基于响应面法的粉煤灰氨含量测定过程浸提条件优化研究

针对粉煤灰氨含量的测定研究大多考虑单一因素,而忽略了在浸提过程中各因素间的交互作用对粉煤灰氨含量浸提的影响。以浸提剂浓度（A）、固液比（B）、振荡时间（C）作为考察因素,在单因素实验的基础上进行响应面实验,建立回归模型。通过响应面优化确定最佳的浸提工艺并与现有浸提方法的测定结果进行对比。结果表明,影响因素主次顺序为B、A、C、AB、BC、AC。最佳浸提工艺条件：浸提剂浓度为0.125 mol/L、固液比（质量体积比,g/mL,以下简称固液比）为1∶12.8、振荡时间为22 s。通过验证,发现实测值与预测值仅存在-2%的相对误差。相较现有浸提方法,优化后的浸提方法不仅使浸提时间大幅缩短,还使浸出率增加了73%~91%,为粉煤灰中氨含量的准确测定提供了新的方法与思路。

Study on optimization of extraction conditions in process of determination of ammonia content in fly ash based on response surface method

For the research on determination of ammonia content in fly ash,a single factor is mostly considered,but the influence of the interaction of various factors on the extraction of the ammonia content of fly ash during the extraction process is ignored.In this study,the extractant concentration（A）,solid-to-liquid ratio（B）,and oscillation time（C） were used as investigating factors,and a response surface test was conducted on the basis of single factor test to establish a regression model.The optimal extraction process was determined through response surface optimization and compared with the measurement results of existing extraction methods.The results showed that the order of influencing factors was B、A、C、AB、BC、AC.The best extraction process was extractant concentration of 0.125 mol/L,solid-liquid ratio （g/mL） of 1∶12.8,the oscillation time of 22 s.Through verification,it was found that there was only a relative error of -2% between the measured value and the predicted value.Compared with the existing extraction method,the optimized extraction method not only greatly shortened the extraction time,but also increased the extraction rate by 73% to 91%,which provided a new method and idea for the accurate determination of ammonia content in fly ash.