B.K. Mishra

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

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Publications (204)212.71 Total impact

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    ABSTRACT: In fusion and fission reactor material development, ODS alloys are the most suitable candidate materials due to its high temperature creep properties and irradiation resistance properties. This paper describes the preparation of oxide dispersion strengthened alloy powder in large quantity (>1 kg batch) in dual drive planetary ball mill using pre-alloyed ferrtic steel powder with nano sized Y2O3. The consolidation of the powders was carried out in hot isostatic press (HIP) followed by hot rolling. 99% of the theoretical density was achieved by this method. The vickers hardness values of pressed and rolled samples were in the range of 380 ± 2HV and 719 ± 2HV, respectively. Samples were further investigated using X-ray diffraction particle size analyzer and electron microscope. Initial increase in particle size with milling was observed showing flattening of the particle. It was found that 5 h of milling time is sufficient to reduce the particle size to achieve the desired size. Transmission electron microscopy analysis of milled ODS steel powder revealed a uniform distribution of combustion synthesized nano-Y2O3 in ferritic steel matrix after a milling time of 5 h. Preliminary results demonstrated suitability of dual drive planetary ball mill for mass production of alloy within a short time due to various kinds of forces acting at a time during milling process. Fine monoclinic Y2Si2O7 precipitates were also observed in the steel. This study explains the particle characteristics of nano Y2O3 dispersed ODS powder and formation of nano clusters in ODS ferritic alloy.
    No preview · Article · Jan 2016 · Fusion Engineering and Design
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    ABSTRACT: Nanocrystalline Y2O3 was synthesized by a modified combustion technique using a mixture of glycine and citric acid as fuel. The microstructural characterization of resultant powder was carried out by means of XRD. A detailed investigation was conducted on the XRD peak broadening of Y2O3 using Williamson-Hall method by assuming three models namely uniform deformation model, uniform stress deformation model, and uniform energy density deformation model. The crystallite size, lattice strain, lattice deformation stress, and lattice deformation energy density of Y2O3 were determined from the plots. The internal stresses and internal strains in the crystallites were estimated according to Griffith model with the help of dislocation density obtained from XRD analysis. The observed lattice contraction of nanocrystalline Y2O3 was ascribed to the surface stress, which was further used for estimating surface strain and surface energy. TEM analysis also included to compare the results.
    No preview · Article · Jan 2016
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    ABSTRACT: The present study evaluates the possibility of selective leaching of manganese from complex, manganese and iron oxy-hydroxide based sea bed nodule utilising micelles in high temperature acid dissolution process. Application of surfactants during acid leaching of manganese nodules are described based on results from leaching studies. The factors that affected the sulfuric acid leaching of the manganese nodules in the presence of various surfactants were investigated. The effect of anionic (SDS-Sodium Dodecyl Sulphate), cationic (CTAB-Cetyl Trimethyl Ammonium Bromide) and nonionic (Triton-X 100) surfactant on the various metals extraction with respect to sulfuric acid concentration, temperature, type of surfactants and surfactant concentration is reported. Among them, CTAB showed highest improvement in the recovery of Cu, Ni, Co, Zn and Mn. Iron, aluminium, and silica were removed effectively through the present approach of high temperature sulfuric acid leaching route assisted by surfactant. Increasing the temperature of the medium has significant impact in the selective leaching of Mn, Cu, Ni and Co. The optimum conditions established for maximum metal extraction are: pulp density 10%, time 2 h, temperature 160 °C, sulfuric acid 5.0% (v/v) and at critical micellar concentration of CTAB. Under these conditions, recovery of Mn was 99% along with the (˃99%) recovery of Cu, Co, and Ni. The leached residues were analysed and their phase and morphologies were included herein. The present process may find application of separation of manganese from iron and aluminium at high temperature during various hydrometallurgical treatment of manganese based ores.
    No preview · Article · Dec 2015 · Hydrometallurgy
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    Rohit Kumar · R. Sakthivel · Reshma Behura · B.K. Mishra · D. Das
