基于Box-Behnken响应面法优化无水磷石膏疏水改性工艺  

Optimization of Hydrophobic Modification Process of Anhydrous Phosphogypsum Based on Box-Behnken Response Surface Methodology

作　　者：刘浩 聂晨晨 李宏萍 周俊 杨兰文 谢贵明[1,2] LIU Hao;NIE Chenchen;LI Hongping;ZHOU Jun;YANG Lanwen;XIE Guiming(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Guizhou Province for Green Chemical Industry and Clean Energy Technology,Guiyang 550025,China)

机构地区：[1]贵州大学化学与化工学院,贵阳550025 [2]贵州省绿色化工与清洁能源技术重点实验室,贵阳550025

出　　处：《硅酸盐通报》2022年第10期3599-3607,共9页Bulletin of the Chinese Ceramic Society

基　　金：贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2021]091);贵州大学培育项目([2020]64)。

摘　　要：磷石膏(PG)是磷酸湿法工艺中产生的固体废渣,大量堆存造成环境污染。PG经球磨和煅烧处理得到的无水磷石膏(APG)再经表面疏水改性后可用作高分子材料的填料,在材料中起到增韧、增强作用,提高材料的综合力学性能,成为PG资源化利用的一种有效途径。以APG为主要原料,以活化指数为响应值,通过单因素试验和响应面法对APG疏水改性工艺条件进行优化。结果表明,响应曲面建立的数学模型拟合度较高,NaOH浓度、KH570添加量和反应时间3个因素对活化指数均有显著影响,其中KH570添加量是影响改性效果的主要因素。APG最优疏水改性条件为:NaOH浓度2.6 mol/L,KH570添加量3.10 g,反应时间149 min。最优条件下改性APG的活化指数为0.968 9,接触角为84.51°。Phosphogypsum(PG) is an industrial solid waste produced in the wet process of phosphoric acid, which piles up in large quantities and pollutes the environment. However, anhydrous phosphogypsum(APG) obtained by PG after ball milling and calcination can be used as filler for polymer materials after hydrophobic modification on the surface, to improve the comprehensive mechanical properties of the materials by toughening and strengthening the materials, and it is an effective way for the resource utilization of PG. In this study, taking APG as the main raw material and the activation index as the response value, the process conditions of hydrophobic modification of APG were optimized by single factor test and the response surface methodology. The results show that the mathematical model established by the response surface has a high fitting degree. NaOH concentration, KH570 dosage and reaction time have significant effects on the activation index, and the dosage of KH570 is the main factor affecting the modification. The optimal hydrophobic modification conditions of APG are as follows: NaOH concentration is 2.6 mol/L, KH570 dosage is 3.10 g, and the reaction time is 149 min. Under the optimal conditions, the activation index and contact angle of the modified APG are 0.968 9 and 84.51°, respectively.

关 键 词：响应面法 无水磷石膏 填料 改性 活化指数 疏水 工艺优化 

分 类 号：X705[环境科学与工程—环境工程]