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调浆是浮选过程中影响后续分选段作业效率的关键环节之一,对二折叶桨式叶轮、四折叶开启式涡轮、四直叶开启式涡轮以及推进式叶轮等搅拌叶轮及其与导流筒、挡板的组合进行功率准数(NP)及混合时间数(Nθ)等特性参数的研究.结果表明:径流式叶轮相对轴流式叶轮,NP较大,能耗较高,而Nθ较小,更容易快速混合;导流筒可以节省能耗,加快混合;挡板则增加能耗,减小混合速率,对径流式叶轮作用流场影响更大,四直叶开启式涡轮的NP增加5倍以上,Nθ增加38%;同功耗下单叶轮以四折叶开启式涡轮的混合时间最短,混合效率最高.通过典型流场的数值模拟,解析了相应的搅拌特性.
Mixing is the flotation process affecting the efficiency of the subsequent separation section, one of the key aspects of the efficiency of the two leaves impeller impeller, open four leaves open turbine, four straight open impellers impeller impeller impeller and its (NP) and mixing time (Nθ) were studied.The results show that the radial impeller has larger NP and higher energy consumption than the axial flow impeller, Nθ is smaller and easier to mix quickly; the draft tube can save energy and speed up the mixing; the baffle increases the energy consumption, reduces the mixing rate and has a greater influence on the flow field of the radial impeller, NP increased by more than 5 times and Nθ increased by 38%. The mixing time of the single-impeller with four-fold leaf opening turbine was the shortest and the mixing efficiency was the highest under the same power consumption.The corresponding agitation characteristics were analyzed by the numerical simulation of typical flow field.