ALTIN CEVHERİ FLOTASYONUNDA BİR PİRİT BASTIRICI OLARAK SODYUM DİTİYONİT

Year 2024, , 1152 - 1158, 22.04.2024

Semih Oluklulu , Volkan Bozkurt , Yaşar Uçbaş

https://doi.org/10.31796/ogummf.1345792

Abstract

Sodyum ditiyonit (Na2S2O4) sülfürlü cevherlerin flotasyonunda pülp potansiyelini (Eh) düşürmek ve pirit bastırmak için yaygın olarak kullanılan bir indirgeyicidir. Bu çalışmada sodium ditiyonitin altın cevheri flotasyonunda pirit bastırıcı etkisi pH 8 ve 10,5’ta altın, kalkopirit ve pirit verim ve tenörleri açısından karşılaştırılmalı olarak incelenmiştir. Sodyum ditiyonitin varlığı, etkisi incelenen pH değerlerinden bağımsız olarak Eh değerlerinde, 50-70 mV bir düşüşe neden olmuştur. Bu da sodyum ditionitin indirgeyici etkisine işaret etmektedir. Sodyum ditiyonitin altın ve kalkopiritin verim ve tenörleri üzerindeki etkisi özellikle pH 10,5’ta oldukça sınırlıdır. Buna karşın, sodyum ditiyonit pH 8’de altın ve kalkopirit verim ve tenörlerini az miktarda düşürürken, pirit verim ve tenörü üzerinde dikkat çekiçi bir düşüş sağlamıştır. Sodyum ditiyonitin pH 8’deki kullanımı sonucunda pirit verimi %79,5’ten %54,7’ye düşerken, pirit tenörü %15,3’ten %10,7’ye gerilemiştir. Sonuç olarak, sodyum ditiyonit kullanımı ile altın ve kalkopiritin, pirit seçimli olarak yüzdürülmesinin daha düşük pH değerinde, Eh değerinin bir miktar azaltılarak elde edilebileceği düşünülmektedir.

Keywords

Flotasyon, Altın, Kalkopirit, Pirit, Sodyum Ditiyonit

SODIUM DITHIONITE AS A PYRITE DEPRESSANT IN GOLD ORE FLOTATION

Abstract

Sodium dithionite (Na2S2O4) is a widely used reducing agent to control pulp potential (Eh) and pyrite depressant in sulfide ore flotation. In this study, the pyrite depressant effect of sodium dithionite on gold ore flotation was investigated at pH 8 and pH 10.5 comparatively in terms of gold, chalcopyrite, and pyrite recoveries and grades. The presence of sodium dithionite resulted in a drop of approximately 50–70 mV in the Eh values, regardless of the studied pH values, confirming the reducing effect of sodium dithionite. The effects of sodium dithionite on gold and chalcopyrite grades and recoveries were quite limited, especially at pH 10.5. At pH 8, the utilization of sodium dithionite slightly decreased gold and chalcopyrite recovery and grades, while the decrease in pyrite recovery and grades was remarkable. Both pyrite recovery and grade were reduced from 79.5% to 54.7% and 15.3% to 10.7% by the utilization of sodium dithionite at pH 8. In conclusion, it is considered that the selective flotation of gold and chalcopyrite from pyrite can be achieved at a lower pH accompanied by a slightly reduced Eh by the utilization of sodium dithionite.

Keywords

Flotation, Gold, Chalcopyrite, Pyrite, Sodyum dithionite

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