| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To recover a valuable metal from a recycled raw material such as a substrate and to prevent the re-synthesis and discharge of dioxins in an exhaust gas. <P>SOLUTION: The recycled raw material such as the substrate is housed in an exclusive container to be mounted in a dry distillation furnace. In the dry distillation furnace, the temperature in the furnace is raised to 300-400°C in a reducing atmosphere by direct heating due to the flow-in of steam heated by batchwise treatment and indirect heating due to an interpolation heating pipe to perform dry distillation treatment while preventing the transfer of a valuable metal to gas. Dry distillation residue becomes a raw material for metal refinery and the dry distillation gas is perfectly burnt at 800°C or higher in a gas combustion furnace. The exhaust gas after combustion is quenched to 200°C or lower and slaked lime is sprayed on the exhaust gas to neutralize the gas and hydrogen chloride gas is fixed to soot as calcium chloride and the re-synthesis of a harmful gas, especially dioxins is prevented. <P>COPYRIGHT: (C)2004,JPO</p> |
