Developing an optimum beneficiation route for a low-grade chromite ore


CAN İ. B. , Ozsoy B., ERGÜN Ş.

PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING, cilt.55, ss.865-878, 2019 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 55 Konu: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.5277/ppmp19006
  • Dergi Adı: PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
  • Sayfa Sayıları: ss.865-878

Özet

In this study, an optimum beneficiation route was developed for an existing concentrator that processes low-grade chromite deposits. This objective is challenging as the grade of the ore under consideration is approximately 5%, which is the lowest grade processed in Turkey. Detailed characterization, process mineralogy and liberation studies were performed. The optimum fineness of grind was found to be 100% finer than 0.4 mm after the initial beneficiation tests. Laboratory test work was performed using a combination of a teetered bed separator (TBS), spiral concentrator and shaking table. Two different circuit alternatives including a TBS followed by only shaking tables and a combination of a spiral concentrator, TBS, and shaking tables were compared. It was found that an alternative comprising a spiral concentrator, TBS, and shaking table provided better results, required less equipment, etc. Considering these results, a provisional flowsheet was developed, and a total final concentrate of 6.8% by weight with 49.5% Cr2O3 grade and 71.51% Cr2O3 recovery could be obtained. The detailed laboratory test work was followed by plant-scale trials for the verification of the experimental findings with different circuit configurations. From roughing and scavenging spiral groups, similar to 85% of chromite could be obtained prior to the shaking table concentration, and this led to a minimum increase of 20% in the total recovery with less footprint of the plant, reduced water usage, and lower operating costs.