Experimental research on the spontaneous combustion of ...
The detection shows that the inorganic sulfur content of the H 0 high-sulfur coal accounts for 93% of the total sulfur content, and the low-sulfur coal sample L 0 …
[Determination of the content of sulfur of coal by the ...
The sulfur content results and their standard deviations of an anthracite coal and a bituminous coal with a low sulfur content determined by this modified method were 0.345% (0.004%) and 0.372% (0.008%), respectively. The uncertainty (U, k =2) of sulfur contents of two coal samples was evaluated to be 0.019% and 0.021%, respectively.
The Distribution and Isotopic Composition of Sulfur in …
Individual coal samples were classified as high or low sulfur based on organic sulfur content. High sulfur coals (>0.8% organic sulfur by dry weight) exhibited a wide range of • values for organic sulfur (--8 to +15%o), whereas low sulfur coals showed a narrow
Standard Test Methods for Total Sulfur in the Analysis ...
certified sulfur content of 6 0.0xx precision can be used. Sulfur values obtained by analyzing these coals, using any of the methods described in this test method, may be used for checking the accuracy of analytical results. 1 These test methods are under the jurisdiction ofASTM Committee D05 on Coal
(PDF) Sulphur in coal - researchgate.net
The sulfur content in coal ranges from 0.5 to 5%, and it is an impurity that must be removed before burning coal, due to the toxic effects and acid rain caused by …
U.S. Coal Reserves: An Update by Heat and Sulfur Content
Sulfur content values of coal are considered low, medium, or high in relation to the potential of the coal, when burned, to produce sulfur dioxide emissions below, near, or above increments allowed by the U.S. Environmental Protection Agency under the Clean Air Act, New
Sulfur Forms, Coal Analysis, Kentucky Geological Survey ...
The testing procedures and guidelines for determining the weight percent contributions of these forms of sulfur to the total sulfur content of a coal are outlined in ASTM method D2492-02 (American Society for Testing and …
Organic and inorganic sulfur in coal (Journal Article ...
The organic sulfur content of the No. 5 coal and one of the No. 6 coals was in the range of 0.2 to 0.6%, while the other No. 6 coal had organic sulfur above 1% and total sulfur of 3.84%. The organic sulfur was easily distinguished from the pyritic or sulphatic sulfur forms by the local iron content and the variation in the sample current.
Sulfur in coals: A review of geochemistry and origins ...
Highlights Sulfur abundance in coals is controlled primarily by depositional environments. Sulfur isotopic evidence indicates a seawater source for sulfur in high-sulfur coal. Formation of pyrite and organic sulfur compounds during diagenesis. A high-sulfur, iron-poor environment for the superhigh-organic-sulfur coal.
Chapter 7 COAL - Pennsylvania State University
contains, the easier it is to start to burn it, or to achieve its ignition. Sulfur content of coals is seen to be quite variable. Because of the special importance of sulfur, related to the environmental consequences of burning coals, we shall discuss the presence of sulfur in coal in some detail (see below).
Decreasing the ash coal and sulfur contents of sawahlunto ...
In Sample 4, Coal + 15ml of oil, where sample weight was 0.2500 grams generated sulfur content of 0.609%. In Sample 5, Coal + 20 ml of "minyak jelantah" (used cooking oil), where the sample weight was 0.2500 grams generated a sulfur content of 0.428% and also a decrease in the value of the ash content.
Sulfur isotopes in coal constrain the evolution of ... - PNAS
Sulfate is the second most abundant anion (behind chloride) in modern seawater, and its cycling is intimately coupled to the cycling of organic matter and oxygen at the Earth's surface. For example, the reduction of sulfide by microbes oxidizes vast amounts of organic carbon and the subsequent reaction of sulfide with iron produces pyrite whose burial in sediments is an …
Comparison of structural characteristics of high-organic ...
High-organic-sulfur coal has unique structural characteristics due to its high organic sulfur content. To study the influence of organic sulfur in coal on the molecular structure of coal, a series of high-organic-sulfur coals and low-organic-sulfur coals of different coal ranks were selected, and their structural parameters were compared and analyzed through FTIR and …
Sulfur Coal - an overview | ScienceDirect Topics
The total sulfur content of the high organic sulfur coals ranges from 3.7-4.1 wt.% with about 75% of the sulfur existing as organic sulfur (Table 2 ). The total sulfur content of the low organic sulfur coal was 1.2 wt.% and 60% of the sulfur was in organic form. The total sulfur contents of the ICDACs were between 0.85 to 2.6 wt.% ( Table 3 ).
