基于Box-Behnken响应面法的钠离子吸附剂的制备工艺条件优化

赤泥中含有一定量的钠离子,这对赤泥应用性能影响很大。本研究通过制备吸附剂来分离钠离子,应用Design-Expert软件响应面法中的Box-Behnken程序,对吸附剂的制备工艺条件进行优化研究。通过单因素试验,以钠离子去除率为评价指标,确定了煅烧温度、煅烧时间和Al掺量三因素的适宜范围。在此基础上,利用Box-Behnken中心组合试验,以钠离子去除率为响应值进行响应面分析,对制备工艺条件进行优化。结果表明,最佳制备条件为煅烧温度400 ℃,煅烧时间5 h,Al掺量40%。在此条件下,钠离子去除率为95.30%,这为赤泥中钠离子的分离提供了一种方法。

Optimization of Preparation Process Conditions for Sodium Ion Adsorbent Based on Box-Behnken Response Surface Methodology

Red mud contains a certain amount of sodium ion, which has a great impact on red mud’s application performance. In this study, an adsorbent was prepared to separate sodium ion, and the Box-Behnken program in the response surface methodology of the Design-Expert software was used to optimize the preparation conditions of the adsorbent. The appropriate range of three factors including calcination temperature, calcination time and Al content was determined by single factor experiment with sodium ion removal rate as the evaluation index. On this basis, though the Box-Behnken center combined test, the response surface analysis was carried out with the sodium ion removal rate as the response value, and the preparation process conditions were optimized. The result shows that the optimal preparation conditions are calcination temperature of 400 ℃, calcination time of 5 h, and Al content of 40%. Under these conditions, the sodium ion removal rate is 95.30%, which provides a method for the separation of sodium ions in red mud.