B. K. Mishra

Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India

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Publications (213)249.54 Total impact

  • Microbiology for Minerals, Metals, Materials and the Environment, Edited by Abhilash, B. D. Pandey, K. A. Natarajan, 03/2015; CRC Press (16 March 2015)., ISBN: 978-1482257298
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    ABSTRACT: Dumping of low-grade chalcopyrite encompasses several environmental problems. Despite slow dissolution rate, meso-acidophilic bioleaching is preferred for the extraction of copper from such ores. In the present study, meso-acidophilic bioleaching of a low-grade chalcopyrite in presence of an acid-processed waste newspaper (PWp) is discussed for the first time. The study illustrated a strong catalytic response of PWp with enhanced bio-recovery of copper from acid-conditioned chalcopyrite. A maximum of 99.13% copper recovery (0.36% Cu dissolution/day) was obtained in 6 days of bioleaching in presence of 2 gL- 1 PWp in contrast to only 5.7% copper in its absence. FTIR analysis of bioleached residues revealed similar spectral patterns to the original acid-conditioned ore in presence of PWp, thus indicating less development of passivation layer which was also confirmed through a complementary raman characterization of the bioleached residues. Further, a reaction mechanism (chemistry) was proposed suggesting the possible role of PWp as the electron donor under oxygen limiting conditions which facilitated microbial reduction of Fe (III). The resulting biochemical changes provided an energy source for the bacteria, thus allowing free flow of electrons through the ore surface, thus contributing towards enhanced bioleaching of copper.
    Hydrometallurgy 03/2015; 153:98-105. DOI:10.1016/j.hydromet.2015.02.006 · 2.22 Impact Factor
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    ABSTRACT: Modeling the three-dimensional (3D) structures of proteins assumes great significance because of its manifold applications in biomolecular research. Toward this goal, we present MaxMod, a graphical user interface (GUI) of the MODELLER program that combines profile hidden Markov model (profile HMM) method with Clustal Omega program to significantly improve the selection of homologous templates and target-template alignment for construction of accurate 3D protein models. MaxMod distinguishes itself from other existing GUIs of MODELLER software by implementing effortless modeling of proteins using templates that bear modified residues. Additionally, it provides various features such as loop optimization, express modeling (a feature where protein model can be generated directly from its sequence, without any further user intervention) and automatic update of PDB database, thus enhancing the user-friendly control of computational tasks. We find that HMM-based MaxMod performs better than other modeling packages in terms of execution time and model quality. MaxMod is freely available as a downloadable standalone tool for academic and non-commercial purpose at http://www.immt.res.in/maxmod/ .
    Journal of Molecular Modeling 02/2015; 21(2):2563. DOI:10.1007/s00894-014-2563-3 · 1.87 Impact Factor
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    ABSTRACT: h i g h l i g h t s Influence of substrate temperature on the deposition of SnSe has been shown. Seebeck measurements at 275 Ce375 C confirms n-type conductivity. Higher seebeck coefficient has been observed at 350 C deposited film. Decrease in band gap was observed on increasing Tsub and size of the crystallites. a b s t r a c t Tin selenide thin films were prepared by spray pyrolysis technique using tin (II) chloride and selenourea as a precursor compounds using Se:Sn atomic ratio of 1:1 in the starting solution onto glass substrates. Deposition process was carried out in the substrate temperature range of 250 Ce400 C using 1 ml/min flow rate. The films were investigated using X-ray diffraction, field emission scanning electron micro-scopy, Raman spectroscopy, optical absorption and thermoelectric studies. The X-ray diffraction patterns suggest that the major phase is hexagonal-SnSe 2 was present when the deposition was carried out in 275 e375 C temperature range, while for the films deposited in the below and above to this range, Sn and Se precipitates into some impure and mixed phase. Raman scattering analysis allowed the assignment of peaks at ~180 cm À1 to the hexagonal-SnSe 2 phase. The optical absorption study shows that the direct band gap of the film decreases with increase in substrate temperature and increasing crystallite size. The thermo-electrical measurements have shown n-type conductivity in as deposited films and the magnitude of thermo EMF for films has been found to be increasing with increasing deposition tem-perature, except for 350 C sample. 350 C deposited samples shows enhance thermoelectric value as compared to other samples. Thermoelectric study reveal that although sample deposited between 275 C and 375 C are structurally same but 350 C sample is thermoelectrically best.
