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

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

Abstract

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

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

CLC Number:

TQ028.5

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.

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.

References

1	XIN Z, MENG L I. Synthesis of interconnected nanometer thick magnesium hydroxide platelets on porous magnesium substrate by hydrothermal method[J]. Journal of Synthetic Crystals, 2017, 46(2): 338-343.
2	LV Y, ZHANG Z, LAI Y Q, et al. Formation mechanism for planes (011) and (001) oriented Mg(OH)₂ films electrodeposited on SnO₂ coating glass[J]. CrystEngComm, 2011, 13(11): 3848-3851
3	MA H, CHEN Z X, MAO Z. Controlled growth of magnesium hydroxide crystals and its effect on the high-temperature properties of cotton/magnesium hydroxide composites[J]. Vacuum, 2013, 95:1-5.
4	ZHAO Y J, TAN Y, WONG F S, et al. Formation of Mg(OH)₂ dynamic membranes for oily water separation: effects of operating conditions[J]. Desalination, 2006, 191(1/2/3): 344-350.
5	DENG X, WANG Y, PENG J, et al. Mg(OH)₂/graphene nanocomposites prepared by cathodic electrodeposition for the adsorption of Congo red[J]. Nano: Brief Reports and Reviews, 2017, 12(2): 1750017(1-11.
6	向兰，吴会军，金永成，等. 阻燃型氢氧化镁制备技术评述[J]. 海湖盐与化工, 2001, 30(5): 1-4.
6	XIANG L, WU H J, JIN Y C, et al. Review on preparation technology of flame-retardant magnesium hydroxide[J]. Sea-Lake Salt and Chemical Industry, 2001, 30(5): 1-4.
7	李波, 李宁, 王寿江, 等. 絮凝剂对石灰乳法制备高纯氧化镁分离洗涤的影响[J]. 盐业与化工, 2011, 40(4): 8-10.
7	LI B, LI N, WANG S J, et al. The influence of separation and scrubbing from flocculant in preparation of high purity magnesium oxide by milk of lime method[J]. Journal of Salt Science and Chemical Industry, 2011, 40(4): 8-10.
8	李秀红. 片状氢氧化镁晶种的制备研究[J]. 安徽化工, 2011, 37(6): 31-35.
8	LI X H. Study on preparation of seeds of plate like magnesium hydroxide[J]. Anhui Chemical Industry, 2011, 37(6): 31-35.
9	余建川, 向兰, 金涌. 常温合成方式对Mg(OH)₂粒径及过滤性能的影响[J]. 昆明理工大学学报: 理工版, 2005, 30(4):96-98.
9	YU J C, XIANG L, JIN Y. Effect of slurry seed on size and filtration of Mg(OH)₂ particles[J]. Journal of Kunming University of Science and Technology (Science and Technology), 2005, 30(4): 96-98.
10	YANG Z, CAI J, ZHOU C G, et al. Effects of the content of silane coupling agent KH-560 on the properties of LLDPE/magnesium hydroxide composites[J]. Journal of Applied Polymer Science, 2010, 118(5): 2634-2641.
11	XU C H, WANG F, LIU D J, et al. Effect of additive EDTA on crystallization process of magnesium hydroxide precipitation[J]. Chinese Journal of Chemical Engineering, 2010, 18(5): 761-766.
12	向兰, 金永成, 魏飞, 等. 高分散片状氢氧化镁的制备方法: CN1401574A[P]. 2003-03-12.
12	XIANG L, JIN Y C, WEI F, et al. Process for preparing high dispersion flake magnesium hydroxide: CN1401574A[P]. 2003-03-12.
13	白俊红, 刘有智, 申红艳, 等. 表面改性对超细氢氧化镁过滤性能和沉降性能的影响[J]. 化工进展, 2013, 32(6): 1363-1366.
13	BAI J H, LIU Y Z, SHEN H Y, et al. Effect of the surface modification of superfine magnesium hydroxide on its filtration property and sedimentation property[J]. Chemical Industry and Engineering Progress, 2013, 32(6): 1363-1366.
14	李国珍, 殷海青, 祁正兴, 等. 不同因素对氢氧化镁晶体改性效果的研究[J]. 海南师范大学学报（自然科学版）, 2017, 30(2):166-170.
14	LI G Z, YIN H Q, QI Z X, et al. Study on the modification effect of different factors on magnesium hydroxide crystal[J]. Journal of Hainan Normal University (Natural Science), 2017, 30(2): 166-170.
15	孟红旗. 聚合氯化铝铁的性质和除藻应用研究[D]. 武汉: 武汉科技大学, 2004.
15	MENG H Q. Properties of polyaluminium ferric chloride and application of algal removal[D]. Wuhan: Wuhan University of Science and Technology, 2004.
16	夏天明. 水厂生产中影响絮凝剂用量因素的探讨[J]. 广东化工, 2017, 44(16): 87-88.
16	XIA T M. Discussion on factors influencing flocculant dosage in waterworks production[J]. Guangdong Chemical Industry, 2017, 44(16): 87-88.
17	赵朋龙, 邱旭勇, 陈念. 一种从硫酸盐型盐湖卤水中萃取氯化锂的方法: CN106044803B[P]. 2018-04-24.
17	ZHAO P L, QIU X Y, CHEN N. A method for extracting lithium chloride from sulfate brine: CN106044803B[P]. 2018-04-24.
18	HUANG P, YE L. Enhanced dewatering of waste sludge with polyacrylamide/montmorillonite composite and its conditioning mechanism[J]. Journal of Macromolecular Science B, 2014, 53(9): 1465-1476.
19	高濂, 孙静, 刘阳桥. 纳米粉体的分散剂表面改性[M]. 北京: 化学工业出版社, 2003: 34-36.
19	GAO W, SUN J, LIU Y Q. Surface modification of dispersants of nano-powders[M]. Beijing: Chemical Industry Press, 2003:34-36.

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