重金屬污泥富含銅、鋅、鎳、鉻、鐵等多種二價/三價金屬，具有鐵氧磁體化之潛勢。本研究以氧化鐵調整重金屬污泥中二價金屬與三價鐵之莫耳比例，透過添加不同碳源調整燒結氣氛，以XRD晶相分析、熟料重金屬殘留率及TCLP重金屬化學穩定性等分析，探討生料組成、燒結氣氛、溫度等燒結條件對於重金屬污泥鐵氧磁體化之影響，最後以含碳鐵礦泥與重金屬污泥檢討共同燒成具穩定性鐵氧磁體之可行性。
研究結果發現重金屬污泥於空氣氣氛下，在700ºC燒結生成穩定之鎳鐵氧磁體，燒結體於TCLP試驗中，銅、鋅、鎳三者不易溶出。氮氣氣氛下，不僅提升鎳鐵氧磁體合成率且有助於抑制重金屬污泥中三價鉻氧化成六價鉻。在添加三價鐵達理論莫耳計量比Fe/M＝2試驗中，不但鐵氧磁體合成量明顯增加、熟料固相重金屬殘留率大幅提升，且鉻溶出行為亦顯著減緩，其溶出值趨近符合法令規範限值。在利用不同碳源型態及碳源添加量試驗中，經由三價鐵調質重金屬污泥於900℃添加3％活性碳之鐵氧磁體合成率高且熟料中各重金屬殘留率高於94％，其重金屬溶出值皆符合法令規範。
綜合上述討論，重金屬污泥與含碳鐵礦泥共同燒結鐵氧磁體研究印證上述最適條件適用於該含鐵廢棄物，為一可行之重金屬污泥穩定化資材化技術。

Heavy metal sludge contains a variety of environmental hazardous heavy metals including copper, zinc, nickel, chromium and iron. With the divalent and trivalent metal ratio, the sludge could be provided as a potential raw material for ferrite stabilizing synthesis. The aim of this study is to stabilize the heavy metal containing sludge via ferrite process, by means of adjusting the molar ratio of divalent and trivalent heavy metals, adding different carbon sources and sintering at different temperatures under air or nitrogen atmospheres. Stabilities of synthesized ferrites were evaluated by quantitative x-ray diffraction analysis (QXRD) and toxicity characteristic leaching procedure (TCLP).
When the sintering temperature is higher than 700°C under air atmosphere, relative intensity to reference (RIR) of ferrites in sintered product increase slightly, and the concentrations of copper, zinc and nickel in the TCLP leachates of sintered products are almost undetectable. By switching the atmosphere into nitrogen, RIR of ferrite not only increases, the oxidation of trivalent chromium into hexavalent chromium is also inhibited. The results in the molar ratio adjustment shows that the amount of ferrite synthesis and heavy metal containing ratio have significantly increases and the leaching concentration of chromium decreases toward the regulatory level. The results in carbon sources and carbon addition shows that the optimal sintering molar ratio is Fe/M =2, 3% of activated carbon addition, sintering temperature 900°C under nitrogen atmosphere. Over 94% of the heavy metals could retain in the sintered product and the retained heavy metals could be protected by the sintered ferrites from leaching out.

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