A. Grain Size : fine- , medium- , coarse-grained - these modifiers are useful for all metamorphic rocks except slates and phyllites, where a fine grain size is implied by the name. Size are for fine-grained < 0.75 mm , for medium grained 0.75-1 mm , and for coarse-grained 1-2 mm and very coarse-grained > 2 mm . This site uses cookies to improve your experience and to help show content that is more relevant to your interests. By using this site, you agree to the use of cookies by Flickr and our partners as described in our cookie policy.Jun 12, 2018 · The bituminous coal has a major peak at around 45 nm, while anthracite has minor volume distribution in mesopore range (Figure 6a). In micropore range, anthracite has major peaks at around 0.56 nm, 0.77 nm and 0.9 nm, while bituminous coal and lignite have major peak at around 0.84 nm (Figure 6b). If higher pressure, then graphite or pure carbon will form. Image: 79. BITUMINOUS COAL (SEDIMENTARY ROCK) Color: black Grain size:.Aug 15, 2023 · Bituminous coal, a dense sedimentary rock, usually black, but sometimes dark brown, often with well-defined bands of shiny and dull material. It is primarily used as a fuel in the production of steam-electric power and in the production of coke. goes through 5-inch holes, retained by 2-inch round holes. hand firing, gas producers, domestic firing. Nut. through 2-inch holes, retained by 1¼-inch holes. small industrial stokers, gas producers, hand firing. Stoker coal. through 1¼-inch holes, retained by ¾-inch holes.The coal is then left to dry out. It is stored according to size and may be blended, again according to customer specifications. From there it is stockpiled or stored in bins ready for transport by road or rail. Lower quality coal such as sub-bituminous or brown coal can be refined to remove moisture and other impurities.They are a medium-rank coal. Bituminous coals generally have calorific values above 11,500 Btu/lb and volatile matter below 14% (ASTM, Jackson, 1997). In the Illinois Basin (and western Kentucky), however, the lower rank end of what are termed bituminous coals in the United States have calorific values of 11,100 to 11,300 Btu/lb.East Carolina University Department of Geological Sciences East 5th Street Greenville, NC 27858-4353 USA 252-328-6360 | Contact UsGranular Activated Carbon. GC 12×40 is a virgin activated carbon which is granular in form. Made from the finest grades of bituminous coal, it is ideal for many liquid phase applications including the removal of organics from wastewater streams. Manufactured at an NSF/ANSI Standard certified facility, it is suitable for drinking water and food ...All coal and sedimentary rock samples were crushed and sieved to a grain size of ~74 μm (i.e., the top size was 200 mesh) prior to geochemical and N isotopic analyses. Volatile matter contents were determined according to ASTM standard D3175-20 (2020). An elemental analyzer (Vario MACRO) was used to determine the ultimate analysis (i.e., N, C ...IPC Coal can supply various qualities of coal, both washed and unwashed. The specs listed below are based on our averages. We are also capable of blending to assist with special requests. Products on offer: • Run of Mine (ROM) • Peaduff (blend of Duff and Peas) • Duff 0 x 9mm. • Spiral Duff.Geotechnical properties of coal fly ash3.1. Grain size distribution. Grain size distribution, or particle size distribution, is valuable in providing initial rough estimates of a material’s engineering properties such as permeability, strength, and expansivity, as well as its applicability in cement industries and beyond [44, 45].Anthracite Coal : 0.6 - 0.77 weight % Bituminous Coal : 0.7 - 4.0 weight % Lignite Coal : 0.4 weight % Typical Moisture Content in Coal. Anthracite Coal : 2.8 - 16.3 weight % Bituminous Coal : 2.2 - 15.9 weight % Lignite Coal : 39 weight % Typical Fixed Carbon Content in Coal. Anthracite Coal : 80.5 - 85.7 weight % Bituminous Coal : 44.9-78.2 ...The carbon content of bituminous coal is around 60-80%; the rest is composed of water, air, hydrogen, and sulphur, which have not been driven off from the ...15 Agu 2023 ... Bituminous coal is the most abundant and is often burned for heat generation. ... Grain size: Fine grained. Group: Non-Clastic Sedimentary Rock ...Methane (CH 4) and carbon dioxide (CO 2) sorption isotherms have been measured on an Australian subbituminous, a German high-volatile bituminous and a German anthracite coal in the dry and moisture-equilibrated state.The purpose was to study the variation of CH 4 and CO 2 