【摘要】 对电石法生产聚氯乙烯产生的废汞触媒进行浸出及再生活性炭的研究,以6 mol·L^-1HCl溶液作为浸出剂,在浸出反应温度为65℃、浸出反应时间为90 min和液固比为15∶1的实验条件下得到Hg²⁺的优化浸出率为61.25%。采用扫描电镜（SEM）、Brunauer-Emmet-Tller（BET）比表面积等方法分析再生活性炭特征。结果表明焙烧废汞触媒浸出渣热再生活性炭是可行的,焙烧最佳工艺条件为:焙烧温度850℃,焙烧时间90 min。得到的焙烧产物亚甲基蓝吸附值为120.5 mg·g^-1,BET表面积为704.25 m²·g^-1,平均孔径为3.28 nm。再生前后的汞含量与从1.067%降至0.351%,再生后能再次作为汞触媒生产的催化剂载体材料,同时减缓固废堆积过程中汞流失造成的一系列环境问题。更多还原

【Abstract】 Leaching and activated carbon regeneration from waste mercury catalyst produced during polyvinyl chloride preparation by calcium carbide process were studied. When 6 mol·L^-1 HCl was used as a leaching agent, the optimum leaching rate of Hg²⁺was 61.25% under the conditions of reaction temperature of 65 ℃,reaction time of 90 min and liquid-solid ratio of 15∶1. Scanning electron microscopy（SEM）, Brunauer-EmmetTller（BET） surface area and other analysis methods were used to identify the characteristics of regenerated activated carbon, which indicated that it is feasible to regenerate activated carbon by roasting waste mercury catalyst. The optimum roasting conditions were as following: 850 ℃ for roasting temperature and 90 min for roasting duration. The methylene blue adsorption value, specific surface area and average pore size of the roasted product were 120.5 mg·g^-1, 704.25 m²·g^-1 and 3.28 nm, respectively. Mercury content in waste mercury catalyst decreased from 1.067% to 0.351% after regeneration. The regenerated activated carbon can be used as catalyst carrier material for mercury catalyst production again, and also alleviate a series of environmental problems caused by mercury loss during solid waste accumulation process.更多还原