Effects of drying upon lignite macro-pore structure

Androutsopoulos, GP; Linardos, ThJ

dc.contributor.author	Androutsopoulos, GP	en
dc.contributor.author	Linardos, ThJ	en
dc.date.accessioned	2014-03-01T01:38:56Z
dc.date.available	2014-03-01T01:38:56Z
dc.date.issued	1986	en
dc.identifier.issn	00325910	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/22481
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0005362471&partnerID=40&md5=fb9d2b841aa8d1eb5caa3f0152e0ea3d	en
dc.title	Effects of drying upon lignite macro-pore structure	en
heal.type	journalArticle	en
heal.publicationDate	1986	en
heal.abstract	The effect of drying upon the macro- and partly meso-pore structure of Greek lignite was investigated. Drying of lignite lumps (∼dp: +3 - 15 mm) placed on a fixed bed arrangement, was carried out under vacuum (∼0.2 Torr) in a constant-temperature (100 - 250 °C) environment, for varying drying times (5 - 180 min). Drying caused a considerable particle contraction (by ∼1/3 of its original size), a minor decrease in the macro- and partly meso-pore volume and a marked increase in the relevant surface area, particularly in the range of high weight losses (35 - 40%). Residual moisture contents ranged from ∼0% to 42%, specific pore volume fell in the range 0.20 - 0.25 cm3/g (dry sample), and specific surface area in the range 9 - 17 m2/g (dry sample). Pore volume and surface area frequency distributions, determined from mercury porosimetry (MP) measurements done on raw or partially dried samples, clearly indicate the formation of pores in the size range Dp: + 75 - 1500 Å at the expense of pores in the range Dp: +1500 - 104 Å. This observation might be the result of pore shrinkage and pore emptying due to the counteraction of particle contraction and moisture removal respectively. Mercury penetration - retraction hysteresis was evident in every MP run. Mercury entrapment drop (from 85% to 38%) varied with residual moisture content, an indication that drying favours the formation of a more regular and less complex physical pore structure. © 1986.	en
heal.journalName	Powder Technology	en
dc.identifier.volume	47	en
dc.identifier.issue	1	en
dc.identifier.spage	9	en
dc.identifier.epage	15	en