The properties of Çan Basin coals (Çanakkale—Turkey): Spontaneous combustion and combustion by-products

Abstract The goals of this study were to investigate the susceptibility of Can Basin (Canakkale—Turkey) coals to spontaneous combustion and to determine the composition of the gas produced from the coal during combustion. Coal properties were determined using burned and partly burned coal samples; gas samples were analyzed for their composition. The mineralogical variations of burning coals were also investigated. Our results indicated that the pyrite content of Can Basin coals is a significant factor for promoting combustion in addition to rank and moisture. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses indicated that the coal samples contained pyrite, quartz, cristobalite, tridymite, kaolinite, amorphous matter, and gypsum. Fumarolic minerals (sulfur blooming and ammonium chloride) forming on the surface of coal seams were monitored. Elements including beryllium, fluorine, scandium, vanadium, cobalt, nickel, copper, zinc, arsenic, selenium, zirconium, molybdenum, tungsten, mercury, tantalum, lead, and uranium were found to be higher in Can coal samples than the world average. The concentration of arsenic (max. 3319.7 μg/g) was relatively high and is the major hazardous element in the region. Gases emitted from coal-fire vents in Can coalfields were found to consist of a complex mixture of hydrocarbons, greenhouse gases, and toxic concentrations of carbon monoxide (CO), hydrogen sulfide (H2S), and benzene. Hydrocarbon concentrations ranged from 77 to 92%, and the dominant hydrocarbon gas was methane. Ethane (0.3 to 2.1%) and propane (0.2 to 1.4%) were also detected. Hazardous compounds such as 5-methyl-3-propyl-1,2-oxazole (C7H11NO), ethanediimidic acid, 1,2-dihydrazide (C2H8N6), and 2,3-dihydrofuran (C4H6O); high concentrations of nitrogen (N2) (max. 6.8%) and carbon dioxide (CO2) (max. 18.2%); and low concentrations of carbon monoxide were also determined. Greenhouse gases (CO2 and methane (CH4)) from burning coal beds may contribute to climate change and alter ecosystems. Gas components including furan, H2S, CO, carbon disulfide (CS2), benzene etc., can be hazardous to human health, even in trace amounts. As a result, the uncontrolled release of pollutants from burning coal beds presents potential environmental and human health hazards.

[1]  Maria Izquierdo,et al.  Influence of soil cover on reducing the environmental impact of spontaneous coal combustion in coal waste gobs: A review and new experimental data , 2011 .

[2]  G. Gürdal.  Geochemistry of trace elements in Çan coal (Miocene), Çanakkale, Turkey , 2008 .

[3]  James C. Hower,et al.  Quantifying greenhouse gas emissions from coal fires using airborne and ground-based methods , 2011 .

[4]  Yang Li,et al.  Trace element emissions from spontaneous combustion of gob piles in coal mines, Shanxi, China , 2008 .

[5]  Robert B. Finkelman,et al.  MODES OF OCCURRENCE OF ENVIRONMENTALLY· SENSITIVE TRACE ELEMENTS IN COAL , 1995 .

[6]  James C. Hower,et al.  The Tiptop coal-mine fire, Kentucky: Preliminary investigation of the measurement of mercury and other hazardous gases from coal-fire gas vents , 2009 .

[7]  B. Cardott,et al.  Classification of huminite—ICCP System 1994 , 2005 .

[8]  H. Chung,et al.  Origin of gaseous hydrocarbons in subsurface environments: Theoretical considerations of carbon isotope distribution , 1988 .

[9]  David J. Williams,et al.  Greenhouse gas emissions from low-temperature oxidation and spontaneous combustion at open-cut coal mines in Australia , 2009 .

[10]  S. R. Michalski,et al.  Fires in Abandoned Coal Mines , 1990 .

[11]  C. Ward,et al.  Quantitative chemical profiling of coal using core-scanning X-ray fluorescence techniques , 2014 .

[12]  Magdalena Misz-Kennan,et al.  Application of organic petrology and geochemistry to coal waste studies , 2011 .

