Determination of ash in coals unusually high in calcite and pyrite
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Coal -- Anal
|Statement||by O.W. Rees and W.A. Selvig, in cooperation with United States Department of Interior, Bureau of Mines ... Printed by authority of the state of Illinois.|
|Series||Illinois. State geological survey. Report of investigations, no. 81|
|Contributions||Selvig, W. A. 1886-, United States. Bureau of Mines.|
|LC Classifications||TP325 .R39|
|The Physical Object|
|LC Control Number||gs 42000236|
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Determination of ash in coals unusually high in calcite and pyrite. The determination of ash by the cold furnace method (B and F) gave duplicate results within A. tolerances for all samples in the U. Bureau of Mines laboratory and for samples up to about per cent mineral carbon dioxide content in the Illinois Geological.
DETERllIINATION OF ASH IN COALS UNUSUALLY HIGH IN CALCITE AND PYRITE N DETERMINING ash in coals containing uiiusually large amounts of calcite and pyrite, diffic~xlty in obtaining satis- factory results by the standarcl A.S.T.M.
procedure (3)"nay be euperiencecl, be- cause of the varying amounts of sulfur. statfofillinois or departmentofregistrationandeducation or divisionofthe stategeologicalsurvey urban a.
Additional Physical Format: Online version: Rees, Orin Wainwright, Determination of ash in coals unusually high in calcite and pyrite. Urbana, Ill., Enter the password to open this PDF file: Cancel OK.
File name:. In the determination of ash, particularly in coals containing appreciable amounts of pyrite and calcite, there is danger that the ash will retain indefinite amounts of sulfur which causes erratic results. The () calcite, () quartz, () pyrite, and () Al 2 O 3 peaks (and any additional peaks for which standards have been prepared) are measured for coal LTA.
Peak area ratios are then calculated, and the percentage of each mineral (calcite, quartz, pyrite, etc.). Complete quantitative data of the chemical (proximate, ultimate, and ash analyses) and mineral (in low-temperature ash (LTA) and various high-temperature ashes (HTA)) compositions of 21 coals were used to investigate the modes of occurrences and high-temperature behaviors of the minerals in coals and their influence on ash fusibility.
of coal. A greater mass of high ash coal must be used to provide a given amount of heat due to dilating effect of the non carbonaceous components.
Also, greater amount of waste need to be removed after utilization . Thus the lower amount of ash in coal is extremely important for coal’s purity and high. The proportions of low-temperature (oxygen-plasma) ash in the coal samples were found to be wt%, compared to the (high-temperature) ash yields of wt%, as determined by proximate analysis.
The difference is largely because many of the minerals (kaolinite, calcite, dolomite, pyrite, siderite and illite) in the coal. DETERMINATION OF MINERALS IN COAL BY METHODS BASED ON THE.
Table 2 SiO K CO 2 where j j 3. RESULTS AND DISCUSSION CHARACTERIZATION OF COAL AND ASH SAMPLES Proximate and chemical bulk analyses of coal samples are given in Table 2. Ash content (A), volatile matter (VM) and chemical analyses of coal are related to the coal dry basis.
basin (e.g., calcite, siderite), and secondary phases disseminated or filling cavities, cracks, and cleats (e.g., calcite, pyrite, quartz, clay, sulfates) generated during coalification of the deposit The geological framework of coal deposits makes the co-excavation of coal with the intercalated barren layers unavoidable, substantially.
The major oxides present in the coal and beneficiated coal ashes include Fe 2 O 3, Al 2 O 3, SiO 2, CaO, and MgO, which significantly affect the ash fusion temperature ranges. Initial deformation temperature (IDT) changes with the ash components and, increases with the increase in the Fe 2 O 3 content in coal ash.
Four coals containing iron mineral pyrite (FeS2) and siderite (FeCO3) were combusted in a laboratory drop tube furnace at temperatures of, and °C under oxidizing and reducing conditions. Results for the behavior of pyrite mineral were in agreement with the established literature.
The behavior of siderite mineral was determined and comparisons made. The coal-chars, derived from parent coals with nearly 80% inertinite and with high concentrations of an ash 48 and 67%, respectively, were found to have very low porosities (coal-chars ash shows the presence of a large amount of kaolinite and quartz and above average amounts of pyrite and calcite.
Chemical compositions of the high-temperature ash (HTA) of coal samples were determined by X-ray fluorescence (XRF) spectrometry technique. clay minerals, calcite, pyrite, and gypsum.