sorption capacities of the dry coals as a function of rank and the influence of water …The effect of grain size of adsorbent on the changes of propylene concentration in the mixture moving through the sorption column filled with a coal sample of grain size: (a) 0.25–0.50 mm, (b) 0 ...Grain size: fine-medium Texture: more glassy in appearance, cleaner to handle than bituminous coal. Formed by "destructive distillation of plant remains," which starts out as peat, then becomes lignite, then bituminous coal, and finally anthracite, by elevated temps and pressures. Bituminous coal is soft and burns hotter and longer. Anthracite coal is harder than Bituminous coal and is not preferred for heating. There are 2 types of Bituminous coals:- 1. Bituminous ...A Wyodak subbituminous coal and an Illinois bituminous coal have been studied as precursors. The ground coals (−850 μm) were reacted with 50% strength H 3 PO 4 (4:1 ratio of acid solution to as-received coal) in two temperature stages. For the subbituminous coal, the first stage involved refluxing the coal-acid mixture for 60 min, following ...The following fuels were used in the comparative tests of co-incineration of bituminous coal with individual solid wastes (ethylene propylene diene monomer EPDM( ), tires, waste paper, polyvinyl chloride, polyethylene): •bituminous coal (grain size: 5-25 mm), from the Kazimierz Juliuszmine in Sosnowiec (coal);9 Sep 2023 ... Their various sizes, from boulders to clay, is referred to as the sediment grain size. ... O Attribution. Bituminous Coal. Bituminous-Coal.jpg.Grain Size. Grain size can be an indicator of the energy of the environment. Generally speaking, higher energy water or wind currents are required to move larger grain sizes. Grain Size, cont’d. Size ranges: small to large; boulders, >256 mm (>1 ft.) cobbles, >64mm (>3 in.) pebbles, >4mm ; granules, 2-4 mm; sand, 1/8-2 mm ; silt, >1/256 mmThis work is part of the effort at the Facility for Adsorbent Characterization and Testing (FACT lab) at the National Institute of Standards and Technology (NIST) to develop reference materials, reference data, and measurement best practices for adsorption metrology. High-pressure surface excess isotherms for CO2 adsorption on NIST Reference Material 8852 …Macroscopic point counting and grain-size measurements show that the bright bands comprise up to 25% of the Morley coal and that those bands have a mean size of −1.73π (3.35 mm) when size measures are converted to −log 2 or phi (π) scale. Microscopic examination of the bright bands show that they are derived from secondary xylem of ...where ρ CO2s = 1.873 kg/m 3 is CO 2 density at standard (surface) conditions, A and h are the area and effective thickness of the coal zone, respectively, ñ C is the bulk coal density (generally ñ C ≈ 1.4 t/m 3), P is pressure, P L and V L are Langmuir pressure and volume, respectively, f a and f m are the ash and moisture weight fraction of the coal, …Sep 19, 2023 · Grain size for bituminous coal? small. What is the shape of rice grain? the same shape as a poo. What are 3 characteristics of a rocks grain? 1.Grain Size 2.Grain Shape 3.Grain Pattern. The CH 4 adsorption capacity of subbituminous coal and medium-volatile bituminous coal increases after scCO 2-H 2 O treatment due to the increases in macropore SSA, ... Coal grain size, temperatures, pressures, and experimental duration. In principle, coal samples used in scCO 2-H 2 O treatments should be higher-quality block coal to …Jan 1, 1994 · Review of Palaeobotany and Palynology, 80 (1994): 85-I 14 85 Elsevier Science B.V., Amsterdam Grain-size and botanical analysis of two coal beds from the South Island of New Zealand J.C. Shearer1 and T.A. Moore2 Canterbury Coal Research Group, Department of Geology, University of Canterbury, Christchurch 1, New Zealand (Received February 9, 1993; revised and accepted June 14, 1993) ABSTRACT ... Coal and gas outburst is an urgent and constantly perplexing problem with coal resource extraction, threatening coal mine safe and sustainable production severely. Its mechanism and the participation of gas in coal breaking are still unclear. To explore this problem, in this paper, gas desorption-diffusion regularity of bituminous coal with …Laboratory batch flotation tests were carried out to determine the effect of grain size on the recovery of four Australian bituminous coals of high and low rank. The flotation concentrates, taken over successive time intervals, and the tailings, were sized and the recovery-size curves plotted. ... the adsorption