天然炭质对金氰络合物吸附性能的研究

Study on Adsorption Performance of Gold Cyanide Complex-Ion by Natural Organic Carbonaceous

选择类似含炭质但不含金的沉积岩来考察天然有机炭对贵液中金氰络离子的吸附特性。结果表明,所用天然炭质对不同金络离子吸附量不同,在[Au(CN)4]-体系中金的吸附量是[AuI4]-体系中的12倍。天然炭质对金氰络离子吸附初始速率很快,由薄膜扩散控制,接近平衡时吸附速率非常慢,转为粒子扩散控制。氰化金浓度在3~70μg/mL范围内时,天然炭对金的吸附符合Freundlich吸附模型。

Carbonaceous rock bearing organic carbon but free from gold was selected to investigate adsorption of natural organic carbon on gold cyanide complex-ion in precious liquid. The results show that natural organic carbon has different adsorption ability in different gold complex-ion systems, such as, content of natural organic carbon is 11 times higher in [-Au（CN）4-]- system than that in [-AuI4]- system. In [Au（CN）4]- system, the initial adsorption rate is very high with thin film diffusion controlling type, but finally turns to be very slow with particle diffusion controlling. The adsorption type accords with Freundlich model when gold cyanide concentration is 3-70 μg/mL.