Thermodynamic Modelling of Phosphate and Chloride Effects on Solid and Solution Phase Ferric Iron Speciation

Olli H. Tuovinen; Pauliina Nurmi; Lasse Ahonen

doi:10.4028/www.scientific.net/AMR.71-73.445

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 71-73Thermodynamic Modelling of Phosphate and Chloride...

Thermodynamic Modelling of Phosphate and Chloride Effects on Solid and Solution Phase Ferric Iron Speciation

Abstract:

The purpose of this study was to model, based on thermodynamic equilibrium constants, the effects of chloride and phosphate ion on the speciation of ferric iron in solution and on Fe(III)-precipitates. The thermodynamic modelling was based on the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. Increasing phosphate levels (g per L range) increase the complexation of ferric ion with phosphate (FeH2PO42+) with a parallel decrease in ferric sulphate complex (FeSO4+) and release of sulphate as SO42- in solution. Chloride ion at comparable levels and under otherwise similar conditions had negligible effects on the speciation of soluble iron species. In the solid phase analysis, jarosite and goethite species declined with increasing phosphate levels, whereas chloride did not affect the relative proportions of secondary Fe(III) minerals in the solid phase. Saturation index values for jarosites and goethite were dependent on the temperature with the range of phosphate levels (0–20 g/L) examine in this study.

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Advanced Materials Research (Volumes 71-73)

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445-448

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https://doi.org/10.4028/www.scientific.net/AMR.71-73.445

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Online since:

May 2009

Authors:

Olli H. Tuovinen, Pauliina Nurmi, Lasse Ahonen

Keywords:

Chloride Effect, Ferric Iron Speciation, Geochemical Modelling, Phosphate Effect

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References

[1] O.H. Tuovinen, P. Hiltunen and A. Vuorinen. Eur. J. Appl. Microbiol. Biotechnol. Vol. 17 (1983), p.327.

Google Scholar

[2] M.R. Hoffmann, P. Hiltunen and O.H. Tuovinen, in: Processing and Utilization of High Sulfur Coals, edited by Y.A. Attia, pp.683-698, Elsevier, Amsterdam (1985).

Google Scholar

[3] L. Harahuc, H.M. Lizama and I. Suzuki. Appl. Environ. Microbiol. Vol. 66 (2000), p.1031.

Google Scholar

[4] R.A. Jones, S.F. Koval and H.W. Nesbitt. Geochim. Cosmochim. Acta Vol 67 (2003), p.955.

Google Scholar

[5] S.R. Hutchins, M.S. Davidson, J.A. Brierley and C.L. Brierley. Annu. Rev. Microbiol. Vol. 40 (1986), p.311.

DOI: 10.1146/annurev.mi.40.100186.001523

Google Scholar

[6] J. Romero, C. Yañez, M. Vásquez, E.R.B. Moore and R.T. Espejo. Res. Microbiol. Vol. 154 (2003), p.353.

Google Scholar

[7] C.S. Davis-Belmar, J. Le C. Nicolle and P.R. Norris. Hydrometallurgy Vol. 94 (2008), p.144.

Google Scholar

[8] D.L. Parkhurst and C.A.J. Appelo: U.S. Geological Survey, Water-Resources Investigations Report 99-4259 (1999).

Google Scholar

[9] http: /wwwbrr. cr. usgs. gov/projects/GWC_coupled/phreeqc.

Google Scholar