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vol.108 número10Applications of electrical tomography to improve the performance of crystallization, precipitation and mixing processesThree-dimensional measurement and simulation of the dewatering behavior of flocs and sediments using X-ray microtomography índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717

Resumo

WILLIAMS, R.A.  e  VILAR, G.. Measurement of suspension velocity in slurries and pastes using impedance imaging. J. S. Afr. Inst. Min. Metall. [online]. 2008, vol.108, n.10, pp. 597-605. ISSN 2411-9717.

Electrical impedance tomographic methods have been applied to a variety of mineral and chemical processes in the laboratory and on plant. This review paper surveys technical developments in measurement methods to enable quantitative extraction of key process information in the form of mapping of concentration profiles, mixture homogeneity and suspension velocity. The methods for determining velocity are summarized, since this is of especial interest when applied to opaque systems where most conventional optically based measurements fail. A recent significant development is the use of ultra-high speed measurement that now allows velocity vectors to be extracted for fast moving mixtures and fluids (up to several metres per second). New data are reported pertinent to low and high solids concentration flow in pipelines. Use of the methods offer improvements to design of such systems but also points to the use of tomographic electrical sensor as online flow measurement and fault detection. This offers new opportunities for applications and benefits in the design and monitoring of mineral slurries and sludges.

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