Copper stabilization in beneficial use of waterworks sludge and copper-laden electroplating sludge for ceramic materials.
Copper stabilization in beneficial use of waterworks sludge and copper-laden electroplating sludge for ceramic materials.
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DOI：
10.1016/j.wasman.2013.07.001
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发表时间：
2014-06
期刊：
影响因子：
8.1
通讯作者：
Yuanyuan Tang;S. Chan;K. Shih
中科院分区：
文献类型：
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作者：
Yuanyuan Tang;S. Chan;K. Shih
在这项研究中，设计了一个有前途的战略，有效地将含金属的废料到各种陶瓷产品。元素分析证实，铜是收集到的电镀污泥的主要金属成分，而铝则是香港收集到的水厂污泥的主要成分。使用自来水厂污泥作为富铝前体材料，以促进铜在热条件下的稳定化，提供了一种有前途的废物资源化策略。当烧结铜污泥和900 °C煅烧的自来水厂污泥的混合物时，CuAl2O4尖晶石相首先在650 °C下检测到，并且在高于850 °C的温度下成为主要产物相。采用Rietveld方法对XRD图谱进行了定量分析，结果表明，在850 °C时，CuAl2O4尖晶石相的重量达到50%以上。CuAl2O4相的强信号持续到温度达到1150 °C，并且进一步烧结开始产生其他含铜相（CuAlO2、Cu2O和CuO）。通过pH值为4.9的长期浸出实验，通过CuAl2O4和CuO的铜可溶解性来评价铜的稳定效果。结果表明，在较长的浸出时间内，CuAl2O4相对有害铜的固定效果上级CuAlO2和CuO相。研究结果清楚地表明，尖晶石的形成是最重要的金属稳定机制时，烧结多相铜污泥与富铝自来水厂污泥，并建议一个有前途的和可靠的技术，用于再利用这两种类型的污泥废物陶瓷材料。
A promising strategy for effectively incorporating metal-containing waste materials into a variety of ceramic products was devised in this study. Elemental analysis confirmed that copper was the predominant metal component in the collected electroplating sludge, and aluminum was the predominant constituent of waterworks sludge collected in Hong Kong. The use of waterworks sludge as an aluminum-rich precursor material to facilitate copper stabilization under thermal conditions provides a promising waste-to-resource strategy. When sintering the mixture of copper sludge and the 900 °C calcined waterworks sludge, the CuAl2O4spinel phase was first detected at 650 °C and became the predominant product phase at temperatures higher than 850 °C. Quantification of the XRD pattern using the Rietveld refinement method revealed that the weight of the CuAl2O4spinel phase reached over 50% at 850 °C. The strong signals of the CuAl2O4phase continued until the temperature reached 1150 °C, and further sintering initiated the generation of the other copper-hosting phases (CuAlO2, Cu2O, and CuO). The copper stabilization effect was evaluated by the copper leachability of the CuAl2O4and CuO via the prolonged leaching experiments at a pH value of 4.9. The leaching results showed that the CuAl2O4phase was superior to the CuAlO2and CuO phases for immobilizing hazardous copper over longer leaching periods. The findings clearly indicate that spinel formation is the most crucial metal stabilization mechanism when sintering multiphase copper sludge with aluminum-rich waterworks sludge, and suggest a promising and reliable technique for reusing both types of sludge waste for ceramic materials.