磷石膏中磷、氟资源回收技术现状与展望

    Current status and prospects of phosphorus and fluorine resource recovery technology from phosphogypsum

    • 摘要: 磷石膏是湿法磷酸生产工艺的副产物,产量大且大量堆存于矿山中,其夹带的磷、氟在堆存及利用过程中不仅存在渗漏风险,污染环境,也会加大其后续利用的难度。同时,磷、氟是支撑我国经济与社会高速发展的重要资源,对磷石膏中磷资源、氟资源进行回收利用意义重大。本文通过收集和分析相关文献资料,对磷石膏进行了系统研究。在成分特性方面,磷石膏主要成分是二水硫酸钙,含量可达80%~90%,含有一定量的磷、氟及其他杂质。磷以可溶磷、难溶磷和共晶磷形态存在,可溶磷易污染环境,难溶磷可转化为可溶磷产生危害,共晶磷影响磷石膏在建筑等领域的应用;氟以可溶氟和难溶氟形态存在,可溶氟污染地下水和土壤,难溶氟影响土壤酸碱度,危害生态环境。本文介绍了化学沉淀法、吸附法、水洗净化法、电凝聚法、膜分离法、生物修复法和生物淋洗法等磷、氟回收方法,并总结各种方法的优缺点,同时对磷石膏的磷氟回收利用进行了展望,磷、氟回收技术虽取得进展,但仍面临挑战,未来应着重于技术创新,提高回收效率;推进联合工艺集成与协同优化,优势互补;加速智能化与自动化进程,提升稳定性;拓展跨学科研究,形成新思路和新方法,以实现磷资源、氟资源的高效回收利用和环境效益、经济效益、社会效益的统一。

       

      Abstract: Phosphogypsum is a by-product of the wet phosphoric acid production process, with a huge output and a large number of piles in the mine, and the entrained phosphorus and fluorine not only have the risk of leakage and pollute the environment in the process of storage and utilization, but also increase the difficulty of its subsequent utilization. At the same time, phosphorus and fluorine are important resources that support the rapid development of China’s economy and society, and it is of great significance to recycle phosphorus and fluorine resources in phosphogypsum. In this paper, a systematic study of phosphogypsum is carried out by collecting and analyzing relevant literature. In terms of ingredient characteristics, the main component of phosphogypsum is calcium sulfate dihydrate, with a content of up to 80%-90%, containing a certain amount of phosphorus, fluorine and other impurities. Phosphorus exists in the form of soluble phosphorus, insoluble phosphorus and eutectic phosphorus, soluble phosphorus is easy to pollute the environment, insoluble phosphorus can be converted into soluble phosphorus to cause harm, eutectic phosphorus affects the application of phosphogypsum in construction and other fields. Fluorine exists in the form of soluble fluorine and insoluble fluorine, soluble fluorine pollutes groundwater and soil, insoluble fluorine affects soil pH value and endangers the ecological environment. The phosphorus and fluorine recovery methods such as chemical precipitation, adsorption, water washing and purification, electrocoagulation, membrane separation, bioremediation and biological leaching are introduced. The advantages and disadvantages of various methods are summarized, and the phosphorus and fluorine recycling of phosphogypsum is prospected. Joint process integration and collaborative optimization, and complement each other’s advantages are promoted. The process of intelligence and automation, and improve stability is accelerated. Interdisciplinary research is expanded. New ideas and new methods are formed, and the efficient recycling of phosphorus and fluorine resources and the unity of environmental, economic and social benefits are realized.

       

    /

    返回文章
    返回