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人类活动对磷元素的地球化学过程具有重要影响。中国磷矿石储量仅占世界总量的4.6%,且正面临P2O5品位贫化、磷化工过程伴生稀土和氟资源浪费严重、副产磷石膏大量堆存污染环境以及地表水体磷污染等问题。今后一段时间内,二水物硫酸法仍将是湿法磷酸的主流工艺。磷矿伴生稀土和氟的高效回收利用,对于稀土产业和氟化工可持续发展具有重大战略意义,关键在于突破现有的技术瓶颈,研发新的回收利用技术。磷化工过程实现硫资源的循环利用和清洁生产,核心在于突破磷石膏制硫酸关键技术。磷石膏转铵法制硫酸技术实现规模化工程应用,可有效解决中国硫资源短缺问题,根除磷石膏大量堆存造成的环境污染;还将显著减少硫铁矿、石灰石等一次资源开采和温室气体CO2排放。硅酸钙晶种法回收污水中的磷,进而加工为磷酸、磷肥等产品,则为减少一次磷资源消耗、实现磷资源的循环利用提供了可能。以污水磷回收制取磷酸二氢钾技术为例,表明污水磷回收和磷石膏资源化利用对中国磷资源产业的绿色可持续发展具有重大潜在价值。
Human activities have an important influence on the geochemical processes of phosphorus. China’s phosphorite reserves account for only 4.6% of the world’s total, and are facing problems such as P2O5 grade depletion, serious waste of associated rare earth and fluorine resources in phosphorus chemical processes, massive storage of by-product phosphogypsum and phosphorus pollution of surface water bodies. In the future period of time, the dihydrate sulfuric acid method will still be the mainstream of wet-process phosphoric acid. Recycling of rare earths and fluorine, associated with phosphate rock, is of great strategic significance for the sustainable development of rare earth industry and fluorine chemical industry. The key lies in breaking through existing technological bottlenecks and developing new recycling technologies. Phosphorus chemical process to achieve the recycling of sulfur resources and cleaner production, the core is to break through the key technology phosphogypsum sulfuric acid. Phosphogypsum quaternary ammonium sulfate technology to achieve large-scale engineering applications, which can effectively solve the problem of shortage of sulfur resources in China to eradicate the environmental pollution caused by a large number of phosphogypsum piling up; will also significantly reduce the pyrite, limestone and other resources exploitation and greenhouse gas CO2 emission. Calcium silicate seed recovery of sewage phosphorus, and then processed into phosphoric acid, phosphate fertilizer and other products, then to reduce the consumption of primary phosphorus resources, to achieve the recycling of phosphorus resources may provide. Taking the recovery of wastewater phosphorus as an example, it shows that the recovery of wastewater phosphorus and the utilization of phosphogypsum have great potential value for the sustainable development of green phosphorus resources in China.