Several efforts are made to find various green alternatives for carbonaceous matter (CM) degradation in carbonaceous gold ores. The deleterious effect of CM is observed during cyanidation, where CM adsorbs Au(CN)₂^- behaving like activated carbon, an effect called pre-robbing. Thus, biotechnological approaches like enzyme degradation of CM to reduce Au(CN)₂^- adsorption are currently being studied. In the present work, the potential of CM degradation and gold preg-robbing reduction by laccase-mediator system (LMS) oxidation was evaluated using powder activated carbon (PAC) as CM surrogate material through model experiments. Based upon gas chromatography-mass spectrometry (GC-MS) analysis of extracted by-products from bio-treated PAC, LMS treatment after seven days physically and chemically altered the surface of PAC by the reduction of specific surface area and pore volume, the disruption of aromatic moieties into aliphatic compounds, and the formation of oxygen-containing functional groups. Subsequently, under the studied condition, the adsorption capacity of Au(CN)₂^- on the surface-degraded PAC was dramatically decreased from 46 μmol/g to 7.36 μmol/g. The present findings provide a new outlook of an alternative pre-treatment process of carbonaceous gold ore in mineral processing.

为寻找碳质金矿石中碳质物质 (CM) 降解的各种绿色替代品做出了一些努力。在氰化过程中观察到 CM 的有害影响，其中 CM 吸附 Au(CN) ₂ ^-表现得像活性炭，这种效应称为预抢劫。因此，生物技术方法如酶降解 CM 以减少 Au(CN) ₂ ^-目前正在研究吸附。在目前的工作中，使用粉末活性炭 (PAC) 作为 CM 替代材料，通过模型实验评估了漆酶介体系统 (LMS) 氧化对 CM 降解和金预浸渍还原的潜力。基于对生物处理 PAC 中提取的副产物进行气相色谱-质谱 (GC-MS) 分析，LMS 处理 7 天后通过物理和化学方式改变了 PAC 的表面，通过减少比表面积和孔体积，破坏芳香族部分转化为脂肪族化合物，并形成含氧官能团。随后，在研究条件下，Au(CN) ₂的吸附容量^-在表面降解的 PAC 上，从 46 μmol/g 显着降低到 7.36 μmol/g。本研究结果为矿物加工中碳质金矿石的替代预处理工艺提供了新的前景。