The arsenic concentrations in 297 coal samples were collected from the main coal-mines of 26 provinces in China were determined by molybdenum blue coloration method. These samples were collected from coals that vary widely in coal rank and coal-forming periods from the five main coal-bearing regions in China. Arsenic content in Chinese coals range between 0.24 to 71 mg/kg. The mean of the conce...

these days, most of the marine structures which are constructed and used in persian gulf, are made of st37 steel. due to oil and gas sources excavated, the number of these structures is constantly increasing. on the other hand, these types of structures are exposed to corrosive environments and it is seriously critical for these structures to be used for many years. coal tar epoxy (trade name),...

DiMichele, W.A. and Phillips, T.L., 1985. Arborescent lycopod reproduction and paleoecology in a coal-swamp environment of late Middle Pennsylvanian age (Herrin Coal, Illinois, U.S.A.) Rev. Palaeobot. Palynol., 44: 1—26. The arborescent lycopods dominated many coal-swamp plant communities of the Middle Pennsylvanian. A relatively small number of important species occurred in coal swamps, each w...

Many research studies have been conducted on the liberation of locked minerals using a crusher and comparing this device with the other devices. This paper reviews the liberation of middle coal by different methods of crushing force. In the Tabas coal washing plant, particles of 0.5-50 mm size are processed through the heavy media method (using 3 Tri-flo separators) and particles of 0-0.5 mm si...

The association of coal and oil shale had been a hot topic for a long time. Various types of association of coal and oil shale can be found in one basin, for instance, the coal can act as the roof or floor or interlayer of the oil shale, etc. The most crucial factor for the formation of oil shale is stratification and seasonal blooming of lower plankton, while the final formation of the coal st...

The calcareous concretions studied formed in different depositional environments associated with the Pcnnsylvanian eyclothems of cast central Ohio. The late syngenetic to early diagenetie coal balls from Lower Frecport Coal in Jefferson County were formed by cellular permineralization of decaying terrestrial plants in a peat swamp. These coal balls, composed of N9.N% calcite, 7.0% pyrite, and 2...

introduction the alborz structural zone in northern iran is the host of a number of important coal deposits. the gheshlagh coal mine is one of them, which is located 35 km southeast of azadshahr. coal bearing strata in the gheshlagh mining district occur in the middle part of the lower jurassic shemshak formation which consists mainly of shales, siltstones and sandstones. the geshlagh coals hav...