阳离子型聚丙烯酰胺对含超细氢氧化镁浆料过滤性能的影响

doi:10.16085/j.issn.1000-6613.2019-1631

化工进展 ›› 2020, Vol. 39 ›› Issue (7): 2775-2781.DOI: 10.16085/j.issn.1000-6613.2019-1631

阳离子型聚丙烯酰胺对含超细氢氧化镁浆料过滤性能的影响

曹俊雅¹(), 宋昱霖¹, 孙振华², 李少鹏²(), 李会泉²^,³

^1.中国矿业大学(北京)化学与环境工程学院，北京 100083
^2.中国科学院过程工程研究所绿色过程与工程重点实验室，湿法冶金清洁生产技术国家工程实验室，北京 100190
^3.中国科学院大学化学工程学院，北京 100049

出版日期:2020-07-05 发布日期:2020-07-10
通讯作者: 李少鹏
作者简介:曹俊雅（1981—），女，博士，副教授，硕士生导师。E-mail：caojy@cumtb.edu.cn。
基金资助:
国家重点研发计划(2018YFC1901802);中国科学院重点部署项目(ZDRWZS201812)

Effect of cationic polyacrylamide on the filtration performance of ultrafine magnesium hydroxide

Junya CAO¹(), Yulin SONG¹, Zhenhua SUN², Shaopeng LI²(), Huiquan LI²^,³

^1.School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China
^2.CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
^3.College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Online:2020-07-05 Published:2020-07-10
Contact: Shaopeng LI

摘要/Abstract

摘要：

为解决超细氢氧化镁颗粒细、易团聚导致的难过滤问题，本文考察了添加剂种类对含超细氢氧化镁浆料过滤性能的影响，系统研究了阳离子型聚丙烯酰胺加入方式、添加剂用量比、反应温度、反应时间和搅拌速率等因素对过滤速率的影响，采用X射线衍射仪（XRD）、热场发射扫描电子显微镜（SEM）对反应过程中得到的氢氧化镁晶体结构、形貌、粒度等进行表征分析，结合傅里叶红外光谱仪（FTIR）探究了聚丙烯酰胺分子与氢氧化镁晶体的结合机制，总结了阳离子型聚丙烯酰胺提高含超细氢氧化镁浆料过滤性能的机理。结果表明：阳离子聚丙烯酰胺的添加量为理论氢氧化镁质量的0.7%，反应温度60℃，搅拌速率250r/min，超细氢氧化镁浆料的过滤速率最大为545mL/(m²·s)，体系黏度最低为8.64mPa·s，氢氧化镁的平均粒径为138nm。过滤性能提高的机理为：阳离子聚丙烯酰胺中的酰胺基团与氢氧化镁分子中的羟基通过吸附架桥方式结合形成长链分子，使氢氧化镁颗粒之间分散性提高，减少相互间的团聚，提高整体过滤速率。

关键词: 氢氧化镁, 阳离子聚丙烯酰胺, 团聚, 过滤, 沉淀

Abstract:

In order to solve the problem of difficult filtration of ultrafine magnesium hydroxide particles due to the easy agglomeration of the fines, the effects of different kinds of additives on the filtration performance were investigated. The effects of cationic polyacrylamide concentration, addition mode, reaction temperature, reaction time and stirring rate on the filtration rate were systematically investigated. The crystal structure, morphology and particle size of the magnesium hydroxide crystals obtained were characterized by XRD and SEM. The binding mechanism of polyacrylamide molecules to magnesium hydroxide crystals was investigated by FTIR and the mechanism of cationic polyacrylamide to improve the filtration performance was summarized. The results showed that when the amount of cationic polyacrylamide was 0.7% of the theoretical mass fraction of magnesium hydroxide, the reaction temperature was 60℃, and the stirring rate was 250r/min, the filtration rate reached 545mL/(m²·s), and the viscosity of the magnesium hydroxide was 8.64mPa·s, with an average particle size of 138nm. The amide group in the cationic polyacrylamide and the hydroxyl group in the magnesium hydroxide molecule are connected by adsorption to form long-chain molecules, which improved the dispersibility between the magnesium hydroxide particles and avoided the agglomeration of the particles.

Key words: magnesium hydroxide, cationic polyacrylamide, agglomeration, filtration performance, precipitation

中图分类号:

TQ028.5

曹俊雅, 宋昱霖, 孙振华, 李少鹏, 李会泉. 阳离子型聚丙烯酰胺对含超细氢氧化镁浆料过滤性能的影响[J]. 化工进展, 2020, 39(7): 2775-2781.

Junya CAO, Yulin SONG, Zhenhua SUN, Shaopeng LI, Huiquan LI. Effect of cationic polyacrylamide on the filtration performance of ultrafine magnesium hydroxide[J]. Chemical Industry and Engineering Progress, 2020, 39(7): 2775-2781.

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阳离子型聚丙烯酰胺对含超细氢氧化镁浆料过滤性能的影响

Effect of cationic polyacrylamide on the filtration performance of ultrafine magnesium hydroxide

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