USGS Bulletin 1823 - Determination of Forms of Sulfur in …
The organically bound sulfur concentration is calculated by subtracting the sum of the concentrations of monosulfide, sulfate sulfur, and pyritic sulfur from the total sulfur content. Coke and coal standards are used as control samples for …
Monitoring the sulfur content of coal | SpringerLink
Information regarding the sulfur content of the coal is required not only in metallurgy but also when burning coal as a fuel. The traditional method of determining the sulfur content of coal is unsuitable for large-scale monitoring of processes because it is laborious and not sufficiently reliable. Nuclear-physics methods are free of those problems. However, …
Effects of Additives on Coke Reactivity and Sulfur ...
coal has suitable caking properties, but the higher sulfur content also restricts its ratio in coal blends. To achieve a high blending ratio of high-sulfur coking coal, Shen et al.1 proposed to use abundant hydrogen-rich volatiles generated from high-volatile coal to regulate the sulfur transformation behavior during pyrolysis of high-sulfur ...
A Model of Coal Cleaning for Sulfur Emissions Reduction
coal characteristics to be predicted from information on coal origin, heating value, ash, and sulfur content. The models were developed by first "processing" each of the 710 coals in the U.S. Bureau of Mines (USBM) coal washability data base through a coal prepara-tion plant computer model which optimizes plant performance to
Measuring Sulfur Content of Coal Using EDXRF
Sulfur in Coal 2.1 Sulfur Content The total sulfur content of coal can vary within a single deposit as well as between deposits. As summarized in Table 1, the content for selected coalfields of major coal producing countries ranges between below …
Measuring Sulfur Content of Coal Using EDXRF
Measuring Sulfur Content of Coal Using EDXRF. Pyrite (Fe2S) is a key mineral present in most coal, which contains different amounts of sulfur based on how much iron and sulfur combined in the peat when it transformed into coal, …
1.1 Bituminous And Subbituminous Coal Combustion
coal are its relative volatile matter and sulfur content as well as its slagging and agglomerating characteristics. Subbituminous coals have higher moisture and volatile matter and lower sulfur content than bituminous coals and may be used as an alternative fuel in some boilers originally designed to
What are the types of coal? | U.S. Geological Survey
There are four major types (or "ranks") of coal. Rank refers to steps in a slow, natural process called "coalification," during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material. The four ranks …
The Types of Coal: Composition, Usage, and Energy Value
Coking vs. Steam: Coking coal, also known as metallurgical coal, has low sulfur and phosphorus content and can withstand high heat.Coking coal is …
Process for reducing the sulfur content of coal - SIMPSON ...
A sample of New Mexico fuschia coal containing 6.4% total sulfur was subjected to the grinding-extraction procedures of Example 1. The sulfur content of the extracted coal was 2.5%, virtually all of which was pyritic sulfur. The extracted coal was mixed with a stoiciometric quantity of aluminum chloride, based on the pyrite content of the coal.
Sulfur dioxide and coal - Global Energy Monitor
In the U.S., coal from eastern states including Ohio, Pennsylvania, and West ia has higher sulfur content, accounting for 3 to 10 percent of the coal's weight; coal from western states such as Wyoming, Montana, Utah, and Colorado can have sulfur contents that make up less than 1 percent of its weight.
Determination of sulfur content in coal and coke by high ...
High-frequency infrared carbon and sulfur analyzer measures carbon and sulfur in metal materials quickly and accurately. In recent years, with the continuous improvement of high-frequency infrared carbon and sulfur, its precision has been greatly improved, so that it has a better application in the low content and high content range.
DETERMINATION AND CHARACTERIZATION OF …
Coal sulphur content is considered low from 0 to 20000 mg kg-1 and high when it is beyond 20000 mg kg-1. This means that South African coal generally has low sulphur content as referred to by the results obtained in this work. Sulphur compounds were found in coal samples as sulphate, pyrite and organic forms.
energy content ash content. heavy metals
As to sulphur content, most Asian countries have a straight ban on the importation of thermal coal with a sulphur content in excess of 1.0%. Australian coal exports sulphur content generally range from 0.5-1.0%.6 Other than high sulphur Columbian thermal coal (which for geographical reasons doesn't materially supply the Asian market), most of