    Materials Chemistry and Physics 01/2015; 153. DOI:10.1016/j.matchemphys.2015.01.008 · 2.13 Impact Factor
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    ABSTRACT: The study illustrates the first ever use of Aliquat-336 (C25H54ClN), an ionic liquid, in the flotation separation of quartz from hematite. Laboratory flotation studies of hematite, quartz and their synthetic mixture have shown selective collecting action of Aliquat-336 toward quartz. At an Aliquat-336 dosage of 280 g/t, 97% quartz is floated at slightly alkaline pH (∼8), whereas hematite recovery is only 8%. Flotation of the synthetic mixture of hematite: quartz (1:1), with Aliquat-336 as the quartz collector and starch as the hematite depressant, has resulted in an iron concentrate of 63–65% Fe with 85–88% recovery. The reverse flotation behavior of the low grade banded hematite quartzite (BHQ) using Aliquat-336 as the collector has been investigated. It is observed that, iron values up to ∼65% Fe with 60% recovery can be achieved from the ore containing ∼38% Fe. Surface potential measurement and FTIR spectra lead to the indication of electrostatic adsorption between Aliquat-336 and quartz.
    Advanced Powder Technology 01/2015; DOI:10.1016/j.apt.2014.12.010 · 1.64 Impact Factor
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    ABSTRACT: Tin has many important properties and thus it finds wide applications in metal coating, tin plating, alloying, soldering, and plumbing, as well as in the electronic, electrical, and organotin compounds industries, etc. The metal is chiefly produced from the mineral cassiterite, which is generally beneficiated following gravity concentration and flotation techniques. Cassiterite beneficiation has contributed significantly to the understanding of fundamentals in mineral processing. In particular, the influence of particle size in gravity concentration and flotation techniques has been revealed. Basic research on flotation, such as the development of specific surfactants and the adsorption behaviour of these onto mineral surfaces has been performed. In the present review paper, an attempt has been made to summarize the role of particulate properties in gravity concentration and adsorption behaviour of flotation surfactants with regard to cassiterite. Past tin beneficiation plant practices are reviewed in detail including process flowsheet developments which have taken place over time.
    Minerals Engineering 01/2015; 70:178–200. DOI:10.1016/j.mineng.2014.09.009 · 1.71 Impact Factor
  • A. K. Chaubey, B. B. Jha, B. K. Mishra
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    ABSTRACT: Mg-7.6% Al (in mass fraction) alloy matrix composites reinforced with different volume fractions of nanocrystalline Al3Ca8 particles were synthesized by powder metallurgy, and the effect of the volume fraction of reinforcement on the mechanical properties was studied. Room temperature compression test reveals considerable improvement on mechanical properties as compared to unreinforced matrix. The compressive strength increases from 683 MPa for unreinforced alloy matrix to about 767 and 823 MPa for the samples having 20 and 40 vol% of reinforcement, respectively, while retaining appreciable plastic deformation ranging between 12 and 24%. The specific strength of the composites increased significantly, demonstrating the effectiveness of the low-density Al3Ca8 reinforcement.
