| 简介 |
PROBLEM TO BE SOLVED : To provide a concrete method and suitable conditions for effectively utilizing Fe content while suppressing the content of accessory Zn with respect to a wet type magnetic adhesion sorting technique for effectively utilizing the Fe content in secondary dust in a reduction furnace largely containing the Zn. SOLUTION : Secondary dust collected from a reduction furnace reducing product such as dust generated in an iron-manufacturing process is made into slurry of pH ≥8 and pH ≤10, the slurry is subjected to ultrasonic treatment while jointly using mechanical stirring causing no precipitation, thereafter, the slurry or diluted slurry obtaining by diluting the same is subjected to wet magnetic force sorting at the magnetic force satisfying the surface magnetic flux density of ≤0.4 teslas, and the separated substance on the side of magnetic adhesion is dewatered, and is thereafter used as the raw material in an iron-manufacturing process. COPYRIGHT : (C)2011, JPO&INPIT |
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