Anomalies in Vicker's microhardness of subbituminous and high volatile bituminous coals

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

International Journal of Coal Geology Pub Date : 2024-11-19 DOI:10.1016/j.coal.2024.104659

Saeed Chehreh Chelgani , James C. Hower , Maria Mastalerz , Susan M. Rimmer

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Abstract

Vickers microhardness (MH) of coal is known to be strongly correlated with coal rank. To examine coal rank and other coal quality parameters, such as organic sulfur, that might influence MH, a suite of more than 300 samples from the Penn State Coal Quality database with vitrinite R_max < 1.1 % were examined. The data set was narrowed down to 296 coals with moisture (as-received basis) < 20 %. As MH is a parameter measured on vitrinite, vitrinite R_max was used as the rank parameter. The Eocene Big Dirty coal (Washington state) stood out as a high MH/high-moisture coal while Hanna and Green River basin coals (Wyoming) had low atomic H/C values and K Unita Basin (Utah) coals had high H/C. Organic S did not show a correlation with MH within discrete rank ranges. With respect to vitrinite R_max vs. MH, the Big Dirty coal and some Illinois and Iowa coals lie on the high-MH/low-R_max side and the Pennsylvanian Tioga (West Virginia) and the Indiana Brazil Formation coals, all dominated by dull lithotypes, lie on the low-MH/high-R_max side of the main data trend. Overall, the quadratic regression of vitrinite R_max vs. MH yields an R² of 0.55, indicating a significant correlation at the 95 % level.

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亚烟煤和高挥发性烟煤维氏硬度的异常现象

众所周知，煤的维氏硬度（MH）与煤的等级密切相关。为了研究可能影响 MH 的煤炭等级和其他煤炭质量参数（如有机硫），我们对宾夕法尼亚州立大学煤炭质量数据库中的 300 多个玻璃光泽度 Rmax < 1.1 % 的煤炭样本进行了研究。数据集的范围缩小到 296 块水分（以收货时为准）大于 20% 的煤炭。由于 MH 是根据玻璃光泽度测量的参数，因此使用玻璃光泽度 Rmax 作为等级参数。始新世的大脏煤（华盛顿州）属于高MH/高水分煤，而汉纳和绿河盆地煤（怀俄明州）的原子H/C值较低，K乌尼塔盆地煤（犹他州）的H/C值较高。在离散等级范围内，有机 S 与 MH 没有相关性。关于玻璃光泽 Rmax 与 MH 的关系，Big Dirty 煤以及伊利诺伊州和爱荷华州的一些煤炭位于高 MH/低 Rmax 一侧，而宾夕法尼亚 Tioga（西弗吉尼亚）和印第安纳州巴西地层煤炭（均以暗淡岩性为主）则位于主要数据趋势的低 MH/高 Rmax 一侧。总体而言，玻璃光泽度 Rmax 与 MH 的二次回归得出的 R2 为 0.55，表明在 95% 的水平上存在显著的相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Coal Geology 工程技术-地球科学综合

CiteScore

11.00

自引率

14.30%

发文量

145

审稿时长

38 days

期刊介绍： The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.