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The agglomeration kinetics of aluminum hydroxide in Bayer process
, Article Powder Technology ; Volume 224 , July , 2012 , Pages 351-355 ; 00325910 (ISSN) ; Nattaghi, E ; Movahedirad, S ; Ranjbarian, S ; Farhadi, F ; Sharif University of Technology
2012
Abstract
The effects of temperature, seed mass and agitation rate on agglomeration kinetics of aluminum hydroxide in Bayer process have been studied in a batch system. Collected raw data were analyzed and the kinetics data of agglomeration were derived through simulation of the process using a pre-developed software. The results showed that agglomeration kinetics constant (agglomeration kernel) increases with increase in temperature and agitation rate. Moreover a maximum value of agglomeration rate versus added seed mass was observed. Furthermore the magnitude of calculated activation energy of agglomeration was close to that of growth
Bio-oxidation of ferrous ions by Acidithioobacillus ferrooxidans in amonolithic bioreactor
, Article Journal of Chemical Technology and Biotechnology ; Volume 84, Issue 4 , 2009 , Pages 504-510 ; 02682575 (ISSN) ; Alemzadeh, I ; Vossoughi, M ; Sharif University of Technology
2009
Abstract
Background: The bio-oxidation of ferrous iron is a potential industrial process in the regeneration of ferric iron and the removal of H2S in combustible gases. Bio-oxidation of ferrous iron may be an alternative method of producing ferric sulfate, which is a reagent used for removal of H2S from biogas, tail gas and in the pulp and paper industry. For practical use of this process, this study evaluated the optimal pH and initial ferric concentration. pH control looks like a key factor as it acts both on growth rate and on solubility ofmaterials in the system. Results: Process variables such as pH and amount of initial ferrous ions on oxidation by A. ferrooxidans and the effects of process...