【摘要】 湿法磷酸生产过程中伴生氟的高值资源化利用是推动磷化工绿色低碳的关键环节。针对行业长期存在的二水法磷酸萃取尾气洗涤系统产生的氟硅酸浓度低、杂质磷含量高、硅胶堵塞严重、系统运行周期短等关键技术难题，通过流程再造和核心参数调整，开发了一套全新的磷氟资源回收工艺。该工艺构建了“源头阻磷-过程除硅-末端净气-循环提浓”的磷氟梯度定向分离系统，通过旋风除沫、“文丘里+沉降+压滤”集成、塔后高效气液分离、多级闭环循环洗涤，系统解决了磷氟产品品质与稳定性的难题；通过精准调控混酸器高度，将气相氟占比从17%提升至30%左右。产业化应用结果表明，新工艺可使氟硅酸产品中磷含量（以P₂O₅质量分数计）稳定降至≤250 mg/kg，浓度（以H₂SiF₆质量分数计）提升至12%～18%，尾气洗涤系统连续运行周期从7 d延长至50 d以上，氟硅酸实现从副产废酸到化工原料的根本性转变。更多还原

【Abstract】 The high-value resource utilization of associated fluorine in wet-process phosphoric acid production is the key link to promote green and low-carbon phosphorus chemical industry. Aiming at the long-standing key technical problems in the industry,such as low fluosilicic acid concentration,high impurity phosphorus content,serious silica gel blockage,and short system operation cycle,a new phosphorus and fluorine resource recovery process has been developed through process reengineering and core parameter adjustment.This process constructs a phosphorus fluorine gradient directional separation system consisting of “source phosphorus blocking-process silicon removal-end gas purification circulation concentration”. Through cyclone foam removal, integration of “Venturi + sedimentation + pressure filtration”, high-efficiency gas-liquid separation after the tower,and multi-stage closed-loop circulation washing,the problems of quality and stability of phosphorus fluorine products are solved. By precisely adjusting the height of acid mixer,the proportion of fluorine in the gas phase is increased from 17% to about 30%. The results of industrial application show that after adopting the new process,the phosphorus content（calculated by P₂O₅ mass fraction）in fluorosilicic acid products has steadily decreased to ≤250 mg/kg,the concentration（calculated by H₂ SiF₆ mass fraction）has increased to 12%%-18%,and the continuous operation cycle of tail gas washing system has been extended from 7 days to more than 50 days,thus realizing the fundamental transformation of fluorosilicic acid from waste acid as a by-product to chemical raw materials.更多还原