| 摘要 |
<p>A dry pulverized clay powder (1) is fed to a calciner (20) to be calcined therein. The clay powder feed (1) is passed through the calciner (20) in direct heat exchange contact with a hot gas (5) passing therethrough to heat the clay powder sufficiently to calcine substantially all the clay powder while passing through the calciner (20). The calcined clay product (3) is removed from the calciner (20) and preferably passed in heat exchange relationship with a cooling medium (71) whereby the calcined clay product (3) is cooled and the cooling medium is heated. The hot off-gas (7) discharged from the calciner (20) is passed through an electrostatic precipitator (30) to remove at least a substantial portion of calcined clay product dust (11) entrained in the exhaust gas from the calciner. The clean gas (13) leaving the electrostatic precipitator (30) is passed in heat exchange relationship with a cooling fluid (51) to further cool the gas, and preferably to evaporate at least a portion of the cooling portion to produce a heating vapor (53). The hot calcined clay dust (11) separated from the hot gas in the electrostatic precipitator (30) is recovered. Preferably, the recovered hot calcined clay dust (11) is mixed with the clay feed material (1) being supplied to the calciner (20) without substantially cooling the hot calcined clay powder collected in the electrostatic precipitator (30).</p> |
