Research progress of effect of grinding on surface properties of minerals and chemical properties of slurry solution
Grinding is a high energy-consuming process,and improving the grinding efficiency and reducing the energy consumption of grinding are the current research hotspots. Grinding as well as a complex physical and chemical process will change the surface properties of minerals and the chemical properties of the slurry solution,which in turn will have a significant impact on the flotation behavior of minerals. Firstly,the effects of mill type,media and mode on the surface properties of minerals were analyzed. Secondly,the applications of common grinding aids in the grinding process were summarized,and the relationship between the molecular structure of grinding aids and their grinding performance was analyzed. Finally,the effects of the grinding process on the chemical environment of the slurry solution and the rheological properties were summarized. The results show that changing the grinding conditions and environment (grinding method,materials and shape of grinding media,addition of grinding aids,etc.) can enhance the differences in the properties of mineral surface active sites,roughness,hydrophobicity,etc.,optimize the dissolved components of the slurry,regulate the rheology of the slurry,and achieve selective grinding. Adding suitable grinding aids in the grinding stage can optimize the particle size distribution of the grinding products and improve the grinding efficiency. At the same time,the grinding aids can form a synergistic effect with the flotation chemicals to improve the floatability of minerals. At present,the role of grinding aids and the influence of the subsequent mineral flotation system need be studied in depth. In the future,we should develop highly selective grinding aids to enhance the separation of minerals flotation by regulating the difference of mineral surface properties during the grinding process,changing the dissolved components of the slurry,and improving the dispersion and fluidity of the slurry.
grinding processflotation behaviormineral surface propertiesslurry solution chemical propertiesregulatory mechanisms
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维普
