响应曲面法优化PAC深度净化高浓度硫酸钠溶液中F-的研究
收稿日期: 2023-07-26
网络出版日期: 2024-06-20
Study on response surface methodology optimization of PAC for deep purification of fluorine ion in high concentration sodium sulfate solution
Received date: 2023-07-26
Online published: 2024-06-20
提出了以聚氯化铝（PAC，下同）深度净化高浓度硫酸钠溶液中F-，研究了铝氟物质的量比、反应终点pH和絮凝时间对F-去除率的影响。通过响应曲面法得到的回归方程模型来预测F-深度净化得到最佳的实验条件参数，同时用得到的响应曲面图和等高线图来直观反应各因素对F-去除率的影响及交互作用强弱。影响F-去除率的显著性因素从高到低依次为反应终点pH、铝氟物质的量比、絮凝时间。响应曲面法优化PAC去除高浓度硫酸钠溶液中F-建立的数学模型，其拟合值与验证实验结果的吻合度较高，絮凝沉淀前溶液含盐质量浓度为292.85 g/L、含F-质量浓度为70.58 mg/L，模型优化后最佳工艺参数：铝氟物质的量比为15.6，反应终点pH为7.6，絮凝时间为50 min，此时F-去除率为94.03%。经过多次实验验证得到，实际F-去除率均值为93.56%，F-去除率与模型预测值相差0.47%，净化后溶液中F-质量浓度可由70.58 mg/L降低至4.55 mg/L，说明模型优化条件准确性与可靠性高。
刘小文 , 李俊 , 周兆安 , 毛谙章 , 周爱青 . 响应曲面法优化PAC深度净化高浓度硫酸钠溶液中F-的研究[J]. 无机盐工业, 2024 , 56(6) : 67 -72 . DOI: 10.19964/j.issn.1006-4990.2023-0388
It was proposed to use polyaluminum chloride（PAC，similarly hereinafter） for deep purification of F- in high concentration sodium sulfate solution.The effects of molar ratio of aluminum to fluoride，reaction endpoint pH and flocculation time on the removal rate of F- were studied.The regression equation model obtained through the response surface method was used to predict the optimal experimental condition parameters for deep purification of F-.At the same time，the obtained response surface map and contour map were used to intuitively reflect the influence of various factors on the removal rate of fluoride ions and the strength of their interaction.The significant factors affecting the removal rate of fluoride ions from high to low were endpoint pH，molar ratio of aluminum to fluorine，and flocculation time.The response surface methodology was used to optimize the mathematical model established by PAC to remove fluoride ions from high concentration sodium sulfate solution.The fitting value was highly consistent with the validation test results.The stock solution contained 292.85 g/L of salt and 70.58 mg/L of fluoride ions.The optimal process parameters of model optimization：the molar ratio of aluminum to fluoride was 15.6，the endpoint pH was 7.6，and the flocculation time was 50 min.The removal rate of fluoride ions was 94.03%，which was verified by three tests.It was found that the actual average removal rate of fluoride ions was 93.56% after multiple experimental verifications.The difference between the removal rate of fluoride ions and the predicted value of the model was 0.47%.The fluoride ions in the liquid could be reduced from 70.58 mg/L to 4.55 mg/L after purification，indicating high accuracy and reliability of the model optimization conditions.
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