活性炭吸附提取氰化亚金离子的数学模拟

Mathematical Simulation on Adsorption of Aurous Cyanide Ion with Activated Carbon

以含金工业废水的处理装置为研究对象及镍离子代替氰化亚金离子,对Φ0.2 m×0.5 m吸附柱中活性炭吸附氰化亚金离子进行数学模拟,得到不同条件下氰化亚金离子的吸附柱穿透曲线和吸附负荷分布曲线.结果表明,当氰化亚金离子的进料流量为0.001 m3/s,进料浓度为7.614?10?5 kmol/m3,传质系数为0.001 s?1时,吸附床层开始穿透时间为47.61 h,完全被穿透时间为124.14 h;增大进料流量和进料浓度可提高床层被穿透的速度,而当传质系数≥0.001s?1时,氰化亚金离子吸附穿透曲线不再随传质系数增大而变化.

Adsorption of aurous cyanide ion in gold-bearing industrial wastewater on activated carbon in a Φ0.2 m×0.5 m adsorption column was simulated by replacing aurous cyanide ion with nickel ion, and the breakthrough curves of aurous cyanide ion and adsorption capacity distribution under different conditions were obtained. The results show that at the feeding flow rate of 0.001 m^3/s, feeding concentration of 7.614×10^-5 kmol/m^3 and mass transferring coefficient of 0.001 s^-1, the beginning and completing adsorption breakthrough time of aurous cyanide ion absorbed by activated carbon was 47.61 h and 124.14 h, respectively. With increasing of the feeding flow rate and feed concentration, the breakthrough time was shortened. The adsorption breakthrough curves did not change with mass transferring coefficient any more when the value of mass transferring coefficient was over 0.001 s^-1.