中文摘要：

从景天属的植物 alfredii Hance 生物资源重金属沥滤作为沥滤与氨铵氯化物答案被学习代理人。研究在二个阶段被执行：1 ) 决定这个沥滤的代理人的锌抽取效率的沥滤的研究，并且 2 ) 识别可能的反应的热力学的分析和稳定的 Zn (II ) 种类在沥滤的系统形成了。Taguchi 直角的实验与四个可变参数，沥滤在三个层次的温度，到 NH3 的 NH4Cl 的臼齿的比率，沥滤的时间和 solid-to-liquid (L/S ) 比率，和各个，被用来由变化的分析优化实验参数。结果显示那沥滤的温度在金属抽取性能上有最主导的效果，由 NH4Cl 的臼齿的比率列在后面到 NH3， solid-to-liquid 比率和沥滤的时间。最佳条件如下被获得：60 的温度？

英文摘要：

Leaching of heavy metals from Sedum alfredii Hance biomass was studied with ammonia-ammonium chloride solution as leaching agent. The research was carried out in two phases： 1） a leaching study to ＂determine the zinc extraction efficiency of this leaching agent, and 2） a thermodynamic analysis to identify the likely reactions and stable Zn（Ⅱ） species formed in the leaching systems. Taguchi orthogonal experiment, with four variable parameters, leaching temperature, molar ratio of NH4Cl to NH3, leaching time and solid-to-liquid（L/S） ratio, and each at three levels, was used to optimize the experiment parameters by the analysis of variances. The results indicate that leaching temperature has the most dominant effect on metal extraction performance, followed by molar ratio of NH4Cl to NH3, solid-to-liquid ratio and leaching time. The optimum condition was obtained as follows： temperature of 60℃, molecular ratio of NH4Cl to NH3 of 0.6, leaching time of 2 h and solid-to-liquid ratio of 5：1. The total zinc leaching efficiency under optimum conditions reaches 97.95%. The thermodynamic study indicates that the dominant species produced by the leaching process should be the soluble Zn（NH3）4^2＋.