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Lala Bihari Sukla,Mousumi Mishra,Sradhanjali Singh,Trupti Das,Rabi Narayana Kar,Karanam Srinivasa Rao,Barada Kanta Mishra 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
Bioleaching involves the use of iron and sulfur oxidizing microorganisms to catalyze the dissolution of valuable metals. In this investigation, lagoon material contains 0.39% Cu, in which the major copper bearing mineral is chalcopyrite associated with other minerals present as minor phase. Leaching experiments were carried out using an adapted strain of Acidithiobacillus ferrooxidans with various parameters such as presence/absence of iron, pH, pulp density and temperature. Base of the medium was 9 K (without ferrous) Bio-dissolution of copper was found to be maximum, i.e., 80.9% with 9 K+ (with ferrous) at pH-2.0, 10% pulp-density and 35 oC within an incubation period of 30 days.
Chandra Sekhar Gahan,Haragobinda Srichandan,김동진,Sradhanjali Singh,Seoung-Won Lee 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.5
Microbial leaching of a petroleum spent catalyst was carried out using mixed mesophilic iron and sulfur oxidizing acidophiles. Bench-scale batch stirred tank reactors with a working volume of 1 L were used in this study at 35 oC. The pulp density considered for the study was 10% (w/v), while the particle size of the spent catalyst was varied by 45-106, 106-212 and >212 μm. The leaching percentage of Ni from the spent catalyst was found to be highest (97-98%) with varying particle size. However, the leaching yield for rest of the metals like Al, Fe, V and Mo was 70-74%, 66-85%, 33-43% and 22-45%, respectively. Influence of particle size was predominant on the recovery of all metals except Ni. Assessment of the generation of the bioleach residue after bioleaching showed a weight loss of 54-62% due to the dissolution of the metal values from the spent catalyst. The mineralogical study conducted by X-ray diffraction and scanning electron microscopy supports the dissolution of metals from the spent catalyst. Jarosite mineral phase was the dominant mineral phase in the bioleach residue due to the dissolution of the oxidic and sulfidic mineral phases present in the feed spent catalyst.
Recovery of copper values from bio-heap leaching of low grade Malanjkhand chalcopyrite ore
Lala Behari Sukla,Kailash Chandra Nathsarma,Joystna Rani Mahanta,Sradhanjali Singh,Snehasis Behera,Karanam Srinivas Rao,Tondepu Subbaiah,Barada Kanta Mishra 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
M/S Hindustan Copper Limited (HCL), India generates large amounts of lean sulfide ores of copper. The current production of lean copper ores in India is 0.55 million tons with ~0.3% average copper content. Heap-bioleaching of the lean copper ores in 15 and 30 ton scales was undertaken at IMMT, Bhubaneswar. The leaching study showed 0.09% dissolution of copper from the ore body per day. The leach liquor was processed through solvent extraction and electrowinning. Extraction of copper from the actual leach liquor was carried out with 1.5% LIX 622N in kerosene with zero co-extraction of iron. The copper-free raffinate was fed back to the leaching unit. Stripping of copper from the loaded organic was carried out with 180 kg/㎥ H2SO4. The copper pregnant electrolyte was passed through a carbon column to make it free from entrained organic and was fed to the electrowinning unit. The increase in current efficiency was due to the increase in the concentration of electrolyte. The energy consumption was 1.7 kWh/kg at a flow rate of 4.5 L/h. Smooth and bright sheets of copper of 99.99% purity were obtained.