Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 40 for “"Mineral matter"”.
-
Mineral Matter Associated With Illinois Coals
Made available in DSpace on 2014-12-11T18:09:54Z (GMT). No. of bitstreams: 1 7121145.pdf: 5143233 bytes, checksum: 487255e05eaa0afd9ebb0d25f5c413cf (MD5) Previous issue date: 1971
-
Mineral matter effects in coal pyrolysis and hydropyroysis
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1980.
-
Electrocatalytically induced liberation of mineral matter from coal
A new method for demineralizing coal has been developed which is based on the osmotic pressures that occur when electrical double layers overlap. In this technique, coal is exposed to ferric ions in an acidic medium which causes the coal to lose electrons and become positively charged, thereby …
-
Applicability of Factor Analysis to the Determination of Mineral Matter in Coal
… for determining the characteristics of the mineral matter in coal was developed based on two types of factor analysis. Classical factor analysis was shown to identify trends in data sets that are indicative of the mineral phases and data errors. If a data error was identified by classical …
-
Fundamental studies of mineral matter transformation during pulverized coal combustion : residual ash formation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1991.
-
Chemical and Electrochemical Coal Cleaning in acidic medium application and analysis of the process
… Coal Cleaning (CECC) process, designed to remove mineral matter from coal, has been investigated by treating coal samples in acidified slurries. Various coals, characterized by different maceral structures and mineral matter contents, were subjected to several experimental procedures under mild …
-
An evaluation of separation methods for the selective coagulation of ultrafine coal
… coagulating and separating coal from dispersed mineral matter has been developed at Virginia Tech. The process, which is known as Selective Hydrophobic Coagulation (SHC), differs from oil agglomeration, shear or polymer flocculation, and electrolytic coagulation processes in that it does not …
-
Removal of trace elements from coal using a multiple-property processing circuit
… trace elements in coal associate with the mineral matter while others associate with pyrite. Researchers at the Virginia Center for Coal and Minerals Processing have developed a multiple-property processing circuit capable of providing high rejections of ash-forming mineral matter and …
-
A Study of Triboelectrification for Coal , Quartz and Pyrite
… separation efficiency. The premise that coal and mineral matter can be triboelectrically charged differently serves as a basis for the TES process. In order to improve the separation performance, it is apparent that a highly efficient charger is needed for the TES unit, as well as the information …
-
Characterizing Trace Element Associations in the Pittsburgh No. 8, Illinois No. 6 and Coalburg Coal Seams
… design and inadequate liberation of coal and mineral matter. These problems are often difficult to correct in the absence of characterization data regarding the mineralogical association and washability of trace elements in run-of-mine coals. Therefore, the first step in removing the trace …
-
Determination and statistical evaluation of the effect of minerals and mineral associations in specific dense medium fractions on ash fusion temperature
… Fixed Bed Dry Bottom coal gasification, the mineral matter in coal undergoes various transformations. Heat induced transformation due to low ash fusion temperatures leads to agglomeration of the ash particles to sizes varying from tiny particles to lumps larger than 100mm. Channel burning and …
-
An investigation of fine coal grinding kinetics
… can achieve the desired result provided mineral matter is sufficiently liberated. To achieve sufficient liberation, however, it is often necessary to grind to a mean particle size finer than 10 microns. Since conventional ball mills are highly inefficient in this fine size range, the …
-
Design, construction, and evaluation of coal extraction pilot plant to manufacture coal-based carbon pitch
A solvent extraction technique for removing mineral matter, including the inorganic sulfur, from coal has been developed by the Department of Chemical Engineering at WVU. The extraction is preformed at mild conditions (202°C and atmospheric pressure) using the solvent N-Methyl-2-Pyrrolidone …
-
Comparing Newly Built Wetlands in the Atchafalaya Bay, Louisiana and Sacramento-San Joaquin Delta, California
… and soil cores were processed to examine mineral and organic contributions.</p> <p>Elevation change was highly variable, responding to influences from water level, river discharge, storms and vegetation. Mineral matter consistently added more to the marsh soil through volumetric and …
-
Continuous column flotation of ultrafine coal using microbubbles
… (less than 100 microns) to remove ash-forming minerals from micronized coal. The microbubble generator used In this work has been characterized and found to yield a very narrow size distribution. Microbubble column flotation tests have been conducted to study a series of operating variables …
-
Composition and facies variations in mid-cretaceous gates formation coals, Northeastern British Columbia : implications for interpretation of paleo-wetland environments and assessment of coalbed methane characteristics
… gas adsorption characteristics of the coal. On a mineral-matter-free basis, the amount of methane adsorbed generally increases with vitrinite enrichment. Carbon dioxide surface area generally decreases with increased mineral matter and increases with increased vitrinite content. The increase in …
-
The Effect of Switchable Additives on Colloidal Interactions Found in Oil Sands
… present in model oil sand systems. Organic/mineral and mineral/mineral interactions were investigated in the presence of cationic and anionic switchable surfactants, as well as switchable ionic strength additives. Of the additives studied, cationic switchable surfactants caused the greatest …
-
A study of floatation froth behavior
… indicate that the mass flow rate of coal or mineral matter reporting to the product is linearly related to the flow rate of water reporting to the product. This relationship has been used to distinguish the relative contributions of hydrophobic attachment or hydraulic entrainment to the total …
-
Investigation of operating conditions in stirred ball milling of coal
… micronized to liberate the finely disseminated mineral matter. The stirred ball mill is regarded as one of the most efficient devices for micronizing coal. Using a five-inch batch mill, the optimum operating conditions have been determined in terms of media size, feed size, media type, stirring …
-
Accumulation of sediment and radionuclides in tidal marshes of the Murderkill River Estuary, Delaware
… sediment column, the specific contributions of mineral and organic solids and water/entrapped gas were determined from measurements of sediment dry-bulk density and loss-on-ignition. Additionally, grain-size analysis was conducted to determine the textural composition of sedimentary particles …
Page 1 of 2