    Acta Metallurgica Sinica (English Letters) 01/2015; DOI:10.1007/s40195-015-0215-y · 0.43 Impact Factor
  • Metallurgical and Materials Transactions B 01/2015; DOI:10.1007/s11663-015-0301-6 · 1.32 Impact Factor
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    ABSTRACT: Biological sequestration of cadmium (Cd) and retention of adsorbed cadmium as cadmium sulphide (CdS) nanoparticles inside the cell by a lipid-producing green algae Scenedesmus-24 is reported. The microalga was able to grow in the growth media containing 30 mg L−1 of cadmium without any growth inhibition. Adsorption of Cd(II) was dependent on the pH of the medium, initial concentration of cadmium, density of algal biomass (biosorbent dose), and contact time. The adsorption follows Langmuir isotherm pattern with an estimated maximum cadmium adsorption capacity at 50 mg g−1. The kinetics of adsorption followed Lagergren’s pseudo-second-order model. FTIR analysis revealed the presence of different functional groups on the algal biomass which may be responsible for adsorption of Cd(II). After adsorption, the bound metal ions were retained in the microalgal biomass as CdS nanoparticles. Presence of CdS nanoparticle was confirmed by XRD and TEM analysis. The results of the present study conclusively demonstrate that the microalga Scenedesmus-24 may be a promising candidate for sequestration of cadmium from cadmium polluted water and also its recovery as precious CdS nanoparticles.
    Journal of Applied Phycology 12/2014; DOI:10.1007/s10811-014-0499-8 · 2.49 Impact Factor
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    ABSTRACT: The paper reports on reduction of cobalt oxide (Co3O4) to cobalt metal by low temperature hydrogen plasma. Hydrogen flow rate was varied between 1.167 × 10−6 to 2.5 × 10−6 m3 s−1 at a fixed microwave power of 750 W which gave rise to increase in pressure from 1.866 × 103 to 2.933 × 103 Pa and increase in temperature of the plasma-cobalt oxide interface from 823 to 1,039 K. Reduction of cobalt oxide to cobalt occurred in steps: Co3O4 → CoO → Co. The chemical reaction leading to reduction of cobalt oxide to cobalt is found to be first order with respect to hydrogen flow rate. The activation energy for the first stage of reduction i.e. Co3O4 to CoO is found to be 26.2 kJ/mol and that for the second stage reduction of CoO to Co metal is 13.3 kJ/mol.
    Plasma Chemistry and Plasma Processing 12/2014; 35(2). DOI:10.1007/s11090-014-9602-9 · 1.60 Impact Factor
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    ABSTRACT: This study illustrates a density functional theory (DFT) based approach to design the amine collectors with regards to their interaction with the quartz surface. Mechanism of interaction of primary aliphatic amines and their ether and ester derivatives with the quartz surface has been established. Hydrogen bond geometries and adsorption energies as calculated using DFT reveal that ester amines are stronger surfactants compared to the ether amines and primary alkyl amines. Simulation studies carried out for the different amines with number of carbon atoms varying from 10 to 18 suggest that increasing the number of carbon atoms in the alkyl chain enhances the interaction, but not beyond C14 for primary amines and C16 for its ether and ester derivatives. Presence of both ether and ester group in the alkyl chain facilitates its interaction strength. Adsorption strength of C12 amine containing both ether and ester amine is almost equivalent to that of C16 ester amine.
    Minerals Engineering 12/2014; 69:57-64. DOI:10.1016/j.mineng.2014.07.007 · 1.71 Impact Factor
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    ABSTRACT: Alternatives for extraction of potash from nepheline syenite
    International Journal of Mineral Processing 12/2014; DOI:10.1016/j.minpro.2014.09.006 · 1.46 Impact Factor
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    ABSTRACT: Polarization studies have indicated occurrence of three reactions on the cathode surface during precipitation of nickel hydroxide. Out of the three reactions, the nitrite forming reaction followed by conversion to ammonium ion might be the reaction path. The reaction scheme is well supported by the trends in variations in open-circuit potential. Detail prolonged galvanostatic precipitation studies have shown that (OH)−/Ni2+ ratio plays an important role in determining the phase of the nickel hydroxide. A ratio of (OH)−/Ni2+ higher than 6 with sufficient nickel ion in bath ensures β-nickel hydroxide with bigger particles and lesser H2O molecules within. Maintaining these ratios at lesser levels forms α-nickel hydroxide with finer size and more H2O molecules within. The mechanism of these products formations has been explained in this paper. It is also observed that finer size with higher surface area and higher H2O molecules in crystal structure results in higher discharge capacity.