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    ABSTRACT: Magnetite nanoparticles were synthesized from iron ore tailings; - a mineral waste collected from the iron ore processing plant. Mechanical milling followed by chemical route is employed to obtain the magnetite nanoparticles from the waste. The magnetite nanoparticles were characterized by X-ray diffractometer, Field Emission Scanning Electron Microscope, Fourier Transform Infrared Spectrometer and Vibrating Sample Magnetometer. X-ray diffraction pattern confirms the existence of a magnetite phase. Field Emission Scanning Electron Microscopic (FE-SEM) pictures reveal that the particle size is below 100 nm. Fourier Transform Infrared (FTIR) spectrum shows a band at 570 cm-1 for the Fe-O bond vibration. Vibrating Sample Magnetometric (VSM) study shows high saturation magnetization value of 60 emu/g at low applied magnetic field. Silver coated magnetite nanoparticles exhibits antibacterial property whereas bare magnetite does not.
    Full-text · Article · Oct 2015 · Journal of Alloys and Compounds
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    C.Eswaraiah · N.Venkata · B.K.Mishra · Ralph Holmes
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    ABSTRACT: Comminution is an energy intensive process. A small change in efficiency can lead to substantial benefits in an overall economy of the process plant. This study focussed on the comparison of vertical stirred mill agitator designs. A double helical screw agitator was designed for this purpose. A series of stirred mill experiments were performed with two types of agitator designs a standard pin type and CSIRO’s designed double helical screw stirrers. The effects of operating parameters such as grinding time, stirrer speed and pulp density on grinding performance was investigated using a magnetite concentrate. Grinding performance was analysed by considering the product fineness and the energy consumption. The test results show that the grinding time and stirrer speed played a significant role, however, the pulp density had little impact on grinding performance in both cases of agitator designs. The 80 % passing target product size of 38 μm was obtained with double helical screw agitator in 20 min of grinding with an expend of 10.53 kWh/t specific energy. Whereas, the target product size of 38 μm was achieved with the pin type stirrer at the rate of 21.73 kWh/t. It is evident that grinding in a vertical stirred mill with a double helical screw is more efficient than that using a pin type stirrer in terms of the product size distribution and the specific energy consumption. It is concluded that the double helical screw design provides better energy efficiency compared to the pin type stirrer design. The models were developed for the responses P80 and Ecs. Both models show high regression coefficients thus ensuring a satisfactory of models with experimental data. The model equations developed were then optimized using a quadratic programming to minimize the P80 size at minimum specific energy.
    Full-text · Article · Jul 2015 · Separation Science and Technology
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    ABSTRACT: Yttrium oxide (Y2O3) is one of the most stable oxides to withstand at high temperature and suitable for use as a dispersoid in oxide dispersion strengthened (ODS) steel alloy. In this paper, Y2O3 nano-powders are synthesized by three different techniques namely mechanical milling, single fuel combustion synthesis and mixed fuel combustion synthesis. In mixed fuel, various combinations of fuels are used instead of a single fuel (glycine, citric acid, urea, and ethylene glycol). Thermal characteristics and crystalline nature of Y2O3 nano powders produced by different techniques are analyzed extensively. Y2O3 nano powders with amorphous to nano-crystalline structure and having 8–80 nm crystallite size are obtained from the mixed fuel process, that is suitable for use as dispersiod in ODS steel. Further, these powders are dispersed in ferritic steel matrix using an innovative dual drive planetary ball mill to produce Y2O3 dispersed ODS steel powder within a short time period. Transmission electron microscopy analysis of milled oxide dispersion strengthened steel powder reveals a homogeneous distribution of Y2O3 nano powders in ferritic steel matrix after milling time of 5 h.
    No preview · Article · Jul 2015 · Advanced Powder Technology
  • S. Behera · S. Patel · B.K. Mishra
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    ABSTRACT: In an attempt to improve the quality of the waste paper in recycling in paper manufacturing, sisal (a hard fiber) is blended with. The proximate analysis of sisal fibre has been compared with that of the kenaf and waste paper. A high cellulose content in sisal (67.19%) than the kenaf bast fibre (63.5%) and a slightly less lignin percent of sisal (10.22) in comparison to kenaf (12.7) suggest the suitability of sisal fiber for better pulping efficacy and hence paper making. The high tensile strength of sisal fiber is an important cause for blending with weak recycled fibers of waste paper. The preparation of strong paper has been optimized by varying the amount of constituents and modifying sisal fibers.
    No preview · Article · Jul 2015 · Journal of scientific and industrial research
  • 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.
    No preview · Article · Apr 2015 · Acta Metallurgica Sinica (English Letters)
  • C.Eswaraiah · N.Venkat · B.K.Mishra

