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RISS 인기검색어
- 검색키워드
- 저자 : B.C. Meikap (검색결과 5 건)
- 무료
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Iron ore grindability improvement by microwave pre-treatment
P. Kumar,B.K. Sahoo,S. De,D.D. Kar,S. Chakraborty,B.C. Meikap 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
The influence ofmicrowave pre-treatment on grindability of iron ore (Orissa, India) was investigated by grindability tests. SEM analysis characterized the micro-fractures in microwave treated sample. This may be due to the thermal stress cracking resulted from microwave energy pre-treatment. XRD analysis showed the crystalline content of the sample. It was found that the microwave treated iron ore has peak more than that of untreated ore, i.e. the crystallinity increased with the microwave exposure time. The calculation of HGGI indicated increase in the ease of grinding or decrease in grindability index of the microwave treated ore. Grindability test showed that the microwave treated iron ore grinds much more rapidly initially than the untreated ore. The results showed that the breakage function of both microwave untreated and treated iron ore is dependent of the particle size. The grindability increased significantly as a result of microwave pre-treatment with the specific rate of breakage (Si) increasing by an average of 50%. It was concluded that microwave assisted grinding produced good results particularly for grinding characteristics. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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B.K. Sahoo,B.C. Meikap,S. De,M. Carsky 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1
The present study addresses the treatment of microwave energy for rheological characteristics of coal–water slurries (CWS) performed in an online Bohlin viscometer. Detailed experimental investigations were carried out for high ash Indian coal (Jamadoba washery, 38% ash). Experiments were conducted at high power level (900 W) for all the test samples in microwave oven. The exposure times were fixed at 30, 60, 90 and 120 s. Before and after treatment, the test samples were ground and sieved into different fractions for chemical and physical analysis. Central composite design (CCD) was applied to study the influence of particle diameter, solid concentration, microwave (MW) exposure time and shear rate on apparent viscosity for rheology characteristics of coal–water slurry. A quadratic model was developed for apparent viscosity using Design-Expert software. The model was used to calculate the optimum operating conditions for minimization of apparent viscosity. The apparent viscosity (22.83 mPa s)produced at these operating conditions showed an excellent agreement with the amounts predicted by the models.
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An investigation into the influence of microwave energy on iron ore–water slurry rheology
B.K. Sahoo,S. De,B.C. Meikap 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
The transporting of slurries in pipelines depends largely on rheological behavior of the solid–liquid suspension. These rheological properties of slurries are very much influenced by the slurry concentration, particle size distribution and, surface characteristics. The present invention is concerned with the effect of these parameters on slurry rheology using microwave (MW) energy. Microwave pretreatment for rheological behaviour of iron ore-water slurries (IWS) were carried out in an online Bohlin viscometer. Detailed experimental work for Indian iron ore were conducted at power level of 900 W and 30, 60, 90 and 120 s various exposure times in microwave oven. The microwave treated and untreated test samples were ground for rheological characteristic of slurries. It was seen that microwave-treated ore have better rheological properties as compared to untreated ore. This type of slurry is shear thinning and easy to transport as it exhibited pseudo-plastic behavior. The result showed that microwave-treated iron ore have a density lower than that of untreated ore after grinding. Statistical design analysis was employed to develop empirical equations and found to be encouraging and highly considerable.
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Manisha Bal,Remya Chinnamma Jose,B.C. Meikap 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
Radioactive materials are released from the molten core into the containment at the time of a severeaccident in a nuclear power plant (NPP). Filtered containment venting system is a popular and effectivesafety measure installed to obstruct the uncontrolled escape of radioactive materials due to the overpressurization of the containment. Different designs of filtered containment venting system (FCVS) areavailable today, each being the result of extensive research and development varying in one way or theother. This paper gives an elaborate description of the different types of FCVS currently being used, thecurrent usage status in over 17 countries and the legislations regarding it. The recent researches beingcarried out in this field has also been discussed in detail. This present paper focuses on the critical reviewof existing FCVS, reports the challenges faced by it and highlights the potential developments to overcomethe difficulties.
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J.N. Sahu,V.S. Rama Krishna Chava,Shadab Hussain,A.V. Patwardhan,B.C. Meikap 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.4
The present study addresses the methods and means to safely produce relatively small amounts (i.e., up to 50 kg/h) of ammonia. The optimization and simulation study conducted for continuous process and effect of operation conditions like reaction temperature, initial feed concentration and pressure on ammonia production carried out using ASPEN Plus. Also, a computational fluid dynamics (CFD) model was proposed to simulate the hydrolysis of urea for synthesis of ammonia. A series of parametric studies to investigate flow rates, thermal boundary conditions and reactor geometry was performed for hydrolysis of urea and the optimized operating conditions and reactor geometry were obtained. Detailed three-dimensional flow, heat and chemistry simulations of ammonia, carbon dioxide and ammonium carbamate. The study demonstrates that simulation is a useful tool for diagnosing hydrolysis reactor mixing pathologies and for identifying practical countermeasures that could improve process performance.
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