响应曲面法优化GH3535平板样片中FLiNaK熔盐去污工艺条件

为了获得超声波和化学法联合去污LiF-NaF-KF(FLiNaK)熔盐的最佳工艺条件,利用响应曲面法和Box-Behnken设计(BBD)建立多项式模型,考察了反应温度、超声波功率、硝酸铝浓度和反应时间等因素对熔盐去除率的影响。结果显示:模型的相关系数r²为0.958 0,校正的相关系数r_adj²为0.915 9,表明模型的回归性显著,拟合程度高。影响熔盐去除率的因素由高到低为:反应时间>超声波功率>反应温度>硝酸铝浓度。预测的最佳去污工艺条件为:反应温度60℃、超声波功率300 W、硝酸铝浓度0.1 mol/L和反应时间9 min。在此条件下开展的去污实验验证熔盐的去除率为98.74%±1.12%(n=3),与预测值99.99%的相对误差为1.25%。表明采用响应曲面法优化超声波和化学法联合去污FLiNaK熔盐的工艺条件合理,结果可靠,可为下一步工程应用提供参考。

Optimization of FLiNaK Molten Salt Decontamination Condition Based on Response Surface Methodology

In order to obtain the optimum conditions of LiF-NaF-KF(FLiNaK) molten salt decontaminating by combination of ultrasonic and chemical method, response surface methodology and Box-Behnken design(BBD) are used to establish a polynomial model. The influences of different reaction temperature, ultrasonic wave power, the concentration of aluminum nitrate, and reaction time were explored. The determination coefficient(r²) and adjusted r²_adj of model are 0.958 0 and 0.915 9, respectively, which indicates the models has good agreements with experimental data. Results indicate that the impacts of factors on removal rate from strong to weak are reaction time, ultrasonic wave power, reaction temperature and the concentration of aluminum nitrate. The model predicts removal rate of molten salt of 99.99% with optimal condition of 60 ℃ of reaction temperature, 300 W of ultrasonic wave power, 0.1 mol/L of aluminum nitrate concentration and 9 min of reaction time. The experiment is carried out under the predicted optional condition, and the removal rate of 98.74%±1.12%(n=3) is obtained, and the average relative errors is 1.25%. The result can give reference for the next engineering applications.