Chi-g-CPAM絮凝高岭石的原位动力学和絮体形态研究

徐瑞景; 邹文杰; 饶博; 赵伟; 王廷; 张志军

doi:10.1007/s12613-022-2522-4

Volume 30 Issue 5

May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 813-823

Ruijing Xu, Wenjie Zou, Bo Rao, Wei Zhao, Ting Wang, and Zhijun Zhang, In situ kinetics and flocs conformation studies of kaolinite flocculated by Chi-g-CPAM, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 813-823. https://doi.org/10.1007/s12613-022-2522-4

Cite this article as:

Ruijing Xu, Wenjie Zou, Bo Rao, Wei Zhao, Ting Wang, and Zhijun Zhang, In situ kinetics and flocs conformation studies of kaolinite flocculated by Chi-g-CPAM, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 813-823. https://doi.org/10.1007/s12613-022-2522-4

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研究论文

Chi-g-CPAM絮凝高岭石的原位动力学和絮体形态研究

1)
北京科技大学金属矿山高效开采与安全教育部重点实验室，北京 100083，中国
2)
北京科技大学土木与资源工程学院，北京 100083，中国
3)
中国矿业大学(北京)化学与环境工程学院，北京 100083，中国

通讯作者:
邹文杰 E-mail: wjzou@ustb.edu.cn

文章亮点

(1) 开发了絮凝性能优异的Chi-g-CPAM絮凝剂并研究了其絮凝高岭石的机理。

(2) 对比了Chi-g-CPAM和CPAM絮凝高岭石时的原位吸附行为。

(3) 分析了Chi-g-CPAM和CPAM对高岭石的絮凝动力学和絮体构象变化规律。

中文摘要

本研究开发了一种高效絮凝剂——壳聚糖接枝阳离子型聚丙烯酰胺(Chi-g-CPAM)，并比较了其与商用阳离子聚丙烯酰胺(CPAM)对高岭石悬浊液的絮凝行为，分析了絮凝过程动力学以及相应的絮凝层形态变化规律。本文采用原子转移自由基聚合法(ATRP)在硅片上修饰了Chi-g-CPAM和CPAM，采用耗散型石英晶体微量天平进行了原位絮凝行为研究。结果表明Chi-g-CPAM絮凝高岭石的平衡时间仅是CPAM的0.46倍，且高岭石层的总质量更大。Chi-g-CPAM对高岭石的絮凝行为可较好的用动力学拟一阶模型模拟；CPAM絮凝高岭石的过程无法用单一模型来拟合，其初始阶段符合Elovich这一经验方程，反映了絮凝过程中活化能变化较大，这与CPAM的长链分子的架桥、卷扫作用有关。絮体形态研究表明，Chi-g-CPAM和高岭石形成的絮凝层较为致密(K₁ = 0.3513)且不随时间改变，CPAM初始阶段絮凝层构象松散(K₁ = 0.4663)，在800 min后观察到絮凝层构象逐渐塌陷(K₂ = 0.2026)。采用两种絮凝剂进行沉降实验，在用量为75 g/t时，Chi-g-CPAM处理的高岭石悬浊液上清液浊度和CPAM处理的相同，但沉降层厚度小于CPAM，说明Chi-g-CPAM和高岭石的絮凝絮团更致密，这和构象研究分析表现出一致性。该研究有助于更好地了解絮凝剂的絮凝行为，有助于开发用于选矿和尾矿处理的高效絮凝剂。

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Research Article

In situ kinetics and flocs conformation studies of kaolinite flocculated by Chi-g-CPAM

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Abstract

Abstract

This study presents a comparative study of the flocculation behavior of kaolinite induced by chitosan-graft-poly(acrylamide-dimethyl diallyl ammonium chloride) (Chi-g-CPAM) and a commercial cationic polyacrylamide (CPAM). The flocculation behaviour was characterised in terms of both flocculation kinetics and the corresponding morphology changes during flocculation. Both Chi-g-CPAM and CPAM were grafted from silica wafers by means of atom transfer radical polymerization (ATRP). The quartz crystal microbalance with dissipation (QCM-D) tests were conducted. The equilibrium time flocculated by Chi-g-CPAM was found to be 0.46 times as that of CPAM, together with a larger total mass of kaolinite layer. The flocculation behaviour by Chi-g-CPAM can be well captured by a pseudo-first-order model. In contrast, the presence of CPAM leads to a more complex kinetics. A relatively larger fitting slope (0.4663) was obtained at the initial stage but the fitting slope droped to 0.2026 after 800 min, indicating a densification process caused by CPAM. The flocculation kinetics of CPAM can be captured by the Elovich model for the inital stage but the combination of pseudo-first-order and pseudo-second-order models for the latter stages, which can be attributed to the long chain of CPAM. With a dosage of 75 g/t, the settling test with Chi-g-CPAM exhibits the same turbidity in the supernatant but a smaller layer thickness of the settlement compared to CPAM. The study enables a better understanding of the flocculation behavior and contributes to the development of efficient flocculants in mineral processing and tailings treatment.
- Chi-g-CPAM;
- flocculation;
- QCM-D;
- kinetics;
- conformation

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