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On the impact of grinding conditions in the flotation of semi-soluble salt-type mineral-containing ores driven by surface or particle geometry effects?

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International Journal of Mining Science and Technology 2023年第7期33卷 855-872页

作者： Lucas Pereira Nathalie Kupka Duong Huu Hoang Bruno Michaux Sondos Saquran Doreen Ebert Martin Rudolph Helmholtz-Zentrum Dresden-Rossendorf Helmholtz Institute Freiberg for Resource TechnologyFreiberg 09599Germany Maelgwyn Mineral Services Ltd Cardiff CF244PAUnited Kingdom

Grinding and flotation processes are often studied independently, despite the well-established grinding influence on flotation performance, which affects not only particle size and thus liberation but also shape and leads to complex changes in pulp chemistry affecting the particle surface properties relevant for selective bubble attachment. Yet, no study jointly investigated these possible causes and many are limited to single mineral flotation. We relate grinding conditions to changes in pulp chemistry and particle surface properties and assess their impact on upgrading. We studied three non-sulfide ores with different feed grades and valuables: scheelite, apatite, and fluorite. These were dry-, wet-, and wet conditionedground before flotation in a laboratory mechanical cell. Results were evaluated with bulk-and particle-specific methodologies. The selectivity of the process is higher after dry grinding for the fluorite and apatite ores and irrelevant for the scheelite ore. Variations in flotation kinetics of individual particles associated to their size and shape are not sufficient to explain these results. The higher concentration of Ca2+and Mg2+observed in the pulp after wet grinding, altering particle surface properties, better explains the phenomenon. Additionally, we demonstrate how particle shape impacts are system specific and related to both entrainment and true flotation.

关键词： Grinding-flotation interactions Semi-soluble salt-type minerals Geometallurgy particle-based separation modelling Surface interactions

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Testing the robustness of particle-based separation models for the magnetic separation of a complex skarn ore

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International Journal of Mining Science and Technology 2022年第3期32卷 645-655页

作者： Lucas Pereira Max Frenzel Markus Buchmann Marius Kern Raimon Tolosana-Delgado K.Gerald van den Boogaart Jens Gutzmer Hemholtz-Zentrum Dresden-Rossendorf Helmholtz Institute Freiberg for Resource Technology09599 FreibergGermany German Aerospace Center Institute of Low-Carbon Industrial Processes03046 CottbusGermany TU Bergakademie Freiberg Institute for Stochastics09599 FreibergGermany

Physical separation processes are best understood in terms of the behaviour of individual ore ***,while different empirical particle-based separation modelling approaches have been developed,their predictive performance has never been tested under variable process ***,we investigated the predictive performance of a state-of-the-art particle-based separation model under variable feed composition for a laboratory-scale magnetic separation of a skarn *** scenarios were investigated:one in which the mass flow of the different processing streams could be measured and one in which it had to be estimated from *** both scenarios,the predictive models were sufficiently general to predict the process outcomes of new samples of variable ***,the scenario in which mass flow could be measured was4%more precise in predicting mass *** process behaviour of minerals present at concentrations above 0.1%by weight could be accurately *** findings indicate the potential use of this method to minimize the costs of metallurgical testwork while providing in-depth understanding of the recovery behaviour of individual ore ***,the method may be used to establish powerful tools to forecast mineral recoveries for partly new ore types at a running mining operation.

关键词： Metallurgical tests particle-based separation modelling Magnetic separation Cassiterite recovery

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