    No preview · Conference Paper · Mar 2015
  • B. Ghosh · M.K. Ghosh · P. Parhi · P.S. Mukherjee · B.K. Mishra
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    ABSTRACT: The rapid proliferation of electronic devices in the last two decades has compelled the researchers to find a remedy for one of the most toxic and hazardous waste materials – the waste Printed Circuit Boards. Numerous articles have been published demonstrating the process routes for recycling of this toxic but otherwise useful waste due to nearly 30% metal content. In this paper, more than 150 related articles mostly published in the last 15 years and covering the broad areas like characterization of waste Printed Circuit Boards, health hazards associated with the processing and the different routes of recycling have been analyzed to provide a comprehensive overview on this topic. Physical separation processes employing electrostatic separator, magnetic separator, froth floatation, etc., has been reviewed for separation of metals and non-metals, along with useful utilizations of the non-metallic materials. The recovery of metals from this waste material through pyrometallurgical, hydrometallurgical or bio-hydrometallurgical routes is also critically discussed.
    No preview · Article · Feb 2015 · Journal of Cleaner Production
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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.
    No preview · Article · Jan 2015 · Minerals Engineering
  • E Priyadarshini · N Pradhan · P K Panda · B K Mishra
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    ABSTRACT: The ability of self-functionalized biogenic GNPs towards highly selective colorimetric detection of rare earth element cerium is being reported for the first time. GNPs underwent rapid aggregation on addition of cerium indicated by red shift of SPR peak followed by complete precipitation. Hereby, this concept of co-ordination of cerium ions onto the GNP surface has been utilized for detection of cerium. The remarkable capacity of GNPs to sensitively detect Ce without proves beneficial compared to previous reports of colorimetric sensing. MDL was 15 and 35ppm by DLS and UV-vis spectroscopy respectively, suggesting DLS to be highly sensitive and a practical alternative in ultrasensitive detection studies. The sensing system showed a good linear fit favouring feasible detection of cerium in range of 2-50ppm. Similar studies further showed the superior selectivity of biogenic GNPs compared to chemically synthesized counterparts. The sensing system favours on-site analysis as it overcomes need of complex instrumentation, lengthy protocols and surface modification of GNP. Copyright © 2015 Elsevier B.V. All rights reserved.
    No preview · Article · Jan 2015 · Biosensors & Bioelectronics
  • H. Sahoo · S.S. Rath · S.K. Jena · B.K. Mishra · B. Das
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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.
    No preview · Article · Jan 2015 · Advanced Powder Technology
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    K. C. Sabat · R. K. Paramguru · S. Pradhan · B. K. Mishra
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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.
    Full-text · Article · Dec 2014 · Plasma Chemistry and Plasma Processing
  • S.K. Jena · N. Dhawan · D.S. Rao · P.K. Misra · B.K. Mishra · B. Das
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    ABSTRACT: Nepheline syenite is a complex rock consisting of different mineral phases such as nepheline, alkali feldspar, and biotite. It is a promising source for the recovery of potassium and alumina values. India is importing most of its potassium demand from the global market. An attempt is therefore made to extract potassium values from nepheline syenite available in the state of Odisha. It contains 2.8% Fe2O3, 19.9% Al2O3, 55.5% SiO2 and 5.4% K2O as its prime constituents. Magnetic separation and flotation techniques are found unsuitable to recover appreciable amounts of potassium values. Chemical leaching with dilute sulphuric acid could recover only ~ 40% of the potassium values. The potassium values present in nepheline syenite are unlocked through roasting with calcium chloride followed by water leaching. In this approach, it is possible to recover ~ 99.6% K2O value at 900 °C temperature and 30 min of roasting time. The results indicate that the use of planetary mill grinding prior to roasting is favorable for potassium extraction due to mechanical activation of the potassium bearing phases. The different mineral phases present in the feed and the leach residue have been characterized by using optical microscope, XRD and SEM-EDX which shows a phase conversion of locked potassium into sylvite which is soluble in water.
