中文摘要：

采用水泥作为固化剂对锌污染高岭土进行固化／稳定处理，采用TCLP淋滤试验对固化后养护7和28天的人工锌污染土的化学淋滤特性进行了研究。结果表明，当初始Zn^2＋抖浓度达到某一临界值之前，浸出液pH保持在10-12之间，超过临界浓度后，浸出液pH迅速下降至8以下；EC值随初始Zn^2＋浓度变化同样存在临界值，超过这一临界值后，浸出液的EC值迅速上升至7．8mS／cm以上；浸出液pH值随初始Zn^2＋浓度不同分布在6．7—11．6的范围内；在这一范围内，Ca^2＋和Zn^2＋浓度随pH值升高而降低；浸出液中，由水泥固化土中淋滤出的Ca^2＋与Zn^2＋为淋滤液中的主要离子成分。

英文摘要：

This paper presents a study of Toxicity Characteristic Leaching Procedure （TCLP） leaching characteristics of ce- ment-based solidified/stabilized zinc contaminated kaolin. Zinc contaminated soils used in the test were artificially prepared with varying initial Zn^2＋ concentration, the cement content and the curing time. Results indicate that the pH of leachate remained stable between 10 and 12 before initial Zn^2＋ concentration reached a threshold. When the initial Zn^2＋ concentration exceeded this threshold, the pH value of leachate declined sharply below 8. There is also a threshold of initial Zn^2＋ concentration for the EC value. When the initial Zn^2＋ concentration exceeded this threshold, EC of leachate rose sharply above 7.8 mS/cm. The pH of leachate changed with initial Zn^2＋ concentration and ranged from 6.7 to 11.6. Within this range, the concentration of Ca^2＋ and Zn^2＋ decreased with the increase in pH of leachate. Ca^2＋ and Zn^2＋ ions were dominant in the leachate.