IMPROVEMENT OF STABILITY OF HYDROGEN PEROXIDE USING ETHYLENE GLYCOL

Öz

Owing to its high oxidising power and environmentally friendly nature, hydrogen peroxide (H2O2) is commonly used in environmental and hydrometallurgical applications such as treatment of cyanidation effluents and leaching of metals from ores/concentrates/waste materials. However, H2O2 rapidly undergoes catalytic decomposition particularly in the presence of metal ions such as copper. The aim of this study is to investigate the influence of certain additives on the improvement of stability of H2O2.The influence of addition of ethylene glycol (2.5-20 mL/L) and citric acid (4.8-80 mM) on the stability of H2O2 in the absence/presence of copper was tested. The time-dependent data were statistically analysed using Ergun’s test. No effect of ethylene glycol was observed on the stability of H2O2 in the absence of Cu while a substantial improvement (up to 33%) was noted in its presence. The addition of citric acid in the presence of copper negatively influenced the stability of H2O2

Anahtar Kelimeler

• Hydrogen peroxide, Ethylene glycol, Citric acid, Stability, Copper, Ergun’s test

HİDROJEN PEROKSİTİN KARARLILIĞININ ETİLEN GLİKOL KULLANILARAK İYİLEŞTİRİLMESİ VE ERGUN TESTİ İLE VERİLERİN İSTATİSTİKSEL DEĞERLENDİRMESİ

Öz

Yüksek oksitleyici özelliği ve çevre dostu bir reaktif olması nedeniyle, hidrojen peroksit (H2O2) siyanürlü atık çözeltilerin rehabilitasyonu ve metallerin cevher/konsantre/atıklardan liçi gibi çevresel ve hidrometalurjik uygulamalarda yaygın olarak kullanılmaktadır. Ancak H2O, özellikle bakır gibi metal iyonlarının varlığında katalitik bozunmaya uğramaktadır. Bu çalışmanın amacı, belirli katkı maddelerinin H2O2 kararlığına etkisinin araştırılmasıdır. Etilen glikol (2,5-20 mL/L) ve sitrik asit (4,8-80 mM) ilavesinin H2O2 kararlılığına etkisi bakır yokluğunda/ varlığında test edilmiştir. Zamana bağlı verilerin istatistiksel analizinde Ergun testi kullanılmıştır. Bakır yokluğunda etilen glikolün H2O kararlılığına bir etkisi gözlenmemesine karşın bakır varlığında %33’e varan iyileştirme sağlanmıştır. Sitrik asit ilavesi bakır varlığında H2O2 kararlığını olumsuz etkilemiştir

Anahtar Kelimeler

• Hidrojen peroksit, Etilen glikol, Sitrik asit, Kararlılık, Bakır, Ergun testi

Kaynakça

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