Search results
Results from the WOW.Com Content Network
Lignite mining, western North Dakota, US (c. 1945). Lignite is brownish-black in color and has a carbon content of 60–70 percent on a dry ash-free basis. However, its inherent moisture content is sometimes as high as 75 percent [1] and its ash content ranges from 6–19 percent, compared with 6–12 percent for bituminous coal. [5]
In the ASTM system, any coal with more than 69% fixed carbon is classified by its content of carbon and volatiles. Coal with less than 69% fixed carbon is classified by its heating value. Volatiles and carbon are on a dry mineral free base; heating value is based on the moisture content as mined, but without any free water.
Peat has a high carbon content and can burn under low moisture conditions. Once ignited by the presence of a heat source (e.g., a wildfire penetrating the subsurface), it smoulders. These smouldering fires can burn undetected for very long periods of time (months, years, and even centuries) propagating in a creeping fashion through the ...
Chemical properties of the lignite found in the Visonta Coal Mine According to Kosma (2011) According to Stoll, Niemann-Delius, Drebenstedt, Müllensiefen (2008) According to Dovrtel (2003) East Pit II South Pit Entire mine (excluding East Pit III) Water content 49.5 % 46–50 % 50.4% Ash content 20.0% 16.0% 13–17 % 16–20 % Sulphur content
It is an oxidation product of lignite, associated with near-surface mining. [1] It is a rich source of humic acid (up to 90%) [2] and is used as a soil conditioner, as a stabilizer for ion-exchange resins in water treatment, [3] in the remediation of polluted environments and as a drilling additive. [4]
Lignite is mined in Victoria and South Australia, [14] and is of lower quality due to a lower thermal value largely caused by a high water content. [15] Ash content varies significantly but some Australian lignites have relatively low ash content. [16] In 2013 coal from three open cut lignite coal mines in Victoria was used for power generation ...
Organic-rich sedimentary rocks are a specific type of sedimentary rock that contains significant amounts (>3%) of organic carbon. [1] [2] The most common types include coal, lignite, oil shale, or black shale. [2]
Coal rank is based on several characteristics of the coal. The fixed carbon content refers to the percentage of the coal that is neither moisture, nor ash, nor volatile matter. When evaluated on a dry, mineral-matter-free basis, the fixed carbon content is the fraction of the coal that is not volatile organic matter. [4]