pyrite in uk coals its environmental significance

1.. IntroductionCoal production in the UK has declined from a peak of 264 million tonnes in 1913 to only 17.0 million tonnes in 2007.However, coal remains about a third of the nation's energy mix. Coal consumption was 62.7 million tonnes in 2007, most of which (84%) was used for electricity generation (Hetherington et al., 2008).The emissions from coal-fired power …

presence of moisture. A new moist coal adiabatic oven test has been developed that can measure the influence of these parameters on the low temperature self-heating of coal. Examples of the experience gained from using this test clearly show the effects of moisture and pyrite on coal self-heating leading to thermal runaway.

It discusses the formation of pyrite and pyrrhotite and the chemical reactions involved in their oxidation, the effects of the oxidation process and how its by-products can lead to both heave and/or the degradation of concrete. Examples are …

The Parkgate coal of Langsettian age in the Yorkshire-Nottinghamshire coalfield is typical of many coals in the UK in that it has a high sulphur (S) content. Detailed information on the distribution of the forms of S, both laterally and vertically through the seam, was known from previous investigations. In the present work, 38 interval samples from five measured sections …

Three forms of sulfur exist in coal: pyrite, sulfate and organic sulfur (Lu and Liu 1999). Pyrite plays a vital role in coal spontaneous combustion. The specific heat of pyrite is only one-third of that of coal; but with the same heat absorption, the temperature rise of pyrite is three times higher when compared to coal. Reactions of pyrite and

Finkelman RB (1999) Trace elements in coal: environmental and health significance. Biol Trace Elem Res 67:2–9. Article Google Scholar Huang WH, Sun L, Ma YY, Wan H, Tang XY, Du G, Wu W, Qin SL, Finkelman RB (2007) Distribution and geological feature of the Coal-Ge deposit of Shengli coalfield in Inner Mongolia of China.

Appalachian coals, 72% from Midwest coals, and 64% from western coals. Junk et al. [15] removed from 72% to 92% of the Mn from 4 coals and 39% from a fifth coal.

Pyrite or Iron Pyrite (FeS2) is a very common mineral that is present in many sedimentary rocks as framboidal crystals. Subject to certain conditions, pyrite is problematic in confined construction, such as under floor filling and bridge embankments. This is due to a chemical reaction that can cause pyritic backfill to swell.

Thallium is concentrated in pyrite in coals along with other environmentally sensitive elements, notably Hg. 2. Thallium is an element of environmental concern, present in coal at the level of trace elements and emitted to the atmosphere to different extents in gas phase or in breathable particles.

Pyrite in UK coals: its environmental significance D. Alan Spears, M. Rosa Martinez Tarazona* and S. Lee Department of Earth Sciences, University of Sheffield, Dainton Building, Brook Hill, Sheffield S3 7HF, UK * Institute National del Carbon (CSIC), Apartado 73, 33080 Oviedo, Spain (Received 28 June 1993) The geochemistry of pyrite formation in coals …

Sulfur in coal occurs in three forms: (1) organic, (2) inorganic, and (3) elemental. Inorganic sulfur occurs mostly in minerals such as pyrite (FeS2). An additional test of sulfur forms can be run to determine the relative amount of the three forms of sulfur in a coal that contribute to the total sulfur value determined by ultimate analysis.

Emergent surfaces in the Mississippian (Asbian to Brigantian) carbonate platform succession of North Wales record periods of plant colonization and peat formation that led ultimately to the local development of coals. Examination of bituminous coals on three emergent surfaces within Cefn Mawr Quarry reveals information on palaeoclimate that is not available from study of the …

to evaluate the environmental and health impacts of pyrite ash materials. Keywords: coal rejects, sulphuric acid production, nanomineral impacts, potentially hazardous elements. 1. INTRODUCTION Coal has been used in Brazil as solid fuel for thermoelectric generation for nearly 80 years (Pires and Querol, 2004).

3.3 Effect of pyrite content on the abrasiveness index of South African coals. Figure 2: The effect of pyrite content on the abrasiveness index (AI) values of South African coal. AI was measured at random pyrite content coal as it was done for quartz and the data is represented on the graph.

