate. When the apparatus of this invention is used, the raw material can be heated indirectly to 1400 deg.C or higher while shielding the raw material from the combustion flame by use of an inexpensive fuel and the apparatus of the invention is particularly effective for reduction treatment of ores.</p> |
