Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 82, Issue -, Pages 167-176Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2011.09.007
Keywords
Poly(N-isopropylacrylamide); Flocculation; Temperature-responsive polymer; Consolidation
Categories
Funding
- Australian Research Council (Australian Mineral Science Research Institute) [LP0667828]
- AMIRA International [P924]
- BHP Billiton
- Rio Tinto
- Orica Explosives
- Anglo Platinum
- Xstrata Technology
- Freeport McMoran
- AREVA NC
- Australian Research Council [DP0879953]
- Australian Research Council [DP0879953] Funding Source: Australian Research Council
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The influence of pH and NaCl concentration on temperature-triggered flocculation and consolidation with poly(N-isopropyl acrylamide) (PNIPAM) has been studied for silica suspensions at 20 and 50 degrees C. The performance of PNIPAM has been compared to a commercial high molecular weight polyacrylamide flocculant (PAM). A region of optimal temperature-enhanced flocculation and consolidation with PNIPAM is identified. Batch settling tests, adsorption and electrokinetic studies reveal that PNIPAM performs best at medium to high magnitude of zeta potential, where the temperature-responsiveness of the polymer is maintained and the electrostatic contribution to interparticle attraction does not dominate. It is also shown that temperature-enhanced flocculation and consolidation with PNIPAM outperforms bridging flocculation with PAM under alkaline conditions. (C) 2011 Elsevier B.V. All rights reserved.
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