Magnesium recovery from magnesite tailings by acid leaching and production of magnesium chloride hexahydrate from leaching solution by evaporation

ÖZDEMİR M., Cakir D., KIPÇAK İ.

INTERNATIONAL JOURNAL OF MINERAL PROCESSING, vol.93, no.2, pp.209-212, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 93 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1016/j.minpro.2009.08.001
  • Journal Name: INTERNATIONAL JOURNAL OF MINERAL PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.209-212
  • Keywords: Magnesite tailings, Hydrochloric acid, Magnesium leaching, Magnesium chloride hexahydrate, DISSOLUTION KINETICS, NATURAL MAGNESITE
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

The recovery of magnesium from magnesite tailings in aqueous hydrochloric acid solutions by acid leaching was studied in a batch reactor using hydrochloric acid solutions. Subsequent, production of magnesium chloride hexahydrate (MgCl(2 center dot)6H(2)O) from leaching solution was also investigated. The effects of temperature, acid concentration, solid-to-liquid ratio, particle size and stirring speed on the leaching process were investigated. The pseudo-second-order reaction model seemed to be appropriate for the magnesium leaching. The activation energy of the leaching process was estimated to be 62.4 kJ mol(-1). Finally, MgCl(2 center dot)6H(2)O in a purity of 91% was produced by evaporation of leaching solution obtained at a temperature of 40 degrees C, 1.0 M acid, solid-to-liquid ratio of 10 g/L, particle size of 100 mu m, stirring speed of 1250 rpm and leaching time of 60 min. (C) 2009 Elsevier B.V. All rights reserved.