Evaluation of the applicability of ultrasonic velocity profiling in conditions related to wet low intensity magnetic separation
2014 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 62, 2–8- p.Article in journal (Refereed)
The internal material transport and selection processes of the wet low-intensity magnetic separators (LIMS) are poorly understood; this calls for improved measurement techniques. In this work an ultrasonic velocity profiling (UVP) technique for measuring how material flow velocity varies with penetration depth is presented. A measurement depth of just a couple of centimetres would greatly improve the understanding of the separation process in a LIMS.When applied to flows of mineral suspensions with high volumetric solids concentration, similar to those in the separators, UVP is unique in combining:•Non-intrusive measurements.•Operates using just one sensor element (transducer).•Relatively good spatial resolution.•Penetrates opaque suspensions.•Fast sampling rate.Here, flows are studied in a rectangular duct (50 × 75 mm). Using magnetite suspensions, measurement through the whole depth of 50 mm is made with good accuracy. Velocity profiles are presented for solids concentrations of 5% and 9% solids by volume (20% and 36% by weight). Even at 9 vol% solids it is possible to reach a penetration depth of more than 25 mm.
Place, publisher, year, edition, pages
2014. Vol. 62, 2–8- p.
Research subject Mineral Processing; Signal Processing
IdentifiersURN: urn:nbn:se:ltu:diva-34223DOI: 10.1016/j.mineng.2013.08.005Local ID: 85bc02d8-5f44-4464-8b11-7f440262931fOAI: oai:DiVA.org:ltu-34223DiVA: diva2:1007473
Physical Separation '13 : 20/06/2013 - 21/06/2013
ProjectsWet LlMS - Measurements and models
Validerad; 2014; 20130821 (janste); Konferensartikel i tidskrift2016-09-302016-09-30Bibliographically approved