树脂吸附铜锌离子的数值模拟

镀金原料氰化亚金钾的生产过程含氰废液中锌(Ⅱ)离子和铜离子(Ⅱ)浓度较高,为探究树脂吸附铜、锌离子的规律,运用Aspen Adsorption数值模拟软件对Φ10 mm×200 mm的树脂固定床吸附过程进行数值模拟,采用一阶迎风差分法作为偏微分方程的离散方法,研究不同条件下的吸附穿透曲线和吸附负荷分布曲线.结果表明:增加进料流量和进料浓度均可提高吸附效率,传质系数(KS)大于临界值时,吸附穿透曲线不再受其影响,K_S(Zn²⁺)=4.3×10^-3s^-1, K_S(Cu²⁺)=1.00×10^-2s^-1.

Mathematical simulation on adsorption of zinc ion and copper ion with resin

Zinc(Ⅱ) ion and Copper(Ⅱ) ion come from the process of producing potassium aurocyanide, gold-plated material. Adsorption process of zinc ion and Copper ion resin in a φ10 mm×20 mm adsorption column was simulated and studied with the aid of Aspen Adsorption. Ion concentration at exit of adsorption column vs time curve and bed axial loading distribution of ion were obtained from simulation results with discrete partial differential equations of first order upwind difference method. The time of breakthrough was shortened, as feed flow rate and feed concentration increase respectively. The adsorption breakthrough curves did not change with mass transferring coefficient any more When the mass transfer coefficient is greater than the critical value, K_S(Zn2+)=4.3×10-3 s-1, K_S(Cu2+)=1.00×10-2 s-1. The modeling study provides reference data for scale-up experiment and industrial application.