陕北及黄陇侏罗纪煤田煤中硫分、灰分成因探讨

A Genetic Discussion on Coal Sulfur and Ash in Jurassic North Shaanxi and Huanglong Coalfields

以地质勘查资料、煤质分析结果为依据,对陕北及黄陇侏罗纪煤田延安组煤中硫分、灰分组成特征及成因进行探讨。研究结果表明:陕北、黄陇侏罗纪延安组煤中硫分含量较低,前者为特低-低硫,以有机硫为主,后者为中-低硫,以硫化铁硫为主;煤灰成分组成相似,但后者灰分产率高于前者;由于陕北、黄陇煤田延安组成煤环境不同,受陆源碎屑物质的供给的影响,使黄陇煤田延安组煤中全硫含量及灰分产率均高于陕北煤田延安组煤。

Based on geological exploration data and coal quality analyzed results,discussed composing features and genesis of coal sulfur and ash in the Yanan Formation coal in the North Shaanxi and Huanglong coalfields.The result has demonstrated that: the sulfur content is rather low in both coalfields,but in North Shaanxi coalfield is from extra low to low,mainly organic sulfur,while in Huanglong coalfield is from medium to low,mainly pyritic sulfur;the composition of coal ash in both coalfields is similar,but ash yield in the former is higher than in the later.Since the different coal-forming environments in both coalfields,and impacts from terrigenous clastic supply,the total sulfur content and ash yield are all higher in Huanglong coalfield Yanan Formation coal than in North Shaanxi coalfield Yanan Formation coal.