We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Sequential solvent extraction for the modes of occurrence ofselenium in coals of different ranks from the Huaibei Coalfield,China.
- Authors
Ying Zhang; Guijian Liu; Chen-Lin Chou; Lei Wang; Yu Kang
- Abstract
Forms of selenium in bituminous coal, anthracite, and cokeite (natural coke) from Huaibei Coalfield, Anhui, China, have been determined by sequential solvent extraction. The selenium content in bulk samples is 4.0, 2.4, and 2.0 µg/g in bituminous coal, anthracite, and cokeite, respectively. The six forms of selenium determined by six-step solvent extraction are water-leachable, ion-exchangeable, organic matter-associated, carbonate-associated, silicate-associated, and sulfide-associated. The predominant forms of selenium in bituminous coal are organic matter-associated (39.0%), sulfide-associated (21.1%), and silicate bound (31.8%); these three forms account for 92% of the total. The organic matter bound-selenium decrease dramatically from bituminous coal (39.0%) to anthracite (11.6%) and to cokeite (0%), indicating that organic matter bound selenium is converted to other forms during metamorphism of the coal, most likely sulfide-form. The sulfide-associated form increased remarkably from bituminous coal (21.1%) to anthracite (50.4%) and cokeite (54.5%), indicating the formation of selenium sulfide, possibly in pyrite during the transformation of bituminous coal to anthracite and cokeite. The silicate-associated selenium in bituminous coal (31.8%) is much higher than that in anthracite (16.4%) and cokeite (15.8%), indicating that silicate-associated selenium is partly converted to sulfide during metamorphism.
- Subjects
ANHUI Sheng (China); CHINA; COAL; HYLOMORPHISM; SOLVENTS; ANTHRACITE coal; HUAIBEI Coalfield Group (Company)
- Publication
Geochemical Transactions, 2007, Vol 8, p14
- ISSN
1467-4866
- Publication type
Article
- DOI
10.1186/1467-4866-8-14