Geochemistry of Kasnau-Matasukh lignites, Nagaur Basin, Rajasthan (India)

Abstract

The distribution and verticals variation of geochemical components in the Kasnau-Matasukh lignites of Nagaur Basin, Rajasthan, were investigated using microscopy, proximate and ultimate analyses, Rock-Eval Pyrolysis, X-ray diffraction and Fourier Transform Infrared analyses, and major/minor/trace element determination. The relationship of elements with ash content and with macerals have also been discussed. These lignites are stratified, black, dominantly composed of huminite group macerals with subordinated amounts of liptinite and inertinite groups. They are classified as type-III kerogen and are mainly gas prone in nature. The concentration (in vol%) of mineral matter is seen to increase towards upper part of seam and so is the concentration (in wt%) of the volatile matter, elemental carbon and sulphur. The common minerals present in these lignitesare mixed clay layer, chlorite, and quartz as identified by X-ray diffraction study. Compared with world average in brown coal, the bulk concentration of Cu is anomalously high in most of the samples while Cd is 2-3 times high and Zn is high in one band. Based on interrelationship, different pyrite forms are noticed to have different preferential enrichment of various elements. The concentration of disseminated pyrite is more than the other pyrite forms and is followed by discrete pyrite grains and massive pyrite.

Occurrence mode of selected elements of coal in the Ordos Basin

“…The main minerals in the ‘high-aluminium coal’ are kaolinite, boehmite, pyrite, quartz and calcite (Sun et al., 2012b). The clay minerals, in general, occur as disseminated fine particles, lens-shaped, thin-layered and massive forms in collodetrinite or as cell-fillings in fusinite of syngenetic origin (Naik et al., 2016; Prachiti et al., 2011; Singh et al., 2016b, 2015a, 2015b; 2012; Singh and Singh, 1995). Boehmite is recorded in all the studied mines and is the second most dominant mineral.…”

Biosynthesis of Food Flavours and Fragrances - A Review

“…Lipase catalyzed production of flavour esters by esterification reactions is influenced by a number of esterification factors like molarity of alcohol, addition of water, agitation speed, temperature and amount of immobilized enzyme [22].…”

“…Based on the preference of the customers towards natural flavours, biosynthesis of the flavour esters, namely octyl acetate and methyl butyrate were done through immobilized lipase mediated esterification under solvent-free conditions [22].…”

Physico-chemical and elemental investigation of aqueous leaching of high sulfur coal and mine overburden from Ledo coalfield of Northeast India

“…Thus, the AMD (pH 2.0-3.0) (Baruah et al 2006;Dowarah et al 2009) has a strong leaching potential for releasing a large number of potentially PHE's into the aquatic environment. In addition to the AMD formation, under different atmospheric conditions, pyrite (FeS 2 ) in coal is often found in association with the hazardous elements such as As, Cd, Cu, Co, Pb, Hg, and Zn (Monterroso and Macias 1998;Singh et al 2016). The formation of elemental sulfur takes place during depyritization of coal by leaching of coal wastes (Schippers et al 1996).…”