摘要
利用煤矸石为原料制备聚硅酸氯化铝(PASC)絮凝剂,以PASC对煤泥水的去浊率为指标,通过单因素实验探究pH、聚合时间、聚合温度对PASC絮凝性能的影响,在此基础上进行响应面实验优化制备参数。利用XRD,FTIR,SEM和Zeta电位等测试方法对PASC进行理化表征,探究其絮凝机理。结果表明:响应面实验模型的相关系数R^(2)=0.9890,响应面优化模型可靠,在pH=3.32,温度44.3℃下聚合2.2 h,所得PASC对煤泥水的去浊率预测值为99.13%,3次验证实验显示PASC对煤泥水去浊率的平均值为99.11%,预测值与实验值仅有0.02%的误差;三因素按对煤泥水去浊率显著性由大到小依次为pH、聚合时间、聚合温度;XRD分析显示PASC中主要是NaCl衍射峰,非晶态衍射峰表明其形成了新的无定型聚合物,FTIR分析表明PASC内部存在Al—O—Si等多种成键作用,SEM分析表明PASC形貌呈高聚集度的簇团网状或分枝状结构;PASC为阳离子型无机高分子絮凝剂,粒度分布分析结果预示着PASC通过吸附电中和、吸附架桥以及网捕卷扫作用使得煤泥胶粒絮团,最终沉降。
Polysilicate aluminum chloride flocculant(PASC)was synthesized with coal gangue as raw material.The effects of pH,polymerization time and temperature on the performance of PASC were investigated by single factor test with the turbidity removal rate of coal slime water as indicator.Response surface experiment was carried out on this basis to optimize the preparation parameters.PASC was characterized by XRD,FTIR,SEM and Zeta potential to investigate its flocculation mechanism.The experimental results show that the correlation coefficient of response surface model is R^(2)=0.9890,indicating the reliability of the optimized response surface method.Under the conditions of pH=3.32,polymerization time 2.2 h and polymerization temperature 44.3℃,the predicted turbidity removal rate of coal slime water by PASC is 99.13%.The average turbidity removal rate of coal slime water by PASC is 99.11%in three verification tests,with only 0.02% deviation from the predicted value.The significant relationship of the three factors on the turbidity removal rate of coal slime water form large to small follows the order pH,polymerization time,polymerization temperature.The XRD analysis shows that the diffraction peak of NaCl is dominant in PASC,and the amorphous humps indicated that the new amorphous polymers were formed.The FTIR analysis reveals that multiple bonding processes,such as Al—O—Si,exist in PASC.The SEM analysis shows that the morphology of PASC has a high-aggregation cluster network and branched structure.PASC is a cationic inorganic polymer flocculant,and the distribution of particle size indicates that PASC can make coal slime colloidal aggregate through adsorption electric neutralization,adsorption bridge and net capture and sweep to realize settlement.
作者
宁琴
李彩霞
洪琰
王兴峰
张雨涵
孙得智
NING Qin;LI Caixia;HONG Yan;WANG Xingfeng;ZHANG Yuhan;SUN Dezhi(College of Mining,Liaoning Technical University,123000 Fuxin,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2023年第3期108-116,共9页
Coal Conversion
基金
辽宁省教育厅重点攻关项目(LJ2019ZL004)
辽宁省教育厅科研项目(LJKZ0328)
辽宁省自然资源厅科技创新项目(202420125)。
关键词
PASC
絮凝剂
响应面法
煤矸石
煤泥水
PASC
flocculant
response surface method
coal gangue
coal slime water
