钒钛磁铁矿尾矿资源化利用研究进展

Research Progress on Resource Utilization of Vanadium−Titanium Magnetite Tailings

  • 摘要: 钒钛磁铁矿尾矿中富含钒、钛、磷等战略性资源,其资源化利用对于降低企业尾矿处置成本、提高经济效益、缓解我国资源对外依存度、保障生态环境安全具有重要意义。系统梳理了钒钛磁铁矿有价元素选择性回收和尾矿整体材料化利用两个方面的主要技术进展。在钒回收方面,氟化物溶解—浸出法相比传统碱熔融焙烧工艺具有浸出率高、能耗低的优势,是当前的主流技术方向。在钛回收方面,针对尾矿中钛铁矿嵌布粒度细的特点,采用分级—重选—磁选—浮选联合工艺能够有效富集钛铁矿,获得高品位的钛精矿。在磷回收方面,正浮选工艺可获得高品位的磷精矿,但当尾矿中含有碳酸盐矿物时,磷灰石与脉石的有效分离仍是技术难点。尾矿整体材料化利用方面,发泡陶瓷、建筑用砂等普通建材,以及微晶玻璃、陶粒等高值化建材的制备技术均取得了重要进展,部分技术已实现产业化应用。当前,该领域仍面临有价元素嵌布关系复杂、综合利用率偏低等挑战,未来应加强工艺矿物学研究、开发绿色低毒的浸出体系,并推动尾矿整体利用向高值化方向发展。

     

    Abstract: Vanadium−titanium magnetite tailings are enriched in strategic resources such as vanadium, titanium, and phosphorus. Their resource utilization is of great significance for reducing enterprise tailings disposal costs, enhancing economic benefits, alleviating China's external dependence on these resources, and safeguarding the ecological environment. This review systematically summarizes the major technical advances in two main aspects: selective recovery of valuable elements and bulk material utilization of the tailings. For vanadium recovery, the fluoride dissolution–leaching method has become the mainstream technological direction, offering higher leaching efficiency and lower energy consumption compared with the conventional alkaline fusion roasting process. For titanium recovery, given the fine dissemination characteristics of ilmenite in the tailings, a combined process consisting of classification, gravity separation, magnetic separation, and flotation can effectively upgrade ilmenite and produce high−grade titanium concentrates. For phosphorus recovery, direct flotation can yield high−grade phosphate concentrates; however, when carbonate minerals are present in the tailings, the selective separation of apatite from gangue minerals remains a technical challenge. In terms of bulk material utilization, significant progress has been achieved in the preparation of conventional building materials such as foamed ceramics and construction sand, as well as high−value building materials like glass−ceramics and ceramsite, with some technologies already having reached industrial−scale application. Currently, this field still faces challenges including the complex dissemination relationships of valuable elements and a relatively low overall utilization rate. Future efforts should focus on strengthening process mineralogy research, developing green and low−toxicity leaching systems, and promoting the high−value bulk utilization of tailings.

     

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