of reagent on solid particle surface. …Shale is a laminated or fissile clastic sedimentary rock that composed of predominance of silt and clay other minerals , especially quartz and calcite. Characteristic properties of shale is breaks along thin laminae or parallel layering or bedding called fissility. It is most abundant sedimentary rock. The composition (silt and clay) of shale ...O treatment consisted of 200 g of coal particles 92 sieved to a grain size range of 4-8 mm. The details of the high-pressure reactor, coal grain size, and experimental 93 duration used in the ScCO 2-H 2 O treatment can be found in our previous paper [12]. After the ScCO 2-H 2 OAnthracite tailings (i.e., tailings from the higher rank coal) are characterized to have higher absolute densities, coarser grain size distributions, higher hydrophobicity, and less platy particles, compared to bituminous coal tailings. The uniformities of grain size are similar for both coal tailings.Texture (grain size) Coarse (over 2 mm) Medium (1/16 to 2 mm) Fine (1/16 to 1/256 mm) Very Fine (less than 1/256) Composition Calcite Quartz Gypsum Halite Altered plant fragments Clastic Sedimentary Rocks Sediment Name Gravel (rounded fragments) Gravel (angular fragments) Sand Mud Mud Chemical Sedimentary Rocks Texture (grain size) Fine to coars...They are a medium-rank coal. Bituminous coals generally have calorific values above 11,500 Btu/lb and volatile matter below 14% (ASTM, Jackson, 1997). In the Illinois Basin (and western Kentucky), however, the lower rank end of what are termed bituminous coals in the United States have calorific values of 11,100 to 11,300 Btu/lb.The pores in coal and other porous materials are commonly divided into three categories based on the pore diameter, following the International Union of Pure and Applied Chemistry (IUPAC) classification, as micropores (≤2 nm in diameter), mesopores (2-50 nm idiameter) and macropores (≥50 nm in diameter) [].For coal, the macromolecular structure of organic macerals forms an interconnected ...The coal crusher is suitable for crashing bituminous coal, smokeless coal, lignitous coal and freezing coal. ... Grain size of discharging material, ≤30mm ...Dec 15, 2021 · The grain sizes of clastic rock sediments serve as important depositional indicators that are significant in sedimentology and petroleum geology studies. Generally, gamma ray, spontaneous-potential and resistivity well logs are utilized to qualitatively characterize variations in sediment grain size and determine the lithology in clastic reservoirs. However, grain size analysis of modern ... Forms from bituminous coal. Has the highest energy content of all coals. ... Middle-hardest coal, formed from lignite coal, medium/fine grain, alternating dull and ... Bituminous coals and lignites were tested for Hg removal using low-temperature pyrolysis (200-550 degrees C) in laboratory (1 g and 100 g) and bench scale (rotary kiln, 1,5-2 kg/h). The Hg removal ...Abstract. Using a manometric experimental setup, high-pressure sorption measurements with CH4 and CO 2 were performed on three Chinese coal samples of different rank (VR r = 0.53%, 1.20%, and 3.86%). The experiments were conducted at 35, 45, and 55 °C with pressures up to 25 MPa on the 0.354–1 mm particle fraction in the dry state.Bituminous coal is defined as coal having volatile matter of not less than 14.0% on a dry ash-free basis; and a gross specific energy is not less than 26.5 MJ kg −1 on an …bituminous coal, also called soft coal, the most abundant form of coal, intermediate in rank between subbituminous coal and anthracite according to the coal classification used in the United States and Canada.16 Sep 2021 ... X-ray diffraction was used for qualitative analysis of the minerals in coal, and mineral morphology and disseminated particle size were measured ...... particle size < 1/256 mm). Amorphous graphite – Anhedral and very fine-grained ... Steam coal – Trade category of bituminous coal that is used for burning in ...Bituminous Coal - local large concentrations of plant matter which has been buried. Lithification - is the process whereby a newly deposited unconsolidated sediment is slowly converted to sedimentary rock. Diagenesis - all chemical, physical, and biological changes that affect sediment after its initial deposition. Grain Size. Grain size can be an indicator of the energy of the environment. Generally speaking, higher energy water or wind currents are required to move larger grain sizes. ... Takes about 10 ft. of peat to form 1 ft. of bituminous coal. Sedimentary Structures. Provide clues to depositional environments. Some examples: Cross ...Four different metamorphic levels of bituminous coal (long flame coal, non-stick coal, coking coal, and lean coal) were selected as research objects. These four coals were taken from the coal mines of Yuanzigou, Hongliu, Xinzhi, and Zhangcun, respectively. The coal samples collected were crushed by jaw crusher, and six kinds of coal samples …Mechanical Properties of Bituminous Coal Strength of Bituminous Coal. In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation.Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions.Class: Conglomerate may be divided into large lessons: Texture: Clastic (coarse-grained).. Grain size: > 2mm; Clasts easily visible to the naked eye, should be identifiable. Hardness: Soft to hard, dependent on clast …Bituminous coal has been selected for this case study. Bituminous coal is defined as coal having • volatile matter of not less than 14.0% on a dry ash-free basis; and • a gross …Bituminous coal (in Indiana), contains between 69% & 86% carbon by weight Sub-bituminous coal contains less carbon, more water & is a less efficient source of heat Lignite coal, or brown coal, is a very soft coal that contains up to 70% water by weight. Emits more pollution than other coals A Wyodak subbituminous coal and an Illinois bituminous coal have been studied as precursors. The ground coals (−850 μm) were reacted with 50% strength H 3 PO 4 (4:1 ratio of acid solution to as-received coal) in two temperature stages. For the subbituminous coal, the first stage involved refluxing the coal-acid mixture for 60 min, following ...16 Sep 2021 ... X-ray diffraction was used for qualitative analysis of the minerals in coal, and mineral morphology and disseminated particle size were measured ...Jan 5, 2023 · They are a medium-rank coal. Bituminous coals generally have calorific values above 11,500 Btu/lb and volatile matter below 14% (ASTM, Jackson, 1997). In the Illinois Basin (and western Kentucky), however, the lower rank end of what are termed bituminous coals in the United States have calorific values of 11,100 to 11,300 Btu/lb. Abstract. Using a manometric experimental setup, high-pressure sorption measurements with CH4 and CO 2 were performed on three Chinese coal samples of different rank (VR r = 0.53%, 1.20%, and 3.86%). The experiments were conducted at 35, 45, and 55 °C with pressures up to 25 MPa on the 0.354–1 mm particle fraction in the dry state.GRAIN SIZE. COMMENTS. ROCK NAME. MAP SYMBOL. Fine to coarse crystals. Microscopic ... Bituminous Coal forms from the decomposition and compaction of plant remains ...Grain Size. Grain size can be an indicator of the energy of the environment. Generally speaking, higher energy water or wind currents are required to move larger grain sizes. Grain Size, cont’d. Size ranges: small to large; boulders, >256 mm (>1 ft.) cobbles, >64mm (>3 in.) pebbles, >4mm ; granules, 2-4 mm; sand, 1/8-2 mm ; silt, >1/256 mm Coal | Coal. | Jeffrey Beall | Flickr ... Coal.Bituminous coal, the most abundant form of coal, intermediate in rank between subbituminous coal and anthracite according to the coal classification used in the United States and Canada. In Britain bituminous coal is commonly called “steam coal,” and in Germany the term Steinkohle (“rock coal”) is. Grain Size > 2 mm. Clastic Unconsolidated: gravel (rounded), rubble (angular) Consolidated: conglomerate (rounded), breccia (angular) Size Grades (mm): 2-4 granules; 4-64 pebbles; 64-256 cobbles; >256 boulders: Composition of Major Fraction: Volcanic Ejecta (also in grain size 1/256-2 mm category) Chiefly One Constituent As the grain size of undeformed coal decreases, the abundance of 0.5–0.6 nm pores increase. However, a new pore size is added (<0.5 nm) when the grain size is 0.12–0.15 mm, and the pore sizes of other sizes are basically unchanged (Figures 9, 10). Except for the D3 sample always having pores <0.5 nm, the other deformed coal samples ...Grain Size. Grain size can be an indicator of the energy of the environment. Generally speaking, higher energy water or wind currents are required to move larger grain sizes. Grain Size, cont’d. Size ranges: small to large; boulders, >256 mm (>1 ft.) cobbles, >64mm (>3 in.) pebbles, >4mm ; granules, 2-4 mm; sand, 1/8-2 mm ; silt, >1/256 mm Fast moving water can carry materials of different sizes ranging from boulders and gravel to finer materials (sand, silt, and clays). Flowing water also sorts sediments by size and density. High-energy