Leaching behaviour of zinc from a smithsonite ore in sodium hydroxide solutions

• Autorzy: Ehsani Ilhan , Ucyildiz Ayse , Obut Abdullah

Identyfikatory

DOI

10.5277/ppmp18150

• Języki publikacji: EN

Abstrakty

EN

In this study, the leaching behaviour of zinc from a smithsonite ore sample (23.43% Zn) having goethite and calcite as main gangue minerals was investigated in sodium hydroxide solutions using Xray diffraction and chemical analyses. Within the studied NaOH concentration range (1-4 mole/dm3), higher leaching ratio values for Zn were obtained by leaching at 298 K because of the decreased stability of soluble zincate species in solution at higher temperatures. When the concentration of NaOH solution was increased from 1 to 3 mole/dm3 at 298 K, leaching ratio value of Zn increased from 3.8 to 70.1%. At 4 mole/dm3 NaOH concentration, Zn leaching ratio value (70.9%) levelled off due to the formation of solid hydrated calcium zincate phase in leaching solution. On the other hand, very low leaching ratio values of Zn were obtained by leaching in 1 mole/dm3 NaOH solution at 298 K (3.8%) and 363 K (1.4%) due to the formation of solid zinc hydroxide and solid zinc oxide phases, respectively. It was observed that increasing leaching time from 1800 to 14400 s at 3 mole/dm3 NaOH concentration, favoured the formation of hydrated calcium zincate phase and so decreased the leaching ratio of Zn to a lower value (60.6%). The effect of solid/liquid ratio was also investigated and it was found that when solid/liquid ratio was decreased, Zn leaching ratio values decreased at constant OH/Zn mole ratio and increased at constant NaOH concentration conditions. Besides, for some of the experiments, leaching ratio values of lead were also given.

Słowa kluczowe

EN

alkaline leaching; calcium zincate; nonsulfide zinc ore; smithsonite; zinc carbonate

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 2
• Strony: 407--416
• Opis fizyczny: Bibliogr. 58 poz., rys., tab.

Twórcy

autor

Ehsani Ilhan

• Hacettepe University, Mining Engineering Department, 06800 Beytepe, Ankara, Turkey
• [e-mail]

autor

Ucyildiz Ayse

• Hacettepe University, Mining Engineering Department, 06800 Beytepe, Ankara, Turkey

autor

Obut Abdullah

• Hacettepe University, Mining Engineering Department, 06800 Beytepe, Ankara, Turkey

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).