铅锌尾矿资源化利用关键技术研究进展

Research Progress on Key Technologies for Resource Utilization of Lead−zinc Tailings

  • 摘要: 铅锌是重要的有色金属,随着铅锌矿产资源的规模化开发利用和采出矿石品位的降低,大量的铅锌尾矿堆存占用土地资源,并存在地质灾害和环境污染风险等。总结归纳了铅锌尾矿的物理性质和化学性质特点,全面分析了铅锌尾矿堆存造成的地质灾害和重金属、选矿药剂及酸性水污染等突出问题。针对再选回收—制备材料—充填利用的综合利用技术路线,综述了铅锌尾矿的资源化利用现状,如再选回收铅、锌、铁及锰等有价金属和硫铁矿、萤石、重晶石及绢云母等非金属矿物;铅锌尾矿作为主要原料用于制备微晶玻璃、地质聚合物、发泡陶瓷、水泥、混凝土、砖、陶粒、ZSM−5分子筛、聚合硫酸铁及轻质碳酸钙等;铅锌尾矿用于矿山井下充填采空区。分析了铅锌尾矿资源化利用的研究进展及存在问题,指出铅锌尾矿综合利用未来应重点关注的研究方向,再选回收应加快低成本高效工艺技术研究,材料化应用应探索生产高附加值产品和防止产生重金属、选矿药剂污染,充填利用应聚焦低成本绿色充填技术开发,为铅锌尾矿低污染、高值化、大宗量的资源化利用途径提供了参考依据。

     

    Abstract: Lead and zinc are important non−ferrous metals. However, with the large−scale development and utilization of lead−zinc mineral resources and the decrease in ore grade extracted, the massive stockpiling of lead−zinc tailings not only accumulated land but also poses risks of geological disasters and environmental pollution. This paper systematically reviews the physical and chemical properties of lead−zinc tailings, and then generally analyzes the geological disasters and environmental pollution, including pollution from heavy metals, flotation reagents and acidic water. Aimed at resource utilization technology route for reselection—material preparation—filling utilization, the current research advances in tailings valorization are summarized, including reselection of metallic values metal elements such as Pb, Zn, Fe and Mn, reselection of non−metallic minerals such as pyrite, fluorite, barite and sericite. They are used as a primary raw material in manufacturing construction materials such as glass−ceramics, geopolymers, foamed ceramics, cement, concrete, bricks, ceramsite, ZSM−5 zeolite, polyferric sulfate and fine calcium carbonate. They can also be used as backfill materials for underground mine voids. This article analyzes the research progress and existing problems in the resource utilization of lead−zinc tailings, and points out the research directions that should be focused on in the future for the comprehensive utilization of lead−zinc tailings. Additionally, research into low−cost, efficient process technology for recycling should be accelerated. The production of high−value products should be explored, and heavy metal and mineral processing agent pollution should be prevented. The focus of filling utilization should be on developing low−cost green filling technology. This paper serves as a reference for the utilization of lead−zinc tailings with low in pollution, high in value and in large quantities.

     

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