Dynamics of polymer-induced hetero-flocculation of wood fibres and fines

被引：18

作者：

Asselman, T ^{[1
]}

Garnier, G ^{[1
]}

机构：

[1] McGill Univ, Pulp & Paper Res Ctr, Dept Chem Engn & Paprican, Montreal, PQ H3A 2A7, Canada

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 174卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

hetero-flocculation; cationic poly(acrylamide); polymer transfer; flocculation dynamics;

D O I：

10.1016/S0927-7757(00)00626-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The kinetics of polymer-induced hetero-flocculation of wood fibres and fines was investigated. A polymer layer (cationic poly(acrylamide)) was deposited on either the fibres or the fines, and the fines concentration was followed after mixing both components. It is shown that the flocculation state is only transient. This is explained by a redistribution of polymer between surfaces upon particle detachment, which leads to a re-stabilisation of the system. Simultaneous particle deposition, particle detachment and polymer transfer determine the apparent particle detachment rate. The detachment rate is strongly shear-dependent, and the resulting polymer layers after redistribution have a reduced bridging ability compared to the fresh layers. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：297 / 306

页数：10

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