用城市污泥还原铁素体不锈钢酸洗污泥的金属回收和重金属迁移特性。
Metal recovery and heavy metal migration characteristics of ferritic stainless steel pickling sludge reduced by municipal sludge.
机构信息
School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China.
School of Energy and Environment, Anhui University of Technology, Ma'anshan 243000, China.
出版信息
Waste Manag. 2022 May 1;144:57-66. doi: 10.1016/j.wasman.2022.03.010. Epub 2022 Mar 18.
A new method for recovering metals from ferritic stainless steel pickling sludge using municipal sludge as a reducing agent is proposed. The effects of temperature, municipal sludge blending ratio, and reaction atmosphere on the recovery characteristics were studied. The migration characteristics of heavy metals (HMs) at different temperatures were also investigated. The results showed that municipal sludge can be used as a reducing agent for metal recovery from pickling sludge. Under optimized conditions (temperature of 650 °C and blending ratio of 5%), the recovery fractions of Fe, Cr, and Ni were 70.1, 53.7, and 60.3%, respectively. The CO atmosphere was beneficial for increasing the recovery fraction of the pickling sludge. The migration fractions of Cr, Mn, and Ni were approximately 10%. The migration fractions of Zn, Cu, and Pb, which are semi-volatile HMs, varied significantly with temperature. The migration fractions of Cd and As, which are volatile HMs, could exceed 70%.
提出了一种利用城市污泥作为还原剂从铁素体不锈钢酸洗污泥中回收金属的新方法。研究了温度、城市污泥混合比和反应气氛对回收特性的影响。还研究了重金属（HM）在不同温度下的迁移特性。结果表明，城市污泥可用作从酸洗污泥中回收金属的还原剂。在优化条件下（温度为 650°C，混合比为 5%），Fe、Cr 和 Ni 的回收分数分别为 70.1%、53.7%和 60.3%。CO 气氛有利于提高酸洗污泥的回收分数。Cr、Mn 和 Ni 的迁移分数约为 10%。Zn、Cu 和 Pb 的迁移分数，这些是半挥发性 HM，随温度变化显著。Cd 和 As 的迁移分数，这些是挥发性 HM，可超过 70%。
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