Advanced Materials and Processes Research Institute
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Mineralogical investigations on an Indian glauconitic sandstione of Madhya Pradesh State.
No full textGlauconitic sandstone occurring in Majhgawan, Madhya Pradesh (India) was examined to study the composition and association of glauconite with different minerals. The study was carried out by petrographic investigation, X-ray powder diffraction (XRD), simultaneous thermal analyses (STA) and infrared (IR) spectral method. With a majority of quartz grains, glauconite pellets (both clear and limonitized) along with a smaller percentage of potash feldspars and mica minerals are found embedded in a mixed ferruginous and glauconitic matrix. The nature of (001), (020) and (003) spacings as found in the XRD patterns obtained for different fractions of the sample suggests the presence of disordered glauconite in the glauconitic sandstone. XRD identification is amply supported by endotherms at 560 degrees C in differential thermal analysis (DTA) curves representing loss of constitutional water from the glauconite structure. Appearance of endotherms in DTA curves in the 275-353 degrees C temperature range indicates the presence of poorly crystalline goethite, which is also substantiated by the absence of characterstic d lines of goethite in XRD patterns. On heating the sample to 760 degrees C, (001) reflection of kaolinite disappears and further heating to 1000 degrees C causes collapse of the glauconite structure also. Formation of hematite takes place in the sample heat-treated at 1000 degrees C. The results demonstrate a clear rising trend of glauconite and kaolinite contents and diminishing proportions of quartz with the reduction in the particle size of the sample
A simple equation for sink-float data.
No full textThe published results of the sink-float data on coals of different origins have been analysed for smoothing and interpolation. The cumulative weight fraction of material floating and the ash content of the float fraction were used to estimate the recoveries of “non-ash” and “ash” material at each relative density level. A simple equation was then derived relating recovery to the relative density. Further, it has been shown that these equations can be used for the purpose of interpolation thereby reducing the need for carrying out sink-float tests at several relative density levels
Variation in magnetic properties of hard ferrites prepared from blur dust of Bailadila, M.P. with the initial raw material composition.
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The effect of internal pressure on a penny-shaped crack at the interface of two bounded dissimilar micropolar elastic half-spaces.
No full textIn the linear theory of micropolar elasticity, the problem of a penny-shaped crack at the interface of two bonded dissimilar micropolar elastic half spaces is studied. The problem is first reduced to a system of dual integral equations which are further reduced to the solution of Riemann-Hilbert problem. Further stresses at the rims of cracks and in the vicinity have been evaluated
Indexing the washability characteristics of coal.
No full textThe washability data on coals of different origins have been analysed in terms of relation between the cumulative weight fraction of feed material floated and the recovery of non-ash and ash material in the float fraction at a given specific gravity. It has been noted that a unique recovery curve exists for both the recoveries of non-ash and ash material when plotted against the cumulative weight fraction of feed material floated. On the basis of this observation, a simple “Index of Washability” has been developed. An explicit mathematical expression has been derived to estimate the index value for a given coal.\u