Study on Solid Suspension Characteristics in a Laboratory-Scale Slurry Electrolysis Stirring Tank

IF 2.5 3区 材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Tingting Lu, Zhengbiao Hu, Hongliang Zhao, Shuai Deng
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Abstract

Slurry electrolysis (SE) is a hydrometallurgical technology that offers notable advantages in the efficient extraction of metals from complex minerals while minimizing carbon emissions. This study aimed to investigate the characteristics of solid suspension within a 1:6 scaled cold water model, employing a combination of high-speed imaging and fiber probe measurements. The effects of stirring speed (N, 60–200 rpm), solid mass concentration (c, 175–357 g/L), liquid level height (H, 270–330 mm) on the clear liquid layer, axial and radial solid concentrations, and tank homogeneity were assessed. It was found that the flow was smooth at the solid–liquid interface, with the absence of significant vortexes formations at the center. On the horizontal plane, the distribution of solid concentration was observed to be uniform in the middle region, gradually increasing toward the edges. Notably, when the stirring speed reached N = 200 rpm, the tank achieved uniform suspension, which corresponds to a speed range of 33–52 rpm in the SE prototype. The relationship between stirring speed and solid concentration was analyzed, showing that the interaction between particles cannot be ignored. Furthermore, increasing the liquid level contributes to reducing fluctuation in the liquid surface, the tank exhibited the highest level of homogeneity when the liquid level height was set to H = 300 mm.

Graphical Abstract

Abstract Image

实验室规模浆料电解搅拌槽中的固体悬浮特性研究
泥浆电解(SE)是一种湿法冶金技术,在从复杂矿物中高效提取金属方面具有显著优势,同时还能最大限度地减少碳排放。本研究采用高速成像和纤维探针测量相结合的方法,旨在研究 1:6 比例冷水模型中固体悬浮物的特性。研究评估了搅拌速度(N,60-200 rpm)、固体质量浓度(c,175-357 g/L)、液面高度(H,270-330 mm)对透明液层、轴向和径向固体浓度以及水槽均匀性的影响。结果发现,固液界面处的流动平稳,中心没有明显的涡流形成。在水平面上,观察到固体浓度在中间区域分布均匀,向边缘逐渐增加。值得注意的是,当搅拌速度达到 N = 200 rpm 时,罐内的悬浮液达到均匀,这与 SE 原型中 33-52 rpm 的速度范围相对应。分析了搅拌速度与固体浓度之间的关系,结果表明颗粒之间的相互作用不容忽视。此外,提高液面高度有助于减少液面波动,当液面高度设定为 H = 300 毫米时,罐体表现出最高的均匀度。
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来源期刊
Journal of Sustainable Metallurgy
Journal of Sustainable Metallurgy Materials Science-Metals and Alloys
CiteScore
4.00
自引率
12.50%
发文量
151
期刊介绍: Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.
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