University of Oulu

Raquel Lopéz, Helga Jordão, Robert Hartmann, Ari Ämmälä, M. Teresa Carvalho, Study of butyl-amine nanocrystal cellulose in the flotation of complex sulphide ores, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 579, 2019, 123655, ISSN 0927-7757,

Study of butyl-amine nanocrystal cellulose in the flotation of complex sulphide ores

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Author: Lopéz, Raquel1; Jordão, Helga1; Hartmann, Robert2;
Organizations: 1CERENA, Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais, 1049-001 Lisboa, Portugal
2Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, Helsinki, Finland
3Fibre and Particle Engineering Research Unit, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2021-07-08


Froth flotation is a widely used process for the beneficiation of complex sulphide ores. Thiol collectors (mostly xanthates) are usually effective collectors for sulphide minerals but may have a low selectivity between different sulphide minerals when associated in complex sulphide ores. Additionally, a concern is their suggested harmfulness on human health and impact on the environment. In this study, a green sustainable reagent, butyl-amine cellulose (BAC), was synthesized from hardwood kraft pulp, a renewable abundant resource, for the selective separation of chalcopyrite and sphalerite. The performance evaluation was made using samples of two ores containing chalcopyrite and sphalerite, one was from Panasqueira mine (Portugal) and the other with a different mineral association (from the massive sulphide deposits of the Iberian Pyrite Belt). The study demonstrated that when chalcopyrite is associated with sphalerite, BAC is selective for chalcopyrite, i.e., it is a collector for this mineral and not for sphalerite. The recovery of chalcopyrite in the floated product was a function of interaction between BAC concentration and pulp pH. The study showed that the novel cellulose-based collector had a better performance than the reagents used in the industrial flotation of Panasqueira ore.

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Series: Colloids and surfaces. A, Physicochemical and engineering aspects
ISSN: 0927-7757
ISSN-E: 1873-4359
ISSN-L: 0927-7757
Volume: 579
Article number: 123655
DOI: 10.1016/j.colsurfa.2019.123655
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Funding: This work was conducted as part of the ERA-MIN CELMIN-project supported by the Finnish Agency for Technology and Innovation (Business Finland), the Portuguese National Funding Agency for Science, Research and Technology (FCT) and the Executive Agency for Higher Education, Research, Development and Innovation Funding, Romania (UEFISCDI). The authors are grateful to CERENA, through the strategic Project UID/ECI/04028/2019, Sojitz Beralt Tin & Wolfram and to Rui Semeano for the contributions to the study.
Copyright information: © 2019 Elsevier B.V. All rights reserved.