environments include river channels, beach and shallow offshore environments with high wave action, and wave-battered coral reefs …East Carolina University Department of Geological Sciences East 5th Street Greenville, NC 27858-4353 USA 252-328-6360 | Contact Usthe testing, the number of grain-size classes was from 8 to 14. The maximum "plus" class size ranged from 300 to 25 mm, the minimum - 0.05 mm. In the graphical or analytical presentation of the grain-size distribution characteristics, the values of the total "plus" yields are expressed as percentage, that is why the value ofAs a result of its ubiquity geologists have further subdivided it into the grain size categories shown in Table 1. ... Bituminous coals are soft to hard, and dull ...These coal grain compressibilities suggest that the coal volume would decrease by ∼0.543%, ... [51], [52], the permeability should be directly proportional to porosity, grain size, and average pore throat size. While the measured permeability is inversely related to average pore throat size, this reveals that average pore throat size is …The moisture content at maximum RH of 96% was defined as moisture holding capacity of lignite at 30°C. 29 From Figure 5, the moisture holding capacity fell dramatically from 0.225 g/g dry coal in ...A. Grain Size : fine- , medium- , coarse-grained - these modifiers are useful for all metamorphic rocks except slates and phyllites, where a fine grain size is implied by the name. Size are for fine-grained < 0.75 mm , for medium grained 0.75-1 mm , and for coarse-grained 1-2 mm and very coarse-grained > 2 mm . This work is part of the effort at the Facility for Adsorbent Characterization and Testing (FACT lab) at the National Institute of Standards and Technology (NIST) to develop reference materials, reference data, and measurement best practices for adsorption metrology. High-pressure surface excess isotherms for CO2 adsorption on NIST Reference Material 8852 …The coal is then left to dry out. It is stored according to size and may be blended, again according to customer specifications. From there it is stockpiled or stored in bins ready for transport by road or rail. Lower quality coal such as sub-bituminous or brown coal can be refined to remove moisture and other impurities.[11] , Suliestyah et al. produced activated carbon from sub-bituminous with BET surface area of 667 mg/g and iodine number of 1373 mg/g [12], Llado et al. produce activated carbon from lignite coal ... coal grain size, we can see that grain size of 80 mesh shows the highest number of iodine, although it also shows a similar tendency with any …bituminous coal texture and grain size . Exactly how to locate the most effective coal vendors in Indonesia. Indonesia is one of the globe’s top producers and also exporters of coal. In order to find the best vendor, Indonesian customers should take into consideration a couple of points.Given the permeability of coal determined by the network of natural fractures and cleats, and the macropores in coal to large extent, a new model for coal is defined by the producible porosity (PP) model. This PP model is effective for evaluating the relative size of permeability among coal samples with permeability >0.1 mD (Yao et al., 2010a).Their heating values range from 24.423 to 32.564 KJ/Kg. They have a carbon content of 69% to 86% and lower moisture and volatile content than subbituminous and lignite coals, ranging from 2% to 15% and 15% to 45%, respectively.This site uses cookies to improve your experience and to help show content that is more relevant to your interests. By using this site, you agree to the use of cookies by Flickr and our partners as described in our cookie policy.The properties of the coal fly ash depend on the physical and chemical properties of the parent coal, coal particle size, the burning process and the type of ash collector. ... High-volatile bituminous coal due to its high volatile matter content generates high pressure during carbonization which is detrimental to the coke oven walls ([68, 69].Bituminous coal provides approximately 10,500 to 15,000 BTU per pound as mined. Availability: Bituminous coal is abundant. More than half of all available coal resources are bituminous. Mining Locations:Twenty-four typical bituminous coal samples were collected from China, covering the main coal-forming periods and coal-accumulation areas. The geographical distribution of the samples was shown in Fig. 1. The samples were crushed and split following ISO standard “Hard coal and coke - manual