University of Oulu

Ludovici, F., C.B. de Carvalho, A. L., Hartmann, R., and Liimatainen, H.: Functionalized nanocelluloses as bio-based chemicals in froth flotation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12333,, 2021.

Functionalized nanocelluloses as bio-based chemicals in froth flotation

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Author: Ludovici, Feliciana1; de Carvalho, Ana Luiza C.B.2; Hartmann, Robert3;
Organizations: 1Fiber and Particle Engineering Research Unit, University of Oulu, P. O. Box 4300, FI-90014 Oulu, Finland
2Department of Mineral and Waste Processing, Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Technical University of Clausthal, Clausthal-Zellerfeld, Germany
3Department of Chemical and Metallurgical Engineering, Aalto University, P.O. Box 11000, FI-00076 Espoo, Finland
Format: abstract
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.1 MB)
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Language: English
Published: European geosciences union, 2021
Publish Date: 2021-05-05


Froth flotation is the most common process in the mining industry for the beneficiation of complex sulfide ores. For this purpose, thiol collectors (mostly xanthates) are typically used as flotation chemicals because of their efficacy. However, concerns for their effect on human health and negative impact on the environment increasingly urge for alternative candidates. Consequently, there are great ecological and economical interests to develop novel green chemicals from renewable resources to overcome the inherent environmental and health problems associated with traditional petroleum-derived mining chemicals. Cellulose, which is the most abundant natural polymer resource, represents a green alternative raw material to develop sustainable chemicals that could replace currently used synthetic additives. In the present work, we introduce a novel environmentally friendly and industrially feasible process to produce selective froth flotation chemicals. Therefore, the pulp fibers were disintegrated to cellulose nanoparticles and further functionalized with a silylation reaction in aqueous conditions. Two different functional groups were incorporated into the cellulose nanoparticles and subsequently investigated, namely a thiol-functional moiety, which has an affinity towards pyrite ore surfaces, or an amine-functional moiety, which has an affinity towards silica surfaces. Microflotation tests were carried out in a Hallimond tube to study the flotability of pure pyrite or quartz as a function of pH value, collector concentration, flotation time, and gas flow rate using the novel green nanoparticles, and their results were compared with commercial xanthate and amine chemicals.

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Article number: 12333
DOI: 10.5194/egusphere-egu21-12333
Host publication: EGU General Assembly 2021, online, 19–30 Apr 2021
Conference: EGU General Assembly
Field of Science: 1171 Geosciences
218 Environmental engineering
Funding: MSCA-ETN SULTAN H2020 No 812580.
EU Grant Number: (812580) SULTAN - European Training Network for the remediation and reprocessing of sulfidic mining waste sites
Copyright information: © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.