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C.J. Menendez, V.L. Barone, I.L. Botto and E.L. Tavani, Physicochemical characterization of the chlorination of natural wolframites with chlorine and sulphur dioxide , Minerals Engineering, Vol.20 No.14, 2007

S. Hairunnisha, G.K. Sendil, J. Prabhakar Rethinaraj, G.N. Srinivasan, P. Adaikkalam and S. Kulandaisamy, Studies on the preparation of pure ammonium para tungstate from tungsten alloy scrap, Hydrometallurgy, Vol.85 No.2-4, 2007

J.I. Martins, Jose L.F.C. Lima, A. Moreira and S.C. Costa, Tungsten recovery from alkaline leach solutions as synthetic scheelite, Hydrometallurgy, Vol.85 No.2-4, 2007

Guar, R.P.S., Modern Hydrometallurgical Production Methods for Tungsten, JOM, Vol.58 No.9, 2006

Razavizadeh, H., and Iangroudi, A.E., Production of tungsten via leaching of scheelite with sulfuric acid, Minerals & Metallurgical Processing, Vol.23 No.2, 2006

C. Kahruman, I. Yusufoglu, Leaching kinetics of synthetic CaWO₄ in HCl solutions containing H₃PO₄ as chelating agent, Hydrometallurgy, Vol.81 No.3-4, 2006

Srinivas, K., et al, Studies on the application of alkyl phosphoric acid ester in the flotation of wolframite. Mineral Processing and Extractive Metallurgy Review, Vol.25 No.4, 2004

Sreenivas, T., et al, An integrated process for the recovery of tungsten and tin from a combined wolframite-scheelite-cassiterite concentrate. Mineral Processing and Extractive Metallurgy Review, Vol.25 No.3, 2004

L. Luo, L. Kejun, A. Shibayama, W. Yen, T. Fujita, O. Shindo, A. Katai, Recovery of tungsten and vanadium from tungsten alloy scrap. Hydrometallurgy, Vol.72 No.1-2, 2004

B. D. Pandey, V. Kumar, D. Bagchi, R. K. Jana and Premchand. Processing of Tungsten Preconcentrate from Low Grade Ore to Recover Metallic Values. Mineral Processing and Extractive Metallurgy Review, Vol.22 No.4-6, 2000

J.P. Srivastava, P.N. Pathak. Pre-concentration: a necessary step for upgrading tungsten ore. Int. J. Mineral Processing, Vol.60, No.1, 2000