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

Xie Tao,Zhang Guangchao and Qiao Junwei(Geological Exploration Institute,Aerial Photogrammetry and Remote Sensing Bureau,CNACG,Xian,Shaanxi 710054)  
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.
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