FLOCCULATION OF HEMATITE FINES BY ANIONIC POLYACRYLAMIDE POLYMERS

被引：17
|
作者：
KHANGAONKAR, PR [1 ]
SUBRAMANI, KJB [1 ]
机构：
[1] NATL MET LAB,MADRAS CTR,MADRAS 600113,INDIA
来源：
MINERALS ENGINEERING | 1993年 / 6卷 / 07期
关键词：
FLOCCULATION; HEMATITE; PAN POLYMERS;
D O I：
10.1016/0892-6875(93)90007-A
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Flocculation studies on iron-ore fines (size < 10 mum) were conducted using three anionic polyacrylamide polymers over the pH range 4.0 - 10.0 and flocculant dosages up to 0.20 kg/ton. The flocculation was favourable under acidic conditions and was helped substantially by CaCl2 additions in alkaline conditions. Zeta potential measurements indicated a specific adsorption of polymers. Adsorption studies on the system indicated a pseudo-Langmuir type isotherm. Specific free energy of adsorption was estimated to be -26 to -34 kJ/mole for the three flocculants. Hydrogen bonding and electrostatic forces mainly appeared to influence flocculation in the system studied. Selective flocculation of iron-ore-silica fines mixtures was favourable with the above polymers, with the help of sodium silicate.
引用
收藏
页码：765 / 774
页数：10
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