    Journal of Power Sources 10/2014; 275. DOI:10.1016/j.jpowsour.2014.10.141 · 5.21 Impact Factor
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    ABSTRACT: Copper slag was subjected to in-depth mineralogical characterization by integrated instrumental techniques and evaluated for the efficacy of physical beneficiation and mixed meso-acidophilic bioleaching tests towards recovery of copper. Point-to-point mineral chemistry of the copper slag is discussed in detail to give better insight into the association of copper in slag. Characterization studies of the representative sample revealed the presence of fayalite and magnetite along with metallic copper disseminated within the iron and silicate phases. Physical beneficiation of the feed slag (~0.6% Cu) in a 2 L working volume flotation cell using sodium isopropyl xanthate resulted in Cu beneficiation up to 2-4% and final recovery within 42-46%. On the other hand, a mixed meso-acidophilic bacterial consortium comprised of a group of iron and/or sulfur oxidizing bacteria resulted in enhanced recovery of Cu (~92-96%) from the slag sample. SEM characterization of the bioleached slag residue also showed massive coagulated texture with severe weathered structures. FE-SEM elemental mapping with EDS analysis indicated that the bioleached residues were devoid of copper.
    Korean Journal of Chemical Engineering 10/2014; DOI:10.1007/s11814-014-0298-6 · 1.24 Impact Factor
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    ABSTRACT: The abrasive wear characteristics of plasma-sprayed nanostructured yttria-stabilized zirconia (YSZ) coatings on Inconel 718 substrates was evaluated using AFS 50/70-grade silica sand as abrasives. This article depicts the dependence of abrasive wear characteristics of plasma-sprayed nanocomposite LaCeYSZ coatings on abrading distance, keeping the applied load constant. The influence of four operating parameters—that is, load, wheel speed, time, and temperature with four different levels each—on the performance output (i.e., abrasion wear rate) is studied using Taguchi's L16 orthogonal array design and analysis of variance (ANOVA). Out of the four parameters, load has been found to be most significant factor followed, by speed of the abrasive wheel and temperature influencing abrasion. The morphology of the worn-out surface also showed microcutting and small crater formation in the binder matrix caused by the repetitive impacts of abrasive particles. It was observed that coating with nano-LaCeYSZ grains exhibited higher wear resistance compared to conventional YSZ coating and the reason may be attributed to embedded crack-arresting nanozones, which toughen the coating. An artificial neural network (ANN) approach is then implemented taking into account training and test procedures to predict the triboperformance under different operating conditions. This technique helps in saving time and resources for a large number of experimental trials and successfully predicts the wear rate of the coatings both within and beyond the experimental domain.
    Tribology Transactions 09/2014; 57(5). DOI:10.1080/10402004.2014.923080 · 1.08 Impact Factor
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    ABSTRACT: Two different microbial biosurfactants S9BS and CHBS were isolated from Lysinibacillus fusiformis S9 and Bacillus tequilensis CH. Cytotoxicity effect of these biosurfactants on human embryonic kidney cancerous cell (HEK-293) were studied with the help of 3-(4,5-dimethylthiazol-2yl-)-2, 5-diphenyl tetrazolium bromide (MTT) assay and morphological changes were observed under inverted microscope. The biosurfactants exhibited positive cytotoxicity effect on HEK-293 cell line. It was found that LC50 of S9BS and CHBS were75 μg ml-1 and 100 μg ml-1 respectively. Further cell cycle and apoptosis analysis of biosurfactant treated HEK-293 cell line was done by FACS. In this study, cytotoxicity effect of glycolipid biosurfactant against HEK-293 cell lines is reported for the first time. Mechanism towards membrane permeabilization of biosurfactant treated cancer cell was hypothesized to be most likely by means of incorporation of its lipid moiety into the plasma membrane leading to formation of pores. Hence, these microbial biosurfactants can prove to be significant biomolecule for cancer treatment.
