Flocculation of colloidal silica with polyacrylamide and the effect of dodecylamine and aluminium chloride pre-conditioning

被引：10

作者：

Baltar, CAM ^{[1
]}

Oliveira, JF ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, COPPE, Dept Met & Mat Engn, BR-21945 Rio De Janeiro, Brazil

来源：

MINERALS ENGINEERING | 1998年 / 11卷 / 05期

关键词：

flocculation; dewatering; fine particle processing;

D O I：

10.1016/S0892-6875(98)00026-0

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The stability of colloidal silica in the presence of polyacrylamide has been studied by electroacoustic potential measurements and sedimentation testwork. Prior conditioning with AlCl3.6H(2)O or dodecylamine resulted in more effective action of the polymer. Studies carried out by transmission electron microscopy (TEM) showed that the aggregates formed by AlCl3.6H(2)O addition were branched and larger than those formed by DDA, under similar experimental conditions. The polyacrylamide(PAM) adsorption on the two types of aggregates was induced by different mechanisms which affected the characteristics and resistance of the flocs. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：463 / 467

页数：5

共 7 条

[1]

BALTAR CAM, 1997, THESIS FEDERAL U RIO

[2]

BERGNA HE, 1994, ADV CHEM SER, V234, P1

[3]

HEALY TW, 1994, ADV CHEM SER, V234, P147

[4] Aggregation of colloidal silica by n-alkyl sulfates [J].

Kline, SR ;

Kaler, EW .

LANGMUIR, 1996, 12 (10) :2402-2407

[5] COLLOID STABILITY AND COMPLEX CHEMISTRY [J].

MATIJEVIC, E .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1973, 43 (02) :217-245

[6] THE USE OF POLYACRYLAMIDES IN MINERAL PROCESSING [J].

MOODY, G .

MINERALS ENGINEERING, 1992, 5 (3-5) :479-492

[7] MECHANISM OF ADSORPTION OF POLY(ETHYLENE OXIDE) FLOCCULANT ON SILICA [J].

RUBIO, J ;

KITCHENER, JA .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1976, 57 (01) :132-142

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