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碳质金矿焙烧预处理技术研究进展及展望

Research progress and prospects of roasting pretreatment technologies for carbonaceous gold ores

  • 摘要: 碳质金矿因含有大量有机碳和硫化物,在氰化浸出过程中易产生“劫金”效应,严重影响金回收。焙烧预处理技术是破解碳质物吸附与硫化物包裹的关键途径。系统综述了碳质金矿焙烧预处理技术的研究进展,重点分析了氧化焙烧、微波焙烧及真空焙烧等主流工艺的原理、影响因素与应用效果。传统氧化焙烧通过高温氧化有效破坏碳质结构、释放包裹金,显著提高金浸出率,但存在高能耗与环境污染问题。富氧焙烧、悬浮焙烧等改进工艺在提升反应效率与降低排放方面表现优异。微波焙烧利用电磁波选择性加热,具有快速、节能、避免烧结等优势,尤其适用于难处理微细粒金矿,但技术成熟度仍有待提高。真空焙烧在无氧环境中实现硫化物热分解与金解离,从根本上避免SO2等有害气体生成,具备显著环保优势,然而高能耗与设备要求限制其广泛应用。通过对比各类焙烧技术的能耗、效率与环保性能,为工艺优化选择提供理论依据,并指出未来应聚焦于多技术耦合、参数优化、能耗降低与废气资源化研究,以推动碳质金矿绿色高效预处理技术的发展。

     

    Abstract: Carbonaceous gold ores contain substantial organic carbon and sulfides, which readily cause the preg-robbing effect during cyanide leaching, seriously impairing gold recovery. Roasting pretreatment is a key approach to overcome the adsorption by carbonaceous matter and the encapsulation by sulfides. This paper systematically reviewed the research progress in roasting pretreatment technologies for carbonaceous gold ores with emphasis on the principles, influencing factors, and application effects of mainstream processes including oxidative roasting, microwave roasting, and vacuum roasting. Conventional oxidative roasting effectively destroys the carbonaceous structures and releases encapsulated gold through high-temperature oxidation, significantly improving gold leaching rates. However, it suffers from high energy consumption and environmental pollution. Improved processes such as oxygen-enriched roasting and suspension roasting show superior performance in enhancing reaction efficiency and reducing emissions. Microwave roasting utilizes electromagnetic waves for selective heating, offering advantages such as rapid processing, energy savings, and avoidance of sintering, which make it particularly suitable for refractory fine-grained gold ores, whereas its technological maturity still needs improvement. Vacuum roasting enables thermal decomposition of sulfides and gold liberation in an oxygen-free environment, fundamentally avoiding the generation of harmful gases like SO2, and thus having significant environmental benefits, yet its high energy consumption and stringent equipment requirements limit its widespread application. By comparing the energy consumption, efficiency, and environmental performance of various roasting technologies, this paper provides a theoretical basis for process optimization and selection. It also points out that future efforts should focus on multi-technology coupling, parameter optimization, energy consumption reduction, and off-gas resource utilization, so as to promote the development of green and efficient pretreatment technologies for carbonaceous gold ores.

     

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