ABSTRACT Model for evaluation of the concentration of dissolved phosphorus (relative to the final pH of the
leaching solution) during leaching of iron oxide ore in oxalic acid solution has been derived. It
was observed that the validity of the model is rooted in the relationship lnP = N/a where both
sides of the expression are approximately equal to 4. The model depends on the value of the final
pH of the leaching solution which varies with leaching time. In all, the positive or negative
deviation of the model-predicted phosphorus concentration from its corresponding value
obtained from the experiment was found to be less than 22%, which is quite within the
acceptable deviation limit of experimental results hence establishing the validity and precision of
Cite this paper
C. Nwoye, "Model for Evaluation of the Concentration of Dissolved Phosphorus during Leaching of Iron Oxide Ore in Oxalic Acid Solution," Journal of Minerals and Materials Characterization and Engineering, Vol. 8 No. 3, 2009, pp. 181-188. doi: 10.4236/jmmce.2009.83016.
 Taxiarchour, M., Panias, D., Doumi, I., Paspaliaris, I., Kontopoulos, A. (1997a) Removal of Iron from Silica Sand by Leaching with Oxalic Acid, Hydrometallurgy, 46, 215-227.
Taxiarchou, M., Parnias, D., Douni, I., Paspaliaris, I., Kontopoulous, A. (1997b) Dissolution of Haematite in Acidic Oxalate Solutions. Hydrometallurgy, 44, 287-299.
Lee, S. O., Tran, T., Park Y.Y., Kim S.J., Kim, M. J. (2006) Study on the Kinetics of Iron Leaching by Oxalic Acid. Int. J. Miner Process,80, 144-152.
Panias, D.,Taxiarchou, M., Paspaliaris, I., Kontopoulos, A. (1996) Mechanism of Dissolution of Iron Oxides in Aqueous Oxalic Acid. Hydrometallurgy 42, 257-265.
Pinches, A. (1975) Bacterial Leaching of an Arsenic Bearing Sulphide Concentrate. The Institute of Mining and Metallurgy, England, 34.
Nwoye, C. I. (2008) Ph.D Thesis, Metallurgical and Materials Engineering Department, Federal University of Technology, Owerri, 178.
Nwoye, C. I. (2008) Model for Computational Analysis of Dissolved Haematite and Heat Absorbed by Oxalic Acid Solution during Leaching of Iron Oxide Ore, J. Eng.& App. Sc.,4, 22-25.
Turkdogan, E.T., Pearson, J. (1953) J. Iron and Steel Inst., 221, pp. 393-401.
Decker, A., Sevrin, R., Scimar, R. (1962) Open Hearth Proceedings, 45, pp. 421- 456.
Duke, D. A., Ramstad, H. F., Meyer, H. W. (1962) Open Hearth Proceedings, vol 45, pp.81-98.
Kootz,T., Neuhaus, H. (1961) Stahl u. Eisen, 81, pp. 1810-1815.
Kootz, K., Behrens,K., Maas, H., Baumgarten,. P. (1965) Stahl u. Eisen, 85, pp 857-865.
Edneral, F. P. (1979) Electrometallurgy of Steel and Ferro-alloys, MIR Publisher,5th edition Moscow. pp 30-239.
Zea,Y. K. (1945) J. Iron and Steel Inst., 151, pp. 459-504.
Nwoye, C. I. (2008) Model for predicting the Time of Dissolution of Pre-quantified Concentration of Phosphorus during Leaching of Iron Oxide Ore in Oxalic Acid, IJONAS,4(3):168-174.
Nwoye, C. I. (2006) SynchroWell Research Work Report, DFM Unit, No 2561178, 66-83. 
Nwoye, C. I., Agu, P. C., Mark, U., Ikele, U. S., Mbuka, I. E., and Anyakwo, C. N. (2008) Model for Predicting Phosphorus Removal in Relation to Weight of Iron Oxide Ore and pH during Leaching with Oxalic Acid Inter. J. Nat. Appl. Sc., 4(3): 106-112.
Anyakwo, C. N., and Obot, O.W. (2008) Phosphorus Removal from Nigeria`s Agbaja Iron Ore by Aspergillus niger, IREJEST 5(1), 54-58.
Nwoye, C. I. (2003) SynchroWell Research Work Report, DFM Unit, No 2031196, 26-60.