The fluidized flotation technology is a new technology for coarse particle separation,the kinetic separation process and revealing the coarse particle recovery enhancement mechanism can lay a theoretical foundation for regulating the coarse particle fluidized separation process.A laboratory-scale fluidization flotation test system was established.Employing techniques,such as electrical resistance tomography (ERT),high-speed imaging,and deep slot sampling,the axial concentration distribution of the bed at different rising water velocities (8 L/min,10 L/min and 12 L/min) was systematically studied.The results show that the fluidized glass beads display a stable concentration profile,consistently declining distribution from the bottom to the top of the column,the mid-bed concentration significant decrease with the height increasing.Additionally,a "four-zone" kinetic process of coarse particle fluidization flotation was proposed,elucidating the mineralization separation mechanisms in both the dilute and dense phases.In the dilute phase,the separation process is marked by "Flotage-Gravity" coupling,which relies on froth flotation in a microgravity environment.In contrast,the dense phase operates through "Gravity-Flotation" coupling,which is driven by gravitational separation dictated by density differences.A model for calculating the stability of mineralized aggregates was established,allowing for the derivation of the maximum particle size (Rmax) under conditions of stable existence of mineralized aggregate,which theoretically proves that the upper limit of flotation particle size for fluidized flotation is 1.5-1.8 times greater than that of traditional mechanical agitation flotation.
关键词
粗颗粒/流态化浮选/动力学分区/电阻层析成像/气絮体稳定性模型
Key words
coarse particle/fluidized flotation/kinetic zoning/electrical resistance tomography/aggregates stability model
维普
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