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- 저자 : Harshit Mahandra (검색결과 2 건)
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Harshit Mahandra,Rashmi Singh,Bina Gupta 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
This study investigates the partition of molybdenum in presence of hydrochloric acid with Cyphos IL 104 diluted in toluene and recovery of molybdenum from spent hydrodesulphurization catalyst. Effect of various parameters has been estimated. Recyclability and loading capacity have been assessed. Influence of temperature confirmed the process to be endothermic in nature. Binary separations of molybdenum have been achieved with high separation factors. Optimized conditions have been fused for molybdenum recovery from spent hydrodesulphurization catalyst leach liquor. McCabe–Thiele diagrams have been constructed. Molybdenum is finally obtained as MoO3 from the strip solution and characterized by XRD, FE-SEM and EDX techniques.
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A sustainable approach for gold recovery from refractory source using novel BIOX-TC system
Atefeh Azizitorghabeh,Harshit Mahandra,Juliana Ramsay,Ahmad Ghahreman 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
This study developed a sustainable method for gold extraction from low-grade refractory ore by combiningacidic biooxidation and thiocyanate (SCN) leaching (BIOX-TC) in one system to avoid neutralizationand minimize the complexity of the process. Among leachant candidates, thiocyanate was proposed asa less toxic reagent for gold leaching. Furthermore, thiocyanate requires ferric iron as an oxidant for goldextraction and ferric iron can be provided by the microorganisms during biooxidation. In the first step,acidic biooxidation was done using a mixture of acidophiles including Acidithiobacillus ferrooxidans,Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans resulting in 59.6% sulfur oxidation. A preliminarystatic incubation of Acidithiobacillus thiooxidans also improved biooxidation efficiency achievinghigher sulfur oxidation of 87.8%. Following biooxidation, thiocyanate leaching using 0.2 M SCN wasperformed under three different conditions: (1) in a separate flask with 0.01 M ferric iron addition; (2)in-situ leaching, in the biooxidation flask with the mixed bacterial culture); (3) in-situ leaching in thebiooxidation flask with the bacterial culture and with 0.01 M additional ferric iron. It was found thatin-situ thiocyanate leaching of the biooxidized ore in the presence of the bacterial culture and withoutferric iron addition resulted in the highest gold recovery (86.9%). The biooxidation mechanism and itskinetics have been extensively discussed in this paper.
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