Sulfur is the most notorious environmental contaminant in coal and its emission dur-ing coal utilization is a principal cause of acid rain (Tripathi et al., 1991). Fine-grained pyrite (generally<10mm in size) in washed coal is not only the main carrier of sulfur but

Identifying Pyrite. Hand specimens of pyrite are usually easy to identify. The mineral always has a brass-yellow color, a metallic luster and a high specific gravity. It is harder than other yellow metallic minerals, and its streak is black, usually with a tinge of green. It often occurs in well-formed crystals in the shape of cubes, octahedrons, or pyritohedrons, which often have …

The Morrison government says it won't shut down coal or gas production as part of its plan to meet its net zero target, with its roadmap predicting fossil fuel exports would continue beyond 2050.

Introduction to the Meaning and Uses of Pyrite. Pyrite is often called "Fool's Gold," though there is nothing foolish about this mineral. Within its gleaming beauty is a stone of hidden fire, one that can be sparked to life by striking it against metal or stone.

Pyrite. 1. Introduction. The utilisation of coal releases trace elements into the environment. Concentrations are increased above the natural background levels in the atmosphere and hydrosphere, thus raising environmental concerns because of potential impacts on ecosystems. The distribution of trace elements within the coal provides an insight ...

Pyrite is common in coal and coal-bearing strata influenced by marine activity [11,54], whereas pyrite deposited in coals and/or host rocks under terrestrial environment conditions is typically considered to have formed from epithermal solutions [54,80,81,82,83,84].

Zhimin Xu. Ge Chen. Huiqing Yuan. On 22 May 2017, a groundwater inrush accident occurred in the gob area of coal floor at Dongyu Coal Mine in Qingxu County, Shanxi Province, China. The …

Access of sulphate into the coal swamp environment can be directly related to river channels, many of which are known to have been long-lived features. The pyrite is of concern because of S emissions, but in addition it is the location in the coal for Hg, Tl, Pb, As and Se, all of which are of major environmental concern.

The determination of trace elements in British coals using energy dispersive polarized XRF and element distributions by statistical analysis

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 …

Frog back from the dead helps fight plans for mine in Ecuador. Campaigners say if copper mine gets go-ahead in cloud forest, the longnose harlequin, once thought to be extinct, will be threatened ...

The coal seams of the Taiyuan Formation in the Wuda Coalfield were formed in a delta sedimentary system (Fig. 2) (Peng and Zhang 1995; Dai et al. 2002, 2003).The No. 9 coal was deposited in a tidal deltaic plain environment whereas the No. 13 coal seam formed on a fluvial deltaic plain (Peng and Zhang 1995).The sediment-source region for the Wuda Coalfield …

These coal seams are tectonized, and their thicknesses vary from 0.4 to 1.2 m. The main types of coals are high-ash, bituminous rank with coking properties ( Goodarzi et al. …

The coal ash, however, has higher Fe and Ca concentrations than the associated mudrocks and this is due to a higher content within the coal of diagenetic pyrite and carbonate. The recognition that the minerals are mainly responsible for the ash in bituminous coals was established by previous authors, including Pike et al. (1989) and Ward (1989) .

Despite the widespread distribution of pyrite-rich shales, little research on the mineralogy and environmental significance of secondary sulfate minerals in the mining area has been conducted so far. Considering the prevalence of secondary sulfate minerals in the Lanmuchang Hg-Tl mine, this study will focus on the geochemistry of these minerals ...

The Parkgate coal of Langsettian age in the Yorkshire–Nottinghamshire coalfield is typical of many coals in the UK in that it has a high sulphur (S) content. Detailed information on the distribution of the forms of S, both laterally and vertically through the seam, was known from previous investigations.

Pyrite in UK coals: its environmental significance. D. Spears, M. M. Tarazona, S. Lee; Environmental Science. 1994; Abstract The geochemistry of pyrite formation in coals is considered. Sulfate availability in pore-solutions has long …

Spears DA, Zheng Y (1999) Geochemistry and origin of elements in some UK coals. Int J Coal Geol 38:161–179. Article Google Scholar Spears DA, Manzanares-Papayanopoulos LI, Booth CA (1999) The distribution and origin of trace elements in a UK coal; the importance of pyrite. Fuel 78:1671–1677

1. The significance of minerals in coal. Coal may be the most complex geologic material. In addition to the organic matter, valued for its energy potential, all coals contain water, minerals, most, if not all, of the elements in the Periodic Table, …

Geochemical and Mineralogical Significance of Trace Metals in Benue Trough Coal, Nigeria. In the present study, sub-bituminous coals from Ribadu, Okaba, Okpara, Orukpa, Ogboyoga and Lignite from Asagba, all from Benue Trough, Nigeria were analyzed by energy dispersive x-ray fluorescence spectrophotometer (EDXRF).