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Open AccessArticle

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

College of Mechanical & Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
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Minerals 2019, 9(4), 209; https://doi.org/10.3390/min9040209
Received: 28 February 2019 / Revised: 23 March 2019 / Accepted: 26 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Physical Separation and Enrichment)
The “entrainment of coarse particles in overflow” and the “entrainment of fine particles in underflow” are two inevitable phenomena in the hydrocyclone separation process, which can result in a wide product size distribution that does not meet the requirement of a precise classification. Hence, this study proposed a two-stage (TS) hydrocyclone, and the effects of the inlet velocity on the TS hydrocyclone were investigated using computational fluid dynamics (CFD). More specifically, the influences of the first-stage inlet velocity on the second-stage swirling flow field and the separation performance were studied. In addition, the particle size distribution of the product was analyzed. It was found that the first-stage overflow contained few coarse particles above 40 μm and that the second-stage underflow contained few fine particles. The second-stage underflow was free of particles smaller than 10 μm and almost free of particles smaller than 20 μm. The underflow product contained few fine particles. Moreover, the median particle size of the second-stage overflow product was similar to that of the feed. Inspired by this observation, we propose to recycle the second-stage overflow to the feed for re-classification and to use only the first-stage overflow and the second-stage underflow as products. In this way, fine particle products free of coarse particle entrainment, and coarse particle products free of fine particle entrainment can be obtained, achieving the goal of precise classification. View Full-Text
Keywords: two-stage (TS) hydrocyclone; computational fluid dynamics; separation performance; particle size; inlet velocity two-stage (TS) hydrocyclone; computational fluid dynamics; separation performance; particle size; inlet velocity
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Jiang, L.; Liu, P.; Zhang, Y.; Yang, X.; Wang, H. The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone. Minerals 2019, 9, 209.

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