    Applied Biochemistry and Biotechnology 08/2014; DOI:10.1007/s12010-014-1168-8 · 1.69 Impact Factor
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    ABSTRACT: A series of Bi2Se3 films was deposited at different substrate temperature in 150–500 °C temperature range using spray pyrolysis technique, in order to study the effect of substrate temperature on structural and thermoelectric properties. The crystallinity of the as-synthesized sample has been analyzed by X-ray diffraction, which shows the formation of hexagonal Bi2Se3. Scanning electron microscopy examination indicates that the Bi2Se3 microstructure strongly depends upon the change in substrate temperature. The optical absorption study shows that the direct band gap of the film decreases with increase in substrate temperature. The thermoelectrical measurements have shown n-type conductivity in as deposited films and the magnitude of Seebeck coefficient for films has been found to be increasing with increasing deposition temperature. Improved thermoelectric properties at higher substrate temperature shows promising aspect and Bi2Se3 films could be a good thermoelectric material at lower temperature range.
    Materials Chemistry and Physics 08/2014; DOI:10.1016/j.matchemphys.2014.07.039 · 2.13 Impact Factor
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    ABSTRACT: A low grade iron ore containing 51.6% Fe, 17.6% SiO2, 4.3% Al2O3, and 3.8% LOI was subjected to reduction roasting followed by low intensity magnetic separation studies. The phase transformation of hematite into magnetite and fayalite due to reduction roasting was investigated using reflected microscope and X-ray diffraction (XRD) techniques. The effects of reduction variables such as reduction time (40−175 min), temperature (750−1000°C), and reductant dosage (3−11%) using activated charcoal were studied. The process was optimized by using central composite rotatable design (CCRD) and response surface methodology. Iron grade from 59−66% with recovery of 9.5−87% was achieved using CCRD experiments. Model equations were developed both for Fe grade and recovery and then optimized within the bounds of experimental conditions. The program predicted 63.3% Fe with 79% recovery with the following optimum conditions: temperature: 950°C, time: 53.04 min, and reductant: 3%.
    Separation Science and Technology 08/2014; 49(12):1927-1936. DOI:10.1080/01496395.2014.903280 · 1.20 Impact Factor
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    ABSTRACT: Investigations were carried out to understand the design aspects of tribo-electrostatic separator to separate ash from high ash Indian coking coal. Initial studies were aimed to evaluate the different physical, chemical and electrical properties of quartz, kaolinite, and carbon particles. The significant design variables such as plate angle and plate gap were evaluated to effect the optimum separation. The absolute charge acquired by quartz, kaolinite, and carbon were observed to be different. The results indicate that the magnitude of charge increases with the increase in the time of tribo-charging using copper tribo-charging medium. A mathematical model was formulated based on design and operating parameters of the experimental set up to simulate the particle trajectories. The particle trajectories were simulated using measured physical and electrical properties of mineral and carbon particles at experimental design and operating conditions. The simulated trajectories were validated with experimental data. The results of plate position and feed particle temperature indicated that there were optimum conditions to achieve the desired performance. The simulation and experimental results were in good agreement. The optimum separation was achieved at plate inclination of 5°. It was possible to reduce ash content by 10% at 61% yield. Better quality clean coal at 33% ash was achieved from 53% ash feed coal with lower yield.
    Advanced Powder Technology 08/2014; DOI:10.1016/j.apt.2014.08.001 · 1.64 Impact Factor
  • 07/2014; 5(3):207-216. DOI:10.1080/19475411.2014.941041

Publication Stats

716 Citations
249.54 Total Impact Points

Institutions

  • 2007–2015
    • Institute of Minerals and Materials Technology
      • Department of Advanced Materials Technology (IMMT)
      Bhubaneswar, Odisha, India
  • 2014
    • innocomm Research Center for Science & Innovation Communication
      Berlín, Berlin, Germany
  • 2009–2014
    • Council of Scientific and Industrial Research (CSIR), New Delhi
      New Dilli, NCT, India
  • 2008–2014
    • Minerals Technologies
      Bethlehem, Pennsylvania, United States
  • 2013
    • Academy of Scientific and Innovative Research
      New Dilli, NCT, India
  • 2010
    • Sambalpur University
      • Department of Chemistry
      Sambalpore, Orissa, India