摘要
本研究提出了 FeCl_3—NaCl—HCl—H_2O 溶液浸出含有 Ag_2S、PbS 及 ZnS 的锌渣时的数学模型.在模拟这种浸出过程时必须考虑两种不同类型的反应;硫化物溶解的多相反应和溶液中存在的所有组分的均相溶液反应.前者是动力学控制的慢反应.后者是快的平衡反应。此种情况可以采用部分平衡方法来模拟整个浸出过程.我们采用络合平衡的计算方法和扩展的 BASIC 语言进行计算,得出了在一定条件下锌渣浸出过程中各种金属氯络离子浓度及其配位数随游离的氯离子浓度变化的情况和达到一定浸出率而不出现 AgCl 和 PbCl_2沉淀时所需的 NaCl 浓度.
A mathematical model has been developed for the leaching of a zinc residue consisting Ag_2S,pbS and ZnS using a FeCl_3-NaCl-HCl-H_2O lixiviation When modeling such a leaching process,two different types of reactions must be considered,heterogeneous dissolution reactions of sulfides and homogeneous solution reactions of all species present in the solution The former are slow reactions which are kinetically controlled,the latter are rapid equilibrium rea- ctions This situation allows for the partial equilibrium approach to be utilized to model the overall leaching process. when computing this system,the complex equilibrium calculation approach and the extend BASIC language are used.Under the certain leaching conditions, the changes in concentraion and coordination number of various complex ions with the concentration changes of free chlorine ions are calculated,and for achieNing certain leaching percents of Ag_2S and PbS without AgCl and PbCl_2 precipithetation the ecessary NaCl concentrations in the leaching soluton are also calcal ated.
基金
国家自然科学基金资助的课题
