Technical and economical study of applicability of a centrifugal force gravity separator (MGS) to kef chromite concentration plant

Cicek T., Coecen I., Engin V. T., Sen S., Cengizler H.

20th International Mining Congress and Exhibition of Turkey (IMCET 2007), Ankara, Turkey, 6 - 08 June 2007, pp.81-90 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.81-90
  • Dokuz Eylül University Affiliated: No


In this paper, the results of MGS upgrading tests on chromite gravity tailings of Kef concentrator are presented. Initial sample for the tests was about - I mm in size and showed a Cr2O3 content of 24.72%. Metal/screen analysis proved that about 23.32% of chromite was present in the size fraction of -106 microns. A series of tests were performed with MGS using -100 and 1001150 microns fraction of the initial sample. Under optimum operation conditions, a concentrate with 43.7% Cr2O3 content and 65% chromite yield for the size fraction of -100 microns and a concentrate with 30.4% Cr2O3 and 87% chromite yield for the size fraction of 1001150 microns, could be produced. Shaking table test results revealed that the coarse fraction of the tailings can not be enriched further due to high concentration of the interlocked particles. However, when the coarse tailings are ground below 100 microns, a saleable concentrate could be obtained by using MGS (140 rpm and 150 rpm rotational speeds were used and the concentrates containing 48.47% Cr2O3 ve 42.80 % Cr2O3 were obtained with 44.05 % and 57.01 % recoveries). The results of this study suggest that multi gravity separation of the Kef tailings is technically possible and economically viable. The pay-back time of the 2 alternatives for use of MGS in Kef concentrator has been calculated as less than 7 months.