Spent low-level mercury catalyst (SLMC) from the polyvinyl chloride industry is a mercury-containing hazardous waste. Thermal treatment technology was used to detoxify SLMC and recover mercury in this paper. Effects of flow rate of nitrogen, treatment temperature, and time on mercury removal efficiency were estimated 99.91% of total mercury was removed when SLMC was treated at 600°C for 30 min with 120 L/h of nitrogen. SLMC could be detoxified after being treated at 350°C for 120 min, 400°C for 60 min, or 450°C for 10 min based on the TCLP test. Migration rule of mercury during thermal treatment was analyzed by using improved sequential extraction procedure. Soluble and exchangeable mercury, and mercury combined with labile organics, were removed more easily than HgS and mercury combined with non-labile organics. Removal process of total mercury followed a first-order kinetic model. The experimental results may be useful for disposing of SLMC using thermal treatment in engineering practise.

中文翻译：

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通过热处理从废低水平汞催化剂中去除汞

来自聚氯乙烯工业的用过的低含量汞催化剂 (SLMC) 是一种含汞危险废物。本文采用热处理技术对 SLMC 进行解毒和回收汞。当 SLMC 在 600°C 和 120 L/h 的氮气下处理 30 分钟时，估计氮气流量、处理温度和时间对汞去除效率的影响 99.91% 的总汞被去除。根据 TCLP 测试，SLMC 在 350°C 120 分钟、400°C 60 分钟或 450°C 10 分钟处理后可解毒。采用改进的顺序萃取法分析了热处理过程中汞的迁移规律。可溶性和可交换汞以及与不稳定有机物结合的汞比 HgS 和与非不稳定有机物结合的汞更容易去除。总汞的去除过程遵循一级动力学模型。实验结果可用于工程实践中使用热处理处理SLMC。