Features of near gravitational material tracers in a dense medium cyclone from PEPT

Narasimha, M (2023) Features of near gravitational material tracers in a dense medium cyclone from PEPT. Powder Technology, 415. p. 118095. ISSN 0032-5910

Text
pt_415-118095.pdf - Published Version
Download (4MB)

Abstract

Dense media cyclones are an integral part of circuits employed for coal processing, iron ore beneficiation, and recovery of diamonds. Many techniques have been applied in studying the separation performance of these devices including the use of different density tracers to develop density partition curves. This study focusses on tracking of near-gravity material radioactive tracers using the positron emission particle tracking technology. This near-gravity phase of coal has long been thought to cause separation inefficiencies which makes coal processing difficult. In this work, a slurry containing magnetite-based dense medium, and coal is pumped through a 100 mm Multotec cyclone. By means of the PEPT camera – apparatus with spatial and temporal resolutions of 1 mm and 1 ms respectively – and direct-adsorption-activated coal tracer particles within the medium, particle trajectories are recorded in space and time. The free vortex region is captured and shown to fit the Rankine vortex behaviour with n = 0.60 ± 0.08 overall for the free vortex power law decay. A logarithmic axial velocity model which captures the observed radial gradient around the locus of zero axial velocity is proposed. Radial profiles of turbulence intensity for the near gravitational material as captured by PEPT are presented.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Narasimha, M	http://www.orcid.org/0000-0002-3123-2811

Item Type:

Article

Uncontrolled Keywords:

Dense medium cyclone; Flow field; Near-gravity material; PEPT; Turbulence; adsorption; aquatic environment; Article; empiricism; Fourier transform; gamma radiation; geometry; gravity; human; image analysis; image quality; mathematical parameters; measurement accuracy; positron emission particle tracking; positron emission tomography; sea surface temperature; triangulation; Axial velocity; Coal processing; Dense medium cyclone; Different densities; Free vortices; Integral part; Near-gravity material; Partition curves; PEPT; Separation performance; coal; magnetite; tracer; Coal; Magnetite; Metal recovery; Vortex flow; Turbulence

Subjects:

Chemical Engineering
Chemical Engineering > Organic products

Divisions:

Department of Chemical Engineering

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

22 Aug 2023 05:29

Last Modified:

22 Aug 2023 05:29

URI:

http://raiithold.iith.ac.in/id/eprint/11585