[13]  M. Mastalerz,et al.  Spontaneous Combustion and Coal Petrology , 2010 .

[14]  R. Finkelman,et al.  The types of data needed for assessing the environmental and human health impacts of coal , 1999 .

[15]  E. Stach,et al.  Stach's Textbook of coal petrology , 1975 .

[16]  James C. Hower,et al.  Direct estimation of diffuse gaseous emissions from coal fires: Current methods and future directions , 2013 .

[17]  D. Blake,et al.  Gaseous compounds and efflorescences generated in self-heating coal-waste dumps — A case study from the Upper and Lower Silesian Coal Basins (Poland) , 2013 .

[18]  Eliseo Monfort,et al.  Environmental characterization of burnt coal gangue banks at Yangquan, Shanxi Province, China , 2008 .

[19]  J. Hoefs.  Stable Isotope Geochemistry , 1973 .

[20]  G. Gürdal.  Abundances and modes of occurrence of trace elements in the Çan coals (Miocene), Çanakkale-Turkey , 2011 .

[21]  Rekha Ghosh.  Spontaneous combustion of certain Indian coals—some physico-chemical considerations , 1986 .

[22]  Robert B. Finkelman,et al.  Potential health impacts of burning coal beds and waste banks , 2004 .

[23]  Vedat Didari,et al.  Relations between Coal Properties and Spontaneous Combustion Parameters , 2002 .

[24]  J. Hower,et al.  Chemical and mineralogical compositions of silicic, mafic, and alkali tonsteins in the late Permian coals from the Songzao Coalfield, Chongqing, Southwest China , 2011 .

[25]  X. Querol,et al.  Environmental impact of mineral transformations undergone during coal combustion , 1991 .

[26]  Wang Jun,et al.  Assessment of the contribution of in-situ combustion of coal to greenhouse gas emission; based on a comparison of Chinese mining information to previous remote sensing estimates , 2011 .

[27]  C. Ward,et al.  Mineral matter and trace elements in coals of the Gunnedah Basin, New South Wales, Australia , 1999 .

[28]  F. G. Bell,et al.  Environmental impacts associated with an abandoned mine in the Witbank Coalfield, South Africa , 2001 .

[29]  M. Bozcu,et al.  Petrographic characteristics and depositional environment of Miocene Çan coals, Çanakkale-Turkey , 2011 .

[30]  John C. Crelling,et al.  Applied coal petrology : the role of petrology in coal utilization , 2008 .

[31]  Joana Ribeiro,et al.  Burning of coal waste piles from Douro Coalfield (Portugal): Petrological, geochemical and mineralogical characterization , 2010 .

[32]  J. C. Taylor,et al.  Quantification of mineral matter in the Argonne Premium Coals using interactive Rietveld-based X-ray diffraction , 2001 .

[33]  W. H. Mathews,et al.  In situ gasification of coal, a natural example: history, petrology, and mechanics of combustion , 1982 .

[34]  John Carras,et al.  Self-heating of coal and related materials: Models, application and test methods , 1994 .

[35]  James C Hower,et al.  CO(2), CO, and Hg emissions from the Truman Shepherd and Ruth Mullins coal fires, eastern Kentucky, USA. , 2010, The Science of the total environment.

[36]  M. P. Ketris,et al.  Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals , 2009 .

[37]  Robert B. Finkelman,et al.  Geochemistry of trace elements in Chinese coals: A review of abundances, genetic types, impacts on human health, and industrial utilization , 2012 .

[38]  F. Orr,et al.  Comparison of methods to estimate the rate of CO2 emissions and coal consumption from a coal fire near Durango, CO , 2011 .

[39]  James C. Hower,et al.  Gaseous emissions and sublimates from the Truman Shepherd coal fire, Floyd County, Kentucky: A re-investigation following attempted mitigation of the fire , 2012 .

[40]  D. Blake,et al.  Old Smokey coal fire, Floyd County, Kentucky: Estimates of gaseous emission rates , 2011 .

