The utilization and repurposing of waste materials from mining and minerals industry as low-cost adsorbents for valuable metals have received significant attention due to increasing drive for waste valorization, environmental protection and sustainable development. This study investigates the ability of magnetic nickeliferous pyrrhotite obtained from nickel sulphide mine tailings in Western Australia as adsorbent for gold (Au) from chloride solution. The influence of different variables, such as pH, contact time, initial Au concentration, and chloride (Cl^–) concentrations on Au adsorption were examined. The use of magnetic adsorbents is considered as an emerging technology in the recovery of precious metals from aqueous solutions and offers a number of advantages related to ease of solid-liquid separation. The nickeliferrous pyrrhotite samples, composed of ..., were collected (Fe_(1-X)S, 65%), pentlandite ((Fe,Ni)₉S₈, 32%) and trace impurities of alumino-silicate minerals (3%), were collected manually using a permanent magnet, and were prepared by crushing and grinding to the desired particle size. Complete Au recovery (100%) was achieved after 15 min of contact time at acidic pH. It was also found that the magnetic adsorbent exhibited high loading capacity as evident by 100% Au recovery achieved even at higher initial Au concentrations and after eight times re-use of loaded particles. High Cl^– concentration was observed to have a negative effect on Au uptake. The galvanic interaction between pentlandite and pyrrhotite as the possible mechanism for Au recovery is discussed. Repurposing nickeliferous pyrrhotite from mine wastes as magnetic adsorbent for Au offers a very attractive application for the material.

采矿和矿产废料作为廉价的有价金属吸附剂的利用和再利用，由于对废料的估价，环境保护和可持续发展的推动作用日益受到关注。这项研究调查了从澳大利亚西部的硫化镍矿山尾矿获得的磁性镍铁黄铁矿作为氯化物溶液中金（Au）吸附剂的能力。不同变量的影响，例如pH，接触时间，初始Au浓度和氯化物（Cl ^–检查了Au吸附的浓度。磁性吸附剂的使用被认为是从水溶液中回收贵金属的新兴技术，并提供了许多与易于固液分离有关的优点。收集了由...组成的镍铁黄铁矿样品（Fe _（1-X） S，65％），蒙脱石（（Fe，Ni）₉ S ₈含量为32％）和微量的铝硅酸盐矿物杂质（3％），使用永磁体手动收集，并通过粉碎和研磨至所需的粒径制备。在酸性pH下接触15分钟后，金的完全回收率（100％）得以实现。还发现磁性吸附剂表现出高的负载能力，这是由即使在较高的初始Au浓度下和在负载颗粒的再利用八次之后达到100％的Au回收率所证实的。高氯^-观察浓度对金摄取产生负面影响。讨论了方铁矿和黄铁矿之间的电相互作用，作为金回收的可能机理。从矿山废料中重新利用含镍黄铁矿作为Au的磁性吸附剂，为该材料提供了非常有吸引力的应用。