Enhanced leaching of copper from chalcopyrite in hydrogen peroxide–glycol system

Mahajan, Vinay; Misra, M.; Kang-nian, Zhong; Fuerstenau, M. C.

doi:10.1016/j.mineng.2006.12.016

Cited by 102 publications

(47 citation statements)

References 11 publications

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“…The variation of the extent of leaching as a function of time at 65˝C as compared to 75˝C is insignificant, relative to lower temperatures. This is consistent with the observation by Mahajan, et al [51] who found that no improvement in Cu leach rates occurred between 65 and 75˝C. Compared to the Cu leaching rates at 65 and 75˝C, the initial Cu extraction percentage within the first 25 h at 50˝C was distinctly reduced; however, it increased rapidly in the subsequent leach period, reaching around 85% Cu extraction at 180 h. A similar trend was observed for leaching at 43˝C for which a longer "induction" period was observed.…”

Section: Effect Of Temperature and Ph (No Iron Addition)supporting

confidence: 94%

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Wei

Qian

et al. 2016

Minerals

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Abstract:To better understand chalcopyrite leach mechanisms and kinetics, for improved Cu extraction during hydrometallurgical processing, chalcopyrite leaching has been conducted at solution redox potential 750 mV, 35-75˝C, and pH 1.0 with and without aqueous iron addition, and pH 1.5 and 2.0 without aqueous iron addition. The activation energy (E a ) values derived indicate chalcopyrite dissolution is initially surface chemical reaction controlled, which is associated with the activities of Fe 3+ and H + with reaction orders of 0.12 and´0.28, respectively. A surface diffusion controlled mechanism is proposed for the later leaching stage with correspondingly low E a values. Surface analyses indicate surface products (predominantly S n 2´a nd S 0 ) did not inhibit chalcopyrite dissolution, consistent with the increased surface area normalised leach rate during the later stage. The addition of aqueous iron plays an important role in accelerating Cu leaching rates, especially at lower temperature, primarily by reducing the length of time of the initial surface chemical reaction controlled stage.

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Section: Effect Of Temperature and Ph (No Iron Addition)supporting

confidence: 94%

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Wei

Qian

et al. 2016

Minerals

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“…This enhancing effect of ethylene glycol ( Figures 5-6) can be attributed to the formation glycol-copper complexes, reducing the reactivity of copper towards H2O2. In accordance with the current findings ( Figures 5-6), previous reports [14,26] confirmed that ethylene glycol could significantly improve the stability of H2O2 in some applications. Mahajan and Misra [26] studied peroxide assisted sulphuric acid leaching (H2SO4+H2O2) of copper from chalcopyrite mineral.…”

Section: Discussionsupporting

confidence: 93%

“…In accordance with the current findings ( Figures 5-6), previous reports [14,26] confirmed that ethylene glycol could significantly improve the stability of H2O2 in some applications. Mahajan and Misra [26] studied peroxide assisted sulphuric acid leaching (H2SO4+H2O2) of copper from chalcopyrite mineral. The researchers tested the effect of ethylene glycol (1-8 mL/L) on consumption of H2O2 over a period of 4 h. They found that, in the absence of glycol, almost complete decomposition of H2O2 was observed while addition of glycol substantially improved H2O2 stability i.e.…”

Section: Discussionsupporting

confidence: 93%

“…However, almost all the earlier studies appear to focus mainly on extending the shell life of concentrated acidic (stock) solutions of hydrogen peroxide (25-90% w/w H2O2). To the author's knowledge, only a few studies [14,26] have been reported on practical use of additives on improvement of stability of hydrogen peroxide. Bas et al [14] investigated the effect of ethylene glycol on recovery of silver from X-ray film effluents with H2O2.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of Stability of Hydrogen Peroxide using Ethylene Glycol

Yazıcı¹

2017

deufmd

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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. Hidrojen Peroksitin Kararlılığının Etilen Glikol Kullanılarak İyileştirilmesi ve Ergun Testi ile Verilerin İstatistiksel Değerlendirmesi Anahtar KelimelerHidrojen peroksit, Etilen glikol, Sitrik asit, Kararlılık, Bakır, Ergun testi Özet: 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 H2O2, 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 H2O2 kararlılığına bir etkisi gözlenmemesine karşın bakır varlığında %33'e varan iyileştirme sağlanmıştır. Sitrik asit ilavesi bakır varlığında H2O2 kararlığını olumsuz etkilemiştir.

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“…As known, temperature increases reaction rate and equilibrium constant. However, rapid decomposition of hydr ogen peroxide occurs at higher temperatures (Antonijevic et al, 1997;Mahajan et al, 2007). Figure 5 shows the effect of acid concentration on the S/N ratio for extraction of nickel from lateritic ore in hydrochloric acid solution with hydrogen peroxide.…”

Section: Temperaturementioning

confidence: 99%

Optimization of Nickel Extraction From Lateritic Ore in Hydrochloric Acid Solution With Hydrogen Peroxide by Taguchi Method

Aras¹,

Agacayak²

2017

Scitech

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Taguchi optimization method was used to determine optimum conditions for the extraction of nickel from lateritic ore in hydrochloric acid solution with hydrogen peroxide. Leaching time, stirring speed, temperature, hydrochloric acid concentration and hydrogen peroxide concentration were chosen as parameters. The optimum conditions for dissolution w ere found as leaching time of 240 min, a temperature of 70°C, hydrochloric acid concentration of 3 M, hydrogen peroxide concentration of 0.1 M and without stirring. The experimental results under optimum leaching conditions, showed that the extraction of nickel from lateritic ore was 90.66%. Analysis of variance (ANOVA) was applied to experimental results. Percentage contributions of each factor for the extraction of nickel were determined. Key Words: Leaching, Lateritic ore, Nickel; Hydrochloric acid, Hydrogen peroxide; Taguchi method Nikelin Lateritik Cevherden Hidrojen Peroksitli Hidroklorik Asit Çözeltisinde ÇözündürülmesininTaguchi Yöntemiyle Optimizasyonu ÖZ: Nikelin lateritik cevherden hidrojen peroksitli hidroklorik asit çözeltisinde çözündürülmesinin optimum koşullarını belirlemek için Taguchi optimizasyon yöntemi kullanılmıştır. Deney parametreleri olarak, süre, karıştırma hızı, sıcaklık, hidroklorik asit derişimi ve hidrojen peroksit derişimi seçilmiştir. Çözündürme için optimum koşullar, karıştırma yapılmadan, 240 dakika liç süresi, 70 °C sıcaklık, 3 M hidroklorik asit derişimi ve 0.1 M hidrojen peroksit derişimi olarak bulunmuştur. Optimum koşullarda yapılan deney sonuçları, nikelin lateritik cevherden çözündürülmesinin %90.66 olduğunu göstermiştir. Deney sonuçlarına varyans analizi (ANOVA) uygulanmış ve her faktörün nikel çözündürülmesine olan katkısı belirlenmiştir.

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Enhanced leaching of copper from chalcopyrite in hydrogen peroxide–glycol system

Cited by 102 publications

References 11 publications

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Improvement of Stability of Hydrogen Peroxide using Ethylene Glycol

Optimization of Nickel Extraction From Lateritic Ore in Hydrochloric Acid Solution With Hydrogen Peroxide by Taguchi Method

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