| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a treatment method for fly ash where heavy metals can be recovered from fly ash generated at the time of incinerating waste such as shredder dust at a high recovery rate, and can be recycled for a refining raw material or the like. <P>SOLUTION: After an acid leaching stage where acid such as hydrochloric acid is added to slurry comprising fly ash showing acidity when being dissolved in pure water such as fly ash generated at the time of incinerating waste such as shredder dust to regulate its pH to ≤3, preferably to 1 to 2, thus heavy metals are ionized, if required, a sulfurizing stage where a sulfurizing agent is added thereto is performed, and a heavy metal recovering stage where heavy metals such as copper and zinc are separated and recovered by floatation is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
