University of Oulu

A. Tanhua, M. Peltoniemi, R. Kallio, S. Peräniemi, S. Luukkanen, The effects of dry grinding and chemical conditioning during grinding on the flotation response of a Cu-Zn sulphide ore and a spodumene pegmatite silicate ore, Minerals Engineering, Volume 189, 2022, 107865, ISSN 0892-6875,

The effects of dry grinding and chemical conditioning during grinding on the flotation response of a Cu-Zn sulphide ore and a spodumene pegmatite silicate ore

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Author: Tanhua, A.1; Peltoniemi, M.1; Kallio, R.1;
Organizations: 1Oulu Mining School, University of Oulu, Linnanmaa Campus, Pentti Kaiteran katu 1, P.O. Box 8000, FI-90014 Oulu, Finland
2Analytical Unit of the School of Pharmacy, University of Eastern Finland, Kuopio, Kuopio Campus, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.2 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2023-07-04


Dry processing of metal containing ores is often easily discarded as a viable option because of the higher energy consumption of dry grinding and several other challenges introduced from the handling of the dry ore. However, possible positive aspects include improved surface properties, reduced wear of the grinding media, and improved efficiency of water usage, which will become increasingly important in the future due to the water scarcity and global warming.

Laboratory scale flotation tests with various grinding and conditioning methods were conducted with the Pyhäsalmi massive sulphide ore (Cu-Zn) and the Syväjärvi spodumene pegmatite silicate ore (Li) to determine the effects of dry processing on the flotation performance of these ores. Products were characterized utilizing XRF and MP-AES, and metallurgical efficiency was assessed. EDTA-leaching of the grinding products, and electrochemical measurements were conducted to further assess the chemical conditions after various processing atmospheres.

Dry grinding the Pyhäsalmi sulphide ore resulted in higher flotation mass recoveries compared to wet grinding, but at the cost of selectivity. Beneficial effects emerging from the chemical conditioning during grinding were observed regarding kinetics, selectivity, and overall performance. Conditioning the Syväjärvi spodumene ore with a fatty acid collector during dry grinding had a tremendous activating effect on the ore, and detrimental effect on the selectivity. Overall, the spodumene ore responded poorly to the dry processing conditions, but some potential applications were identified.

These initial results showed clear differences in the separation performance between the various grinding and conditioning conditions, and future efforts will be focused on determining the effects of these different processing conditions on the mineralś surface properties in a more precise manner.

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Series: Minerals engineering
ISSN: 0892-6875
ISSN-E: 1872-9444
ISSN-L: 0892-6875
Volume: 189
Article number: 107865
DOI: 10.1016/j.mineng.2022.107865
Type of Publication: A1 Journal article – refereed
Field of Science: 222 Other engineering and technologies
Funding: The authors would like to thank the K.H. Renlund Foundation for providing a grant that was used to fund the project́s analysis and equipment rent costs.
Copyright information: © 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (