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卡林型金矿矿石性质复杂,自然金崁布粒度细,品位低,被黄铁矿、砷黄铁矿包裹现象普遍,其浮选精矿中砷、硫含量高,含砷含碳,是一种典型的难处理金矿。而采用微生物预氧化技术处理卡林型金矿与采用传统的焙烧技术相比具有显著优势。综述了国内外卡林型金矿生物预氧化技术相关的菌种选育、预氧化基本原理、主要预氧化过程及对应工艺的最新研究进展,对影响卡林型金矿微生物预氧化的因素特别是矿石方面因素和微生物方面因素进行了深入探讨,最后提出了卡林型金矿微生物预氧化技术未来研究和发展可能的几个方向:加强对卡林型金矿有良好适应性和针对性且同时具备优良耐酸能力、耐热能力和耐砷能力的菌种选育,为整个预氧化过程提供可行性保障;推进卡林型金矿生物预处理技术配套的自动化设备研制与开发,包括对浸矿体系pH值、营养物质、菌种数量、温度、氧化还原电位、Fe2+、Fe3+、可溶含砷物质以及生成的沉淀物质情况等进行实时动态监测和调控,保证整个预处理过程稳定、高效的进行;加强矿石中劫金碳物质的钝化或降解机制的研究和探索,最大限度减少其对后续氰化浸金过程的影响;发展微细粒度物料制备技术,提高生物浸矿效率。
Carlin-type gold ore complex nature of natural gold cloth fineness, low grade, was pyrite, arsenic pyrite parcels widespread, the flotation concentrate arsenic, sulfur content is high, containing arsenic carbon, is A typical refractory gold mine. The use of microbial pre-oxidation technology to deal with Carlin-type gold deposits compared with the traditional roasting technology has significant advantages. This review summarizes the latest research progresses of the breeding, pre-oxidation, the main pre-oxidation process and the corresponding process of strain-related bio-oxidation of Carlin-type gold deposits in the world. It is an in-depth discussion of ore factors and microbiological factors. Finally, several possible directions for the future research and development of microbial oxidation of Carlin-type gold deposits are proposed: to strengthen the adaptability and pertinence of Carlin-type gold deposits At the same time with excellent acid resistance, heat resistance and arsenic-resistant bacteria breeding, the entire pre-oxidation process to provide feasible protection; promote Carlin-type gold mine biological pretreatment technology automation equipment development and development, including the dip The real-time dynamic monitoring and regulation of the pH value, nutrients, strain number, temperature, redox potential, Fe2 +, Fe3 +, soluble arsenic and sediment generated in the ore body can ensure the stable and efficient whole pretreatment process ; To strengthen the research and exploration of gold passivation or degradation mechanism of gold in the ore, to minimize its subsequent cyanide leaching of gold The impact of the process; the development of fine-grained material preparation technology to improve bio-leaching efficiency.