SEPARATION OF NICKEL AND IRON FROM LATERITIC ORE USING A DIGESTION - ROASTING - LEACHING - PRECIPITATION PROCESS


Basturkcu H., Acarkan N.

PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING, vol.52, no.2, pp.564-574, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52 Issue: 2
  • Publication Date: 2016
  • Doi Number: 10.5277/ppmp160204
  • Title of Journal : PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
  • Page Numbers: pp.564-574

Abstract

This paper investigates extraction of nickel and iron from a lateritic nickel ore from the Caldag region of Manisa in Turkey. The ore sample contains 1.2% Ni, 24.77% Fe and 0.062% Co. The process applied includes digestion with 40 wt-% sulfuric acid at 200 degrees C for 60 min, roasting at 700 degrees C for 15 min, leaching with water for 30 min at 1: 5 solid/liquid ratio (by weight) and precipitation of the remaining iron at pH 3 and 60 degrees C. In order to improve nickel and cobalt extractions using the digestion-roasting-leaching-precipitation process (DRLP), Na2SO4 addition in the roasting stage was examined. Under the optimum conditions and in the presence of Na2SO4, 86.2% Ni and 94.2% Co extractions were obtained with almost zero iron content. As a result, 2.07 g dm(-3) Ni, 0.12 g dm(-3) Co and 0.05 g dm(-3) Fe could be achieved in the pregnant leach solution within nearly 2.5 hours.