Investigation of Alkaline Leaching Parameters on Stibnite Concentrate

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Aktaş S. , Çetiner B. N.

MINING METALLURGY & EXPLORATION, cilt.37, ss.1729-1739, 2020 (SCI Expanded İndekslerine Giren Dergi)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 37
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s42461-020-00266-x
  • Sayfa Sayıları: ss.1729-1739


According to critical statistical studies, antimony is one of the rarest elements in the world, and global resources could be

exhausted by 2050. In light of these observations, its extraction will be costly due to poor-quality ore, deep mining, remote

locations, and high energy consumption. In the present study, an alkaline leaching process was carried out on stibnite concentrate

to evaluate the effect of reaction parameters on the percentage of antimony extraction. The leaching efficiencies of different sulfur

and hydroxide sources were studied and compared to one another to create a better understanding of the reaction process. Kinetic

models were investigated to identify the reaction pathway and calculate the activation energy. The activation energy of the

stibnite dissolution was assessed as 19.13 kJ/mol using a two-dimensional diffusion-reaction model. The value of activation

energy indicates the quantity of energy necessary for a reaction to proceed. As expected, potassium hydroxide leaching was

significantly more successful than was sodium hydroxide; however, in terms of economics, the use of sodium hydroxide was

found to be more cost-efficient. Interestingly, this finding indicated that caustic leaching is still the most effective method for

stibnite extraction.