Antimony Extraction from Stibnite Ore Using Alkaline Hydrometallurgical Method

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Zekavt, MirMehdi | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52126 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yoozbashizadeh, Hossein
Abstract:
In this research, antimony extraction by hydrometallurgical method has been investigated using an alkaline medium. Stibnite ore, as a source of antimony was leached in alkali potassium hydroxide solution. Furthermore, related kinetic equations and process factors were also studied. It was determined that optimum conditions occure when the concentration of KOH is 0.5 mol /L, the solid to liquid ratio is 100 g/L, the reaction temperature is 25 °C, and the process is performed in 115 minutes. It was found that diffusion through the ash layer controls the reaction kinetics during the first 60 minutes. Finally, for the first time, the effect of different parameters on antimony electrowinning was investigated and the final product was evaluated quantitatively and qualitatively. Sodium pyroantimonate sedimentation, which used as a flame retardant, was performed by the direct oxidation of leaching solution
Keywords:
Antimony ; Hydrometallurgy ; Leaching ; Electrowining ; Sedimentation ; Sodium Pyroantimonate

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