True density and elemental composition of subbituminous coals

✍ Scribed by Sat Parkash

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 390 KB
• Volume: 64
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(85)90046-8

✦ Synopsis

Multivariate correlation, indicating strong dependence of coal density on elemental composition, expressed on a dry, ash-free basis [pHe= 3.5742 -(0.0197C + 0.01920) -0.0691 H] is proposed for low-rank coals (C, 70.8-75.8 wt%; reflectance 0.24-0.48%), maceral concentrates and chars produced (550-700°C) from subbituminous coals. True densities calculated using the above expression account for 83% of the variance of the measured densities (by helium pycnometry) of low-rank coals and their maceral concentrates and chars and 75% for US coals of different ranks.