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Chandra, D.
- Volatile Displacement of Burnt Coals
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad 826004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 6 (1980), Pagination: 306-310Abstract
The volatile displacement of burnt coals has been compared with that of carbonized coals. A relation has been found between volatile displacement of burnt coals and its chemical composition, i.e., carbon and hydrogen contents.Full Text
- Textural Studies on the Ores of Amjhore Pyrite Deposit, Rohtas District, Bihar, India
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 6 (1986), Pagination: 527-530Abstract
The pyrite ore body at Amjhore occurs as a horizontal to sub-horizontal 'bed' composed, in part, of a hard massive variety and, in part, of a more friable disseminated variety of ore. Microscopic studies reveal that the disseminated ore is made up chiefly of large spherules of pyrite (100,.μm to 1200,.μm in dia.) in a matrix of shale containing also dispersed subhedral toeuhedral pyrite (4,.μm to 30 μm in size). Occasionally, large isolated hexahedral grains of pyrite are also present in the disseminated ores. The microscopic studies indicate development of pyrite spherules from initially close-spaced growth nuclei (perhaps of the precursor-mineral pyrite). The spherules and hexahedra of pyrite fuse together to give fise to the massive variety of ore which show such textures on etching. The textural studies alone cannot, however. be used to infer the exact genesis of the deposit.
- Microstructural Studies and Distribution of Mineral Matter in the Macroscopic Ingredients of Coal, Jharia Coalfield, India·: An Appraisal of SEM Study
Authors
1 Department of Geology, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Applied Geology, Indian School of Mines, Dhanbad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 3 (1986), Pagination: 263-273Abstract
Scanning Electron Micrography of the Jharia Coals has been attempted with a view to decipher the enigmatic microstructural features and diversities in distribution of mineral matter in the banded constituents and coal. A wide variation has been observed in the distribution of mineral matter in coal lithotypes. The mineral matter is most abundant in durain; abundant in c1arain and dull clarain, less abundant in bright clarain and vitrain; and rare in fusain. The order of abundance of the mineral matter may be put as; Durain > Dull Clarain > Clarain > Bright Clarain > Vitrain > Fusain.
The microstructural relation of mineral. matter with coaly substances reveals that in durain and elarain, mineral matter is associated as massive impregnation, superficial infilling of micropores and filling of cavities. In vitrain, this occurs mainly iS superficial inlilling of pores, superficial mountings, and in and around cavities. In c1arain mineral matter is mainly confined to dull bands, while bright bands contain sporadic mineral matter. Fusain is almost devoid of inorganic contamination. At places, however, mineral matter is observed filling the cavities of cell fibres and cell lumina.
- Role of Microstructures in the Spontaneous Combustion of Raniganj Coals: A SEM Study
Authors
1 Department of Geology, Banaras Hindu University, Varanasi, IN
2 Department of Applied Geology, Indian School of Mines, Dhanbad, IN
3 Quality Control Department, CCL, Ranchi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 6 (1986), Pagination: 495-497Abstract
The Scanning Electron Micrography of bulk coal samples from Dishergarh, Sirpur and Kajora areas of Raniganj Coalfield has been attempted with a view to find out the role of microstructures in promoting the spontaneous combustion of these coals. Microanalysis of vitrain and c1arain has shown that these bands of R-VIII seam are highly porous as compared to the overlying and underlying seams. Further, finely dispersed pyrite has also been observed filling these micropores. It is concluded that the occurrence of ubiquitous micropores could be a prevalent factor responsible for the spontaneous combustion property of these coals in different ways.- Mineral Impurities in Coal Combustion
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad 826004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 1 (1986), Pagination: 66-66Abstract
No Abstract.Full Text
- Compendium on Updated and Revised Geology of Jharia Coalfield (excluding TISCO and IISCO Properties).
Authors
1 Indian School of Mines Dhanbad 826004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 4 (1991), Pagination: 413-413Abstract
No Abstract.Full Text
- Coal Petrology (Koela Saileki) in Hindi
Authors
1 Chalet, Flat 8, Floor 2, 15, Sura Third Lane Calcutta - 700010, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 1 (1993), Pagination: 104-105Abstract
No Abstract.Full Text