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ASTM, Annual Book of AST The new phase of mullite formed is the main reason of high fusion temperature of coal ash samples. [Show full abstract] kaolinite, illite, pyrite, calcite, gypsum. This test method covers the determination of the inorganic residue as ash in the analysis sample of coal or coke as prepared in accordance with Practice D or Practice DThe results obtained can be applied as the ash in the proximate analysis, Practice D, and in the ultimate analysis, Practice DFor the determination of the constituents in ash, reference is made to Test.
The minerals originally present in the coals (quartz, kaolinite, illite, pyrite, calcite, gypsum, dolomite, and sphalerite) were all altered to higher temperature phases. Several of these phases, including kaolinite, metakaolinite, mullite, anhydrite, and anorthite, were found only in limited temperature ranges.
Difficulty may be experienced in securing satisfactory determinations of ash for coal unusually high in calcite and pyrite. Gradual initial heating is necessary to avoid mechanical loss from a too rapid expulsion of the volatile matter. Caution: It is necessary to use the ventilation hood.
detected in pyrite and clay grains from Pittsburgh #8 coal. Ash samples show a similarly heterogeneous distribution of trace metals. Hg has been detected at up to ppm in 24% of aluminosilicate. particles analyzed in ash from Absaloka coal, a subbituminous Montana fuel. The physical and chemical propenies of coal ash are determined by reactions thar occur during the high-temperamre combustion of the coal and subsequent cooling of the flue gas.
Description Determination of ash in coals unusually high in calcite and pyrite FB2
A consider able amount of research has gone into understanding how coal ash forms, its characteristics, and how it. The results show that Dongpo coals are enriched in Ga and Li compared to the average values for world hard coals, and they are depleted in Al 2 O 3 compared to Chinese coals.
The coal low temperature ash contains kaolinite, illite, quartz, calcite, pyrite, and to a lesser extent, chlorite, plagioclase, dolomite, ankerite, and apatite. CLAIMS: 1.
A method of determining iron. pyrite or ash content of coal, comprising measuring the attenuation or scattering by a coal sample of 14 kV 57 gamma rays from a Mossbauer source of Co in a non-magnetic metallic matrix, characterized in that the measuring is performed both with the source at rest or vibrating with a peak speed of less than lmm/sec and also with the source vibrating.
With respect to the coal rank, the dry, ash-free percentage of volatile matter (VM daf) calculated from values in Table 1 of Qin et al. ranges from to %.1 If the highest ash sample, with % ash (air-dried basis), is excluded, the range only extends to % VM daf.
This is similar to the range of. The strata overlying and underlying the No. 1 Coal contains high organic matter, and thus they are mined together with the coal as feed coals for local power plants, although the ash yield in these strata are over than 50% (from 54% to 72% and % on average) and are not generally considered to be coal.
Nevertheless, the ash content of American coal, Lafia-Obi and Chikila coals are relatively lower than the ash content on dry basis of the pulverised coal used in this study. Similarly the low ash content is an improvement on the coking quality, low ash content is an essential requirement for coke making coals [.
The present study aimed to characterize the coal in the area under study through chemical composition utilizing the parameters through proximate and ultimate analyses. The analytical evaluation of properties such as moisture, volatile matter, fixed carbon, and ash forms the proximate analysis.
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In the present study the moisture content in the coals samples ranges between and. The Blue Gem high volatile bituminous coal samples are unusual low in ash. The Blue Gem coal for Silicon metal production is a low ash sample The ash in the Blue Gem coal samples are mostly from disseminated clay and pyrite minerals.
The Wawel coal is a medium/high volatile FeSi coal from Poland, with a volatile content of % daf. RI 81 Determination of Ash in Coal Unusually High in Calcite and Pyrite.
10p. RI Correlation of Domestic Stoker Combustion with Laboratory Tests and Types of Fuels. Combustion Tests and Preparation Studies of Representative Illinois Coals. 62p. RI Chemical Characteristics of Banded Ingredients of Coal.
9p. Concentrations of iron minerals such as pyrite and siderite give high densities, often in thin beds, contrasting with surrounding rocks. Shale Densities of shales vary between and g/cm 3 or more, increasing with compaction induced by age and depth of burial (Figure 1).From three coals from Upper Silesian Basin (Czech Rep.) the fractions with low ash content were prepared.
Those fractions from Dukla coal ( - g/cm 3), ěten coal ( - g/cm 3) and Staříč coal .The isotopic compositions of calcite indicates at least two, possibly three, stages of calcite formation in the Upper Freeport coal bed.
Calcite samples obtained from cleat, and isolated from 8x mesh specific gravity sink fraction and mesh size fraction, are enriched in /sup 13/C.
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