sampling” (ISO 18283:2006).However, for the steam coal studied in Ref. [22] and bituminous coals in this study, the positive effect, namely increased content of char compositions with high-porosity (Fig. 8), may be far greater than the negative effects (sum of N 3-1, N 3-2, N 3-3, N 3-4, and N 3-5) at 500°C–600 °C, considering that steam coal in Ref. [22] and bituminous coals …IPC Coal can supply various qualities of coal, both washed and unwashed. The specs listed below are based on our averages. We are also capable of blending to assist with special requests. Products on offer: • Run of Mine (ROM) • Peaduff (blend of Duff and Peas) • Duff 0 x 9mm. • Spiral Duff.O treatment consisted of 200 g of coal particles 92 sieved to a grain size range of 4-8 mm. The details of the high-pressure reactor, coal grain size, and experimental 93 duration used in the ScCO 2-H 2 O treatment can be found in our previous paper [12]. After the ScCO 2-H 2 O
All coal and sedimentary rock samples were crushed and sieved to a grain size of ~74 μm (i.e., the top size was 200 mesh) prior to geochemical and N isotopic analyses. Volatile matter contents were determined according to ASTM standard D3175-20 (2020). An elemental analyzer (Vario MACRO) was used to determine the ultimate analysis (i.e., N, C .... Kevin gwaltney dodge city ks
Pea is used in our Coal Gun coal stoker boiler. Smaller Sizes. Buckwheat: Also known as buck. It is the largest among the smaller sizes and is about the same size as a dime (5/16” to 9/16”). Rice: Roughly equivalent to the size of a grain of rice (3/16” to 5/16”), rice is the second smallest category by most classifications.Bituminous coal is characterized by a high sorption capacity with respect to unsaturated hydrocarbons, like propylene and acetylene. ... and oxygen content result in higher sorption capacity of coals. The reduction in grain size of coals also results in the increased sorption capacity with respect to hydrocarbons. The most significant increase in the volumes of …The ignition temperature for coal, which depends on several factors such as coal rank, volatile matter content and particle size, varies between 160 and 685 °C for most coals. Under adiabatic conditions, the minimum temperature at which a coal will self-heat is 35–140°C ( Smith and Lazarra, 1987 ).bituminous coals range from 10,720 to 14,730 Btu/lb. 3 The heating values of subbituminous coals range from 8,300 to 11,500 Btu/lb on a wet, ... categorized as PC-fired systems even though the coal is crushed to a maximum size of about 4-mesh. The coal is fed tangentially, with primary air, into a horizonal cylindrical furnace. Smaller coal ...This site uses cookies to improve your experience and to help show content that is more relevant to your interests. By using this site, you agree to the use of cookies by Flickr and our partners as described in our cookie policy.A. Grain Size : fine- , medium- , coarse-grained - these modifiers are useful for all metamorphic rocks except slates and phyllites, where a fine grain size is implied by the name. Size are for fine-grained < 0.75 mm , for medium grained 0.75-1 mm , and for coarse-grained 1-2 mm and very coarse-grained > 2 mm . A Wyodak subbituminous coal and an Illinois bituminous coal have been studied as precursors. The ground coals (−850 μm) were reacted with 50% strength H 3 PO 4 (4:1 ratio of acid solution to as-received coal) in two temperature stages. For the subbituminous coal, the first stage involved refluxing the coal-acid mixture for 60 min, following ...Sep 19, 2023 · Grain size for bituminous coal? small. What is the shape of rice grain? the same shape as a poo. What are 3 characteristics of a rocks grain? 1.Grain Size 2.Grain Shape 3.Grain Pattern. Bituminous coal is called black coal and is not as hard as Anthracite coal. It contains deposits of bitumen that is a tar like substance so this makes it softer. This coal comes …Bituminous Coal - local large concentrations of plant matter which has been buried. Lithification - is the process whereby a newly deposited unconsolidated sediment is slowly converted to sedimentary rock. Diagenesis - all chemical, physical, and biological changes that affect sediment after its initial deposition. Class F fly ash is pozzolanic brought out from either anthracite or bituminous burning of coal. The total amount of SiO2, Al 2 O 3, and Fe 2 O 3 must be greater than 70%. Class C ashes are pozzolanic, and cementitious produced from sub-bituminous or lignite coal burning..
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