Thermal dehydration and decomposition of FeCl3·xH2O
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Thermal dehydration and decomposition characteristics of Fe(III) chloride hydrate have been studied by both isothermal and non-isothermal methods. After the initial melting at 35–40°C both dehydration and decomposition of the salt proceed simultaneously at temperature above 100°C. At 250–300°C a stable hydrated Fe(OH)2Cl is formed representing the first plateau region in the TG curve. Around 400°C, a second plateau is observed corresponding to the formation of mostly Fe2O3 which however retains some OH groups and Cl− ions. However, these temperature ranges vary with the TA equipments used. Chemical analysis of the products of decomposition at temperatures above 140°C also gives evidence for the formation of FeOCl which on hydrolysis in water gives FeCl3 in solution. The FT-IR spectra suggest the presence of structural OH groups even for samples calcined at 300–400°C. The XRD patterns of the products of decomposition in the temperature range 160–400°C indicate the presence of β-FeOOH, some unidentified basic chlorides and α-Fe2O3.
Keywordsdecomposition dehydration Fe(III) chloride hydrate
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- 1.M.L. Skow, R. C. Kirby and J. E. Conley, Rept. Invest. U. S. Bur. Mines, No. 5171, p. 29.Google Scholar
- 2.U. Scheffer and K. H. Ulrich, Ger. Offen. 2, 249, 302 (to Friedrich Krupp, G.m.b.H).Google Scholar
- 3.K. N. Han and D. W. Fuerstenau, Miner. Processing Technol Rev., 1 (1983) 1.Google Scholar
- 4.P. B. Queneau and H. J. Roorda. Min. Eng., 23 (1971) 70.Google Scholar
- 5.H. Jedlicka, Proc. Symp. on chloride hydrometallurgy, Brussels 1977, p. 182.Google Scholar
- 6.H. N. Sinha and J. R. Tufley, Extractive metallurgy '81, The Inst. Mining Metallurgy, London 1981, p. 421.Google Scholar
- 7.A. Van Peteghem, U. S. Pat 4, 026, 773, May 3, 1977 (to Metallurgie Hoboken Oberpelt).Google Scholar
- 8.J. W. Mellor, Comprehensive Treatise on Inorganic and Theoretical Chemistry, Vol. 14, Longmans, London 1965, pp. 72–73.Google Scholar
- 9.A. W. Henderson, T. T. Campbell and F. E. Block, Metal. Trans., 3 (1972) 2579.Google Scholar
- 10.J. Ellis, R. Giovanoli, W. Sturm, Chimia, 30 (1976) 141.Google Scholar
- 11.T. Ishikawa and K. Inouye, Bull. Chem. Soc., (Japan) 48 (1975) 1580.Google Scholar