Browsing by Subject "Metal screens"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Technical and economical applicability study of centrifugal force gravity separator (MGS) to Kef chromite concentration plant
    (2008) Çiçek T.; Cöcen I.; Engin V.T.; Cengizler H.; Şen S.
    The results of multigravity separator (MGS) upgrading tests on fine chromite gravity tailings using - 100 and -100 + 150 μm fractions of the initial sample (-1 mm) with 24-7%Cr2O3 grade were presented. The metal screen analysis revealed that 20·66% of the total Cr2O3 content was present in the -106 μm size fraction. Under optimal operational conditions, a concentrate with 43·7%Cr 2O3 content and 65·0% chromite yield for the size fraction of -100 μm and a concentrate with 30·5%Cr2O 3 and 83·3% yield for the size fraction of -100 + 150 μm could be produced. Shaking table test results revealed that the coarse fraction of the tailings could not be enriched any further owing to the high concentration of interlocked particles. However, a saleable concentrate could be obtained by MGS when the coarse tailings were ground down to - 100 μm and used as the feed. The results of the study suggested that multigravity separation of the Kef tailings was technically feasible and economically viable. The payback time of two alternatives suggested for the utilisation of MGS in Kef concentrator was calculated to be <7 months. © 2008 Institute of Materials, Minerals and Mining and The AusIMM.
  • No Thumbnail Available
    Item
    Enrichment of a low grade chromite ore
    (Grup Matbaacilik, 2009) Çiçek T.; Cöcen I.; Cengizler H.
    The applicability of Mozley centrifugal force gravity separator (MGS) to fine fractions (-0.1 mm) of a low grade chromite ore (9.3 % Cr2O3) was investigated. The metal-screen analysis revealed that 83.9 % of the material ground under 1 mm for tests was in the +0.106 mm fraction containing 8 % Cr2O3. On the other hand, 16.1 % was in the-0.106 mm size fraction containing 16.12 % Cr2O3. The +0.1 and -0.1 mm fractions were used as feed for shaking table and MGS tests respectively. A saleable shaking table concentrate with low chromite recovery was obtained by shaking table tests. However, after some of the shaking table products were ground under-100 μm and concentrated with MGS, a chromite concentrate with 46.22 % Cr2O3 grade and 66.1 % Cr2O3 wt. recovery was obtained by the combination of shaking table and MGS. It was seen that MGS was an applicable beneficiation method at fine fractions for concentration of a low grade chromite ore. A principal flowsheet for the concentration plant was proposed.
  • No Thumbnail Available
    Item
    An efficient process for the beneficiation of a low grade chromite ore
    (2010) Çiçek T.; Cengizler H.; Cöcen I.
    The applicability of centrifugal force multigravity separator (MGS) to concentrate fine fractions (-0.1 mm) of a low grade chromite ore assaying 9.3%Cr2O3 was investigated. The metal screen analysis revealed that 83.92% of the material prepared for tests was in the +0.106 mm fraction containing 8%Cr2O3 and that 16.08% was in the -0.106 mm size fraction containing 16.12%Cr2O3. The +0.1 and -0.1 mm fractions of the ore was used as feed for shaking table and MGS tests respectively. The results gathered from shaking table test were not satisfactory due to low Cr2O3 recoveries. However, a chromite concentrate with 46.22%Cr2O3 grade and 66.1 wt-%Cr2O3 recovery was obtained by the combination of shaking table and MGS. It was clearly demonstrated that MGS is an ideal beneficiation equipment for fine fractions of a low grade Cr2O 3 ore. Based on the experimental results, a principal flowsheet for the enrichment plant was proposed. © 2010 Maney Publishing.