    No preview · Article · Dec 2014 · International Journal of Mineral Processing
  • S.D. Muduli · B. Nayak · B.K. Mishra
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    ABSTRACT: Geopolymers are aluminosilicate based binder manufactured by activation of a solid aluminosilicate source material at high alkaline pH. In this research work fly ash, rich in silica and alumina has been used as a source material for manufacture of building brick through geopolymerization technology in presence of alkaline base chemicals consisting of anions of O2-, [OH]1-, Cl1-and [SO4]2-in different concentrations and sodium silicate solution under atmospheric curing. Then study has been conducted to assess the acid resistance property of fly ash geopolymer brick. This work consists in the immersion of fly ash geopolymer brick in solutions of 1% sulfuric acid and 1% hydrochloric acid up to a period of 12 months and evaluation of its resistance in terms of surface corrosion and compressive strength at 3 months intervals. The geopolymer fly ash brick immersed in 1% H2SO4solution has no remarkable change whereas in 1% HCl solution, there was no change in appearance of the brick and did not show any noticeable change in colour and remained structurally intact though the exposed surface turned slightly softer in 1% sulphuric acid solution for long duration of exposure.
  • S. Sahoo · M. Kuanar · S. Patel · B.K. Mishra
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    ABSTRACT: Nineteen physicochemical properties of natural amino acids are correlated by combination of a large number of molecular descriptors considering simple connectivity of atoms, their topological orientations in two dimensions and quantum-chemical molecular descriptors describing interactions among them. All the molecular descriptors are amalgamated to generate the principal components, which are developed from the contribution of each parameter to different extents. To obtain a significant correlation and, thereby an optimized regression model for prediction of the physicochemical parameters, successive exclusion of variable technique has been applied successfully. The physicochemical parameters, not reported for any amino acid earlier, are predicted by using these models.
    No preview · Article · Oct 2014 · Indian Journal of Chemistry Section a
  • S. Mantry · B. B. Jha · A. Mandal · M. Chakraborty · B. K. Mishra
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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.
    No preview · Article · Sep 2014 · Tribology Transactions
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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%.
    No preview · Article · Aug 2014 · Separation Science and Technology
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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.
    No preview · Article · Aug 2014 · Advanced Powder Technology

Publication Stats

1k Citations
212.71 Total Impact Points


  • 2007-2016
    • Institute of Minerals and Materials Technology
      • Department of Advanced Materials Technology (IMMT)
      Bhubaneswar, Odisha, India
  • 2010-2015
    • Sambalpur University
      • Department of Chemistry
      Sambalpore, Odisha, India
    • Minerals Technologies
      Bethlehem, Pennsylvania, United States
  • 2009-2014
    • Council of Scientific and Industrial Research (CSIR), New Delhi
      New Dilli, NCT, India
  • 2005-2011
    • Central Institute of Freshwater Aquaculture
      • Fish Health Management Division
      Bhubaneswar, Orissa, India