In this work we have tested the fluidized bed desulfurization performance of lime particles obtained by means of a proprietary limestone slow calcination pre-treatment technique. This performance was compared to that of the parent untreated limestone particles. The occurrence of particle fragmentation and attrition during the fluidized bed operation was also investigated with a specific test pr...

The determination of gas content in coal and rock mass is the basic work to predict emission working face mine. Generally speaking, exists body adsorbed state free state, amount accounts for a large proportion. In order explore occurrence lime mass, isothermal adsorption experiments are carried out on K2 K3 limestone Yangquan mining area. show that capacity very small mainly as gas. When temper...

A study was conducted to determine the effect of different limestone particle sizes in layer diets on bone quality characteristics at end-of-lay hens. Calcitic limestone (360 g Ca/kg DM) that is extensively used in commercial poultry diets was obtained from a specific South African source. Limestone particles were graded as small (<1.0 mm), medium (1.0 2.0 mm) and large (2.0 3.8 mm) and include...

The Indonesian province of East Kalimantan is home to some of the largest remaining contiguous tracts of lowland Dipterocarp forest on the island of Borneo. Nest surveys recently conducted in these forests indicated the presence of a substantial population of Eastern Bornean orangutans (Pongo pygmaeus morio) in the Berau and East Kutai regencies in the northern half of the province. The Sangkul...

This study investigated the implications of using two grades of limestone from a paper and pulp industry for neutralization of acid mine drainage (AMD) in a pilot sequencing batch reactor (SBR). In this regard, two grades of calcium carbonate were used to neutralize AMD in a SBR with a hydraulic retention time (including settling) of 100 min and a sludge retention time of 360 min, by simultaneo...

An examination of defluoridation by industrial grade limestone indicated that a combination of precipitation and adsorption of fluoride can be more effective for defluoridation of water. Pre-acidified fluoride water using two edible acids, viz., acetic acid (AA) and citric acid (CA) have been used for treatment by crushed limestone of diameter 3-4 mm to precipitate fluoride as CaF2 in addition ...

Water inrush disasters from the coal seam floor occur frequently due to high water pressure of Ordovician limestone aquifer, multiple aquifers and strong mining disturbance. We presented a model water-resisting key strata (WRKS) investigate mechanism in deep mines. Roof hydraulic fracturing (RHF) for controlling multi-parameter monitoring were proposed validated Xingdong mine Xingtai, Hebei Pro...

The late Paleocene–early Eocene warm greenhouse conditions, characterized by elevated pCO2 levels in the atmosphere and a dramatic increase sea surface temperature, prompted abundant authigenic glauconite formation within shallow marine sediments worldwide lowering net sedimentation rate, increasing organic productivity expanding oxygen minimum zones to oceans. early marginal Cambay Shale Forma...

Cyrtodactylus metropolis sp. nov. from Batu Caves massif, Selangor, Peninsular Malaysia is differentiated from all congeners by having a unique suite of morphological and color pattern characteristics. Remarkably, this species has been overlooked despite a plethora of field studies at Batu Caves from 1898 to the present and no specimens had ever been examined until now. As with all other limest...

Although land mine problems existed in many regions, Bosnia (1995) and Afghanistan (2001) gave the land mine issue a particular sense of urgency. Intended for warfare, these mines remain buried after the end of the conflict. These mines are triggered by civilians causing around 15,000-20,000 victims per year in 90 countries, ICBL (2006). The U.S. State Department estimates that there are around...