| 摘要 |
<P>PROBLEM TO BE SOLVED: To manufacture desired slag whose heavy metal concentration is low by collecting and recycling valuable metal such as lead or zinc from flash furnace dust generated in a flash furnace process, and selectively volatilizing lead and arsenic or the like, and charging treated dust to the flash furnace, thereby decreasing heavy metal such as lead and arsenic migrating to slag generated in the flash furnace. <P>SOLUTION: The operation method of a flash furnace is characterized by adding reducing agent and chloride to flash furnace dust, and carrying out dry heat treatment in an inert gas atmosphere, and volatilizing heavy metals in the dust, and selectively volatilizing heavy metals other than copper, and charging the treated dust to the flash furnace. <P>COPYRIGHT: (C)2012,JPO&INPIT |
