Cyanide-starved alkaline glycine solutions have been shown to have distinct advantages in terms of lower reagent consumption and detoxification needs, or leach rate and recovery, over cyanide- only and glycine-only leach systems respectively for gold ores with nuisance copper. Activated carbon has been shown to be suitable for gold adsorption from alkaline glycine systems, and is well established for cyanide based systems. Activated carbon being an effective substrate for the adsorption of gold thus offers a possible downstream carbon-in-pulp (CIP) recovery route for alkaline glycine leach systems and hybrid systems in the presence of cyanide. Given the frequent occurrence of gold deposits with high levels of nuisance copper, the equilibrium loading of gold and copper onto activated carbon from cyanide-starved alkaline glycine solutions containing copper and gold has been studied. Adsorption efficiency was studied in terms of equilibrium loading isotherms. Results showed that while copper adsorption is more sporadic based on goodness of fit, gold adsorption is more consistent and clearly follows the Freundlich isotherm model (good linear correlation of log Q vs log C values). The adsorption isotherms were obtained using a gold concentration of 2 ppm. In the presence of copper, the equilibrium gold loading increases with increasing glycine and calcium ion concentrations, decreases with increasing cyanide concentration and is not affected by initial gold concentration. The cuprous cyanide and cupric glycinate complexes lowered gold loading through a competitive adsorption with the copper (I) cyanide complexes adsorbing more rapidly on the carbon than their glycinate counterparts. The equilibrium gold loading capacity in cyanide-starved glycine solutions containing 2 ppm Au and 300 ppm Cu, at pH 11 was found to be 9.95 kg_Au/ton_carbon in 24 h, which is almost four times higher than the gold loading capacity in a pure cyanide system (2.7 kg_Au/ton_carbon) under similar conditions. The study revealed that activated carbon was an effective adsorbent for removal gold from cyanide-glycine aqueous solutions.

与仅使用氰化物和含铜的金矿石的仅氰化物和仅甘氨酸的浸出系统相比，缺乏氰化物的碱性甘氨酸溶液在降低试剂消耗和解毒需求或浸出率和回收率方面具有明显优势。活性炭已被证明适合于碱性甘氨酸系统中的金吸附，并且对于基于氰化物的系统已被充分确立。活性炭是吸附金的有效底物，因此为存在氰化物的碱性甘氨酸浸出系统和混合系统提供了下游的纸浆积碳（CIP）回收途径。鉴于经常发生金矿和滋扰性铜含量很高的情况，研究了含铜和金的氰化物匮乏的碱性甘氨酸溶液中金和铜在活性炭上的平衡负载量。根据平衡负荷等温线研究吸附效率。结果表明，尽管基于拟合优度，铜的吸附较为零星，但金的吸附更为一致，并且明显遵循Freundlich等温模型（log Q与log C值具有良好的线性相关性）。吸附等温线是使用2 ppm的金浓度获得的。在铜的存在下，平衡金的负载量随甘氨酸和钙离子浓度的增加而增加，随氰化物浓度的增加而降低，并且不受初始金浓度的影响。氰化亚铜和甘氨酸铜络合物通过竞争性吸附降低了金的负载量，而氰化铜（I）络合物比甘氨酸铜对应物更快地吸附在碳上。发现在pH为11的氰化物匮乏的甘氨酸溶液中含有2 ppm的Au和300 ppm的Cu的平衡金负载量为9.95 kg24小时内_金/吨_碳，几乎是在类似条件下纯氰化物系统中金载量（2.7千克_金/吨_碳）的四倍。研究表明，活性炭是从氰化物-甘氨酸水溶液中去除金的有效吸附剂。