Goethite method requires harsh environment during the process of iron precipitation, in order to use advanced optimization control technology in the process of iron precipitation during hydrometallurgy, the features of gas, liquid, and solid-liquid two-phase in the process of iron precipitation were analysed. According to the characteristics of continuous stirred tank reactors in series (n-CSTR), based on the reaction kinetics and mass conservation law, the dynamic differential equation of oxidation reaction, hydrolysis reaction and neutralization reaction in the process of iron precipitation was established using goethite method, the mechanism model of the process of iron precipitation through the multi-delay differential equations was established, and the state equation about input/output relationship in the process of iron precipitation obtained by the dynamic differential equations was obtained. The simulation results and actual measurements results were compared. The results show that the model can reflect well the change processes of Fe2+ and H+ concentration in the reactor solution, and it is applicable to the implementation for the use of advanced optimization control technology.%针对针铁矿法沉铁过程要求苛刻的沉铁环境,为了实现先进优化控制技术在湿法炼锌过程中针铁矿法沉铁过程中的应用,通过分析针铁矿法沉铁过程中气-液和固-液两相反应特点,根据串联连续搅拌槽式反应器(n-CSTR)的特性,基于化学反应动力学和质量守恒定律,分别建立针铁矿法沉铁过程中氧化反应、水解反应和中和反应的动态微分方程；然后,通过带多重时滞的动态微分方程组建立针铁矿法沉铁过程的机理模型,并且由动态微分方程组得到针铁矿法沉铁过程输入、输出关系的状态方程.最后,对该模型的计算值和实际测量值进行比较.研究结果表明:该模型能较好地表征各反应器溶液中Fe2+质量浓度和H+浓度的变化过程,为下一步先进优化控制技术的实施打下了良好的基础.
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