UDC (549.5.517.2 + 549.521.51 + 549.731.13)

T.S. Antonenko,
A.B. Brik,
N.O. Dudchenko.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine. 34, Acad. Palladin Ave., Kyiv, Ukraine, 03142


Language: Ukrainian
Mineralogical journal 2019, 41 (1): 49-59

Abstract: The phenomenon of sorption of Fe (II) ions was investigated in the process of transformation of goethite ore of the Kerch iron ore basin and samples of goethite and hematite ores of the Kryvyi Rih iron ore basin. Spectrophotometry was used to study experimentally the phenomenon of Fe (II) ions sorption on the surface. An aqueous Fe2+-containing solution and alkali were added to the initial crushed raw material, followed by heating at a temperature of 98 °C for 30 minutes. The determination of the Fe (II) ions concentration was carried out with the addition of each material. The highest sorption ability was found in a sample of hematite concentrate of Kryvyi Rih. The phase composition of the initial and transformed samples was determined by X-ray diffraction analysis. The magnetic characteristics before and after transformation were investigated by magnetometry. After transformation, the saturation magnetization increased. Saturation magnetization for all initial samples was < 1 А∙m2/kg, that of transformed samples was within 5-14 A·m2/kg. The behavior of iron ores with changing pH of the medium was also investigated. In the Fe2+-containing solution and Fe3+-containing solution it is significantly different: in the Fe2+-containing solution rapid increase in pH begins with the addition of 2 ml of ammonium hydroxide, and in Fe3+-containing solution, after adding 16 ml of ammonium hydroxide. Possible mechanisms of transformation of goethite and hematite to magnetite in an aqueous medium are described: Magnetite is formed by the addition of Fe2+ to weakly magnetic phase. The electron exchange between Fe2+ and Fe3+ occurs. Fe2+ ions adsorb at the surface and release electrons into the crystal. The electrons migrate to edge sites, where they convert Fe3+ ions of the bulk crystal surface into Fe2+. The results could be used to solve the fundamental problems associated with the mechanisms of transformation of iron oxides and hydroxides in an aqueous medium.
Keywords: goethite, hematite, iron ores, phase transformations, magnetite, sorption, magnetometry, pH medium.


  1. Bolshanіna, S.B., Іvchenko, V.D. and Ableyeva, І.Yu. (2014), Vіsnik Vіnnitskogo polіtekhn. іn-tu, No. 2, Vіnnitsa, UA, pp. 21-24.
  2. Marchenko, Z. (1971), Fotometrycheskoe opredelenye еlementov, Per. s pol. Matveeva, I.V. and Nemodruk, A.A., in Zolotov, Yu.A. (ed.), Mir press, Moscow, RU, 502 p.
  3. Ponomarenko, O.M., Brik, A.B., Dudchenko, N.O., Yanyshpol's'kyy, V.V. and Alyekseytsev, Yu.O. (2014), M.P. Semenenko IGMOF of NASU, Prystriy dlya ekspresnoho vymiryuvannya namahnichenosti rud ta mahnitnykh materialiv, State Register of Patents of Ukraine, Kyiv, Pat. UA 94163U, Opubl. 27.10.2014, Byul. No. 20.
  4. Ponomarenko, O.M., Brik, A.B., Dudchenko, N.O., Yanyshpol's'kyy, V.V. and Yushyn, O.O. (2013), M.P. Semenenko IGMOF of NASU, Sposib nyz'koenerhetychnoho omahnichuvannya slabomahnitnykh, okyslenykh zaliznykh rud dlya mahnitnoyi separatsiyi, State Register of Patents of Ukraine, Kyiv, Pat. UA 82529U, Opubl. 12.08.2013, Byul. No. 15.
  5. Frog, B.N. and Levchenko, A.P. (1996), Vodopodgotovka, Uchebnoe posobie dlya VUZov, Izd-vo Moscow Gos. Univ., RU, 680 p.
  6. Deb, P.Jaisi, Chongxuan, Liu, Hailiang Dong, Ruth, E.Blake and Jeremy, B.Fein. (2008), Geochim. et cosmochim. acta, Vol. 72, pp. 5361-5371.
  7. Usman, M., Abdelmoula, M., Faure, P., Ruby, C. and Hanna, K. (2013), Geoderma, Vol. 197-198, pр. 9-16.
  8. Taebin Ahn, Jong Hun Kim, Hee-Man Yang, Jeong Woo Lee and Jong-Duk Kim. (2012), J. Phys. Chem. C., Vol. 116, рp. 6069-6075.
  9. Yutaka Tamaura, Kazuo Ito and Takashi Katsura (1983), J. Chem. Soc., Dalton Trans., Iss. 2, pp. 189-194.