Grain size distribution of Işalnita power plant lignite ash and elemental composition of size classes

✍ Scribed by G Niac; Al Popescu; I Viaşu-Bolocan; P Capotã

• Book ID: 104135623
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 111 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(00)00129-0

✦ Synopsis

Grain size analysis of 48 samples of Is ,alni(a power plant lignite ash revealed a mixture of three populations, each of them showing best ®t to Weibull distribution with smallest size (x 0 ) 40, 350 and 740 mm, mean size (x m ) 163, 506 and 1068 mm, exponent (a ) 1.42, 2.31 and 0.84, and participation to the whole mass with (p) 49, 23 and 28%, respectively. The ®ne population originates, according to the ªtwo phase model of coalº, from the mineral, the coarse, from the maceral pseudo-phase, while the middle fraction is presumably formed from extraneous minerals. Other three samples taken from the same power plant twenty years later could be resolved alike in three populations, with x 0 and x m shifted to smaller sizes. Concentrations of Na and Ca are evenly distributed among size classes, concentrations of K, Mg, Al, Fe, Ti and P are decreasing with particle size, while the concentration of S and C increases from the smallest to the largest size class 5 and 10 times, respectively, due to the mainly organic origin of these elements.