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随着我国湿法磷酸产业的发展，解决萃余酸高效资源化利用具有重大意义。以碳酸钠为脱氟剂、硅藻土为助脱氟剂，对絮凝沉淀法净化萃余酸得到的澄清液进行脱氟处理。单因素实验表明，最优条件为搅拌转速300 r/min、时间60 min、温度50℃，在此条件下萃余酸净化液w(F)降为0.17%，氟去除率为61%。基于响应面法（BBD）的多因素优化表明，搅拌转速对脱氟效果影响最显著，二次回归模型R2=0.992 3，预测精度高。修正优化条件为搅拌转速350 r/min、时间54 min、温度51℃，3次平行实验实测萃余酸净化液w(F)为0.162 1%，与预测值0.160 7%接近，氟去除率61.4%。本研究为萃余酸脱氟及资源化利用提供了工业化可行方案。
Abstract：With the development of China's wet-process phosphoric acid industry, it is of great significance to solve the efficient resource utilization of the residual acid. Taking sodium carbonate as the defluorination agent and diatomite as the co-defluorination agent,defluorination treatment on the clarifying solution obtained from purifying residual acid by flocculation precipitation method is performed. The single-factor experiment shows that the optimal conditions are the stirring speed of 300 r/min, the time of 60 min, and the temperature of 50 ℃. Under these conditions, the fluorine content in residual acid is 0.17%, and the fluorine removal rate is 61%. The multi-factor optimization based on the response surface method(BBD)indicates that the stirring speed has the most significant influence on the defluorination effect. The quadratic regression model(R2=0.992 3)has a high prediction accuracy.The modified and optimized conditions are the stirring speed of 350 r/min, the time of 54 min, and the temperature of 51 ℃. The measured fluorine content in the three parallel experiments is 0.162 1%, which is close to the predicted value of 0.160 7%. The fluorine removal rate is 61.4%. This study provids an industrialized feasible solution for the defluorination and resource utilization of the residual acid.
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基本信息:
DOI：
中图分类号:TQ126.35
引用信息:
[1]汤建伟,康银吉,杨易金等.萃余酸澄清液脱氟技术开发[J].生态产业科学与磷氟工程,2025,40(06):16-21+78.
基金信息:
贵州省科技计划项目（黔科合中引地[2023]004）; 郑州大学-瓮福集团校企合作重点研发项目（WF-001-2023-JS-00001）