Gas holdup and flotation rate

IF 5 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2025-09-12 DOI:10.1016/j.mineng.2025.109770

J.E. Nesset , Y.H. Tan , J.A. Finch

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Abstract

The paper has two parts. In the first, using flotation rate constant vs gas holdup data the suggestion that the high flotation rate in the Jameson^TM cell is due to the high gas holdup in the downcomer (up to 60 %) compared to flotation columns and mechanical cells (ca.15 %) is supported. However, the second part questions the reported gas holdup in mechanical machines arguing that gas holdup in the impeller zone (ε_gi) is the relevant metric. A method of estimating ε_gi exploiting dependence of power on aeration rate is introduced. Values of ε_gi comparable to the downcomer appear to be achieved. New mechanical machines that constrain the impeller zone in a separate chamber appear better able to exploit ε_gi to increase kinetics. An analogy is drawn with the downcomer representing a constrained jet environment. Arguing that the similarity between gas holdup in the downcomer and impeller zone should be reflected in similar bubble size, measurements in a Metso RCS^TM and Jameson^TM cell employing a modified gas superficial velocity did show similar trends.

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气含率和浮选率

本文分为两部分。首先，使用浮选速率常数与气含率的数据表明，james - ontm浮选池的高浮选率是由于下行塔的气含率（高达60%）高于浮选柱和机械浮选池（约15%）。然而，第二部分质疑在机械机器中报告的气含率，认为叶轮区域的气含率（εgi）是相关的度量。介绍了一种利用功率随曝气速率的变化来估计εgi的方法。似乎达到了与下行管相当的εgi值。将叶轮区限制在一个单独的腔室中的新型机械装置似乎能够更好地利用εgi来提高动力学。用表示受限射流环境的下水管作类比。认为下水管和叶轮区域的气含率的相似性应该反映在相似的气泡尺寸上，在Metso RCSTM和JamesonTM单元中使用改进的气体表面速度进行的测量确实显示出类似的趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.