Autors: Petrova T. M., Tzaneva, B. R., Fachikov L.B., Hristov J.
Title: Silver recovery from spent photographic solutions by a magneticallyassisted particle bed
Keywords: silver cementation, thiosulphate solution, magnetic field

Abstract: The work presents experimental results on silver cementation from spent photographic fixer thiosulphatesolutions by iron in magnetically controlled particle beds. Axial magnetic field created by Helmholtz pairwas used. The increase in the fluid flow rate yields an increased silver recovery due to reduction inthe external mass transfer resistance irrespective of the particle bed structures used for cementation.The field intensity slightly boosts the silver recovery and results in granular structures appearing at thesurface of the deposits. The bed structures when the iron is used as a particle beds in column operationhas major role in the efficient performance of the cementation process. With flow rate slightly exceedingthe minimum fluidization point in the absence of a field the preferable operating regimes are: a fixedbed (FB) and moderately expanded magnetically stabilized beds (MSB) regimes, both of them with theMagnetization FIRST mode. However, when high flow throughputs are req

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    Issue

    Chemical Engineering and Processing, vol. 71, pp. 83-96, 2013, Switzerland, Elsevier Science, ISSN 0255-2701

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    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus