University of Oulu

R. Hartmann, M. Rudolph, A. Ämmälä, M. Illikainen, The action of cellulose-based and conventional flotation reagents under dry and wet conditions correlating inverse gas chromatography to microflotation studies, In Minerals Engineering, Volume 114, 2017, Pages 17-25, ISSN 0892-6875, https://doi.org/10.1016/j.mineng.2017.09.004. (http://www.sciencedirect.com/science/article/pii/S0892687517302352) Keywords: Flotation; Inverse gas chromatography; Cellulose-based reagent; Surface heterogeneity characterisation

The action of cellulose-based and conventional flotation reagents under dry and wet conditions correlating inverse gas chromatography to microflotation studies

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Author: Hartmann, R.1; Rudolph, M.2; Ämmälä, A.1;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, 90570 Oulu, Finland
2Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, 09599 Freiberg, Germany
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201710058908
Language: English
Published: Elsevier, 2017
Publish Date: 2017-10-05
Description:

Abstract

The fundamental formation of the three phase contact in flotation is an intensively and controversially discussed phenomenon and the contact angle method is usually employed to characterise the wettability of solid surfaces. A more recent technique to explore the hydrophobicity of solid particulate phases is inverse gas chromatography (iGC) which is used to quantify the wettability of solid surfaces through thermodynamic parameters. In this article, the recently introduced net free energy of interaction between particles and bubbles immersed in water ΔGpwb is derived from the surface free energy analysis and its correlation to the flotability of solid phases is evaluated. At the same time, a more detailed analysis on the action of flotation reagents is presented performing iGC measurements under dry and flotation experiments under aqueous conditions. In general, flotation reagents have to satisfy required features to adsorb selectively, render the solid surface wetting property sufficiently, and comply current regulations concerning the preservation of the environment. Consequently, many conventional reagents are increasingly subjected to restrictions. One potential alternative candidate is nanocellulose due to the versatile chemical composition and functionality. The synthesis of cellulose nanocrystals (CNCs) includes different mechanical and chemical modification routes to lower the crystal sizes and integrate specific functional groups and organic components into the cellulose structure. This study is concentrated on the investigation of aminated CNCs for the flotation of quartz in comparison to conventional reagents. The employment of CNCs as a renewable and sustainable alternative to conventional chemicals is challenging due to the more complex structure of cellulose crystals and leads to new perspectives regarding the action of flotation reagents at the interface of a mineral under dry and wet environments.

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Series: Minerals engineering
ISSN: 0892-6875
ISSN-E: 1872-9444
ISSN-L: 0892-6875
Volume: 114
Pages: 17 - 25
DOI: 10.1016/j.mineng.2017.09.004
OADOI: https://oadoi.org/10.1016/j.mineng.2017.09.004
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Subjects:
Funding: Further, the authors would like to thank the Renlund Foundation for its financial support.
Copyright information: © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/)
  https://creativecommons.org/licenses/by-nc-nd/4.0/