[41]  Glenn B. Stracher,et al.  Coal fires burning out of control around the world : Thermodynamic recipe for environmental catastrophe , 2004 .

[42]  Wolfgang Wagner,et al.  Uncontrolled coal fires and their environmental impacts : investigating two arid mining regions in North - Central China , 2007 .

[43]  R. G. Wiese,et al.  Spontaneous formation of hydrated iron sulfates on laboratory samples of pyrite- and marcasite-bearing coals , 1987 .

[44]  C. Ward,et al.  Mineralogical and geochemical compositions of the Pennsylvanian coal in the Adaohai Mine, Daqingshan Coalfield, Inner Mongolia, China: Modes of occurrence and origin of diaspore, gorceixite, and ammonian illite , 2012 .

[45]  L. Sloss,et al.  Trace elements : emissions from coal combustion and gasification , 1992 .

[46]  C. Ward,et al.  Mineralogical Transformations in Coal Feedstocks during Carbon Conversion Based on Packed-Bed Combustor Tests: Part 1. Bulk Coal and Ash Studies , 2012 .

[47]  J. Hower,et al.  Nanominerals and ultrafine particles in sublimates from the Ruth Mullins coal fire, Perry County, Eastern Kentucky, USA , 2011 .

[48]  N. Calos,et al.  Behaviour of selected minerals in an improved ash fusion test : quartz, potassium feldspar, sodium feldspar, kaolinite, illite, calcite, dolomite, siderite, pyrite and apatite , 1999 .

[49]  Allan Kolker,et al.  Gas emissions, minerals, and tars associated with three coal fires, Powder River Basin, USA. , 2012, The Science of the total environment.

[50]  R. Bustin,et al.  Reflectance and petrology profile of a partially combusted and coked bituminous coal seam from British Columbia , 1988 .

[51]  J. F. Cudmore.  Spontaneous combustion of coal and mine fires: by S.C. Banerjee (Editor), A.A. Balkema, Rotterdam, The Netherlands, 1985, xii + 168 pp., Dfl. 68,25 (hardback) , 1988 .

[52]  S. Vassilev,et al.  Occurrence, abundance and origin of minerals in coals and coal ashes , 1996 .

[53]  Chunli Liu,et al.  Management of Spontaneous Combustion in Coal Mine Waste Tips in China , 1998 .

[54]  S. Dai,et al.  Determination of As and Se in coal and coal combustion products using closed vessel microwave digestion and collision/reaction cell technology (CCT) of inductively coupled plasma mass spectrometry (ICP-MS) , 2014 .

[55]  Harold J. Annegarn,et al.  The spontaneous combustion of coal and its by-products in the Witbank and Sasolburg coalfields of South Africa , 2007 .

[56]  B. K. Misra,et al.  Susceptibility to spontaneous combustion of Indian coals and lignites: an organic petrographic autopsy , 1994 .

[57]  J. Brooks,et al.  Light hydrocarbons in recent Texas continental shelf and slope sediments , 1978 .

[58]  W. Schröter,et al.  Chemie : Fakten und Gesetze , 1982 .

[59]  Y. Prasad,et al.  Effect of coalification on spontaneous combustion of coals , 1990 .

[60]  O. Shevchenko,et al.  On pollution of the biosphere in industrial areas: the example of the Donets coal Basin , 1999 .

[61]  Shifeng Dai,et al.  Concentration and distribution of elements in Late Permian coals from western Guizhou Province, China , 2005 .

[62]  Bogdan Z. Dlugogorski,et al.  Coal oxidation at low temperatures: oxygen consumption, oxidation products, reaction mechanism and kinetic modelling , 2003 .

[63]  J. Hower,et al.  Composition and modes of occurrence of minerals and elements in coal combustion products derived from high-Ge coals , 2014 .

[64]  E. Carranza,et al.  Arsenic geochemistry and health. , 2005, Environment international.

[65]  G. Rein,et al.  Chapter 6 - Infrared Image Analysis as a Tool for Studying the Horizontal Smoldering Propagation of Laboratory Peat Fires , 2015 .