Recovery of metal values from copper slags by flotation and roasting with pyrite


Minerals Processing, vol.24, no.1, pp.13-18, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1007/bf03403353
  • Journal Name: Minerals Processing
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.13-18
  • Keywords: copper slag, cobalt, flotation, roasting, CONVERTER SLAG, COBALT
  • Istanbul Technical University Affiliated: Yes


The recovery of copper and cobalt from ancient copper slags from the Kure region of Turkey was investigated. A fayalitic-type of ancient copper slag containing 1.24% Cu, 0.53% Co and 53.16% Fe were subjected to (in experimental study. Two different routes were followed to recover the metal values. The first route was roasting the slag with pyrite followed by leaching. The second route was flotation of the slags, roasting of the flotation tailings with pyrite and leaching. The second route was found to be suitable for the treatment of the copper slag studied. In the flotation step, a copper concentrate containing approximately 11% Cu was produced with a 77% recovery while 93% of the cobalt stayed in the tailings. In the roasting experiments, the effects of roasting time, pyrite:slag ratio and roasting temperature on the dissolution efficiencies of Cu and Co were investigated, and the optimum conditions were determined. In the tests, 87% of the cobalt dissolution was observed after one hour of roasting at 500 degrees C with a pyrite:slag ratio of 3:1. The copper dissolution in the tests was 31%. Based on the results of this study, a process flow sheet is proposed for the evaluation of these slags.