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

作     者：Lucas Pereira Nathalie Kupka Duong Huu Hoang Bruno Michaux Sondos Saquran Doreen Ebert Martin Rudolph Lucas Pereira;Nathalie Kupka;Duong Huu Hoang;Bruno Michaux;Sondos Saquran;Doreen Ebert;Martin Rudolph

作者机构：Helmholtz-Zentrum Dresden-RossendorfHelmholtz Institute Freiberg for Resource TechnologyFreiberg 09599Germany Maelgwyn Mineral Services LtdCardiff CF244PAUnited Kingdom 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2023年第33卷第7期

页      面：855-872页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学] 

基　　金：The Zeitenwende project  financed by the Helmholtz Association  is responsible for funding the work of some of the authors in this study 

主　　题：Grinding-flotation interactions Semi-soluble salt-type minerals Geometallurgy Particle-based separation modelling Surface interactions 

摘      要：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.