沁水煤田15号煤中氟的赋存状态及其沉积环境分析

Analysis of Coal No.15 Fluorine Hosting State and Sedimentary Environment in Qinshui Coalfield

氟是煤中有害元素之一,燃煤型氟排放造成的污染已经对人类的健康安全构成威胁。研究煤中氟赋存状态及其沉积环境,对掌握高氟煤分布规律及控制燃煤造成的氟排放具有重要意义。通过对沁水煤田内6座煤矿15号煤样品的分析发现:煤中氟含量与灰分显著相关,与黄铁矿硫、有机硫无相关关系,表明煤中氟主要以无机物形式赋存,且与含硫矿物无关;与钾、镁、硅、铝等元素含量具有显著的相关关系,表明氟有可能的主要赋存形式为金云母、氟金云母等矿物,以及以吸附存在于高岭石、勃姆石、伊蒙混层等黏土矿物中;与钙、磷元素含量无显著相关性,表明氟不以氟磷灰石、含氟羟基磷灰石等矿物大量赋存。此外,通过对沁水煤田15号煤的沉积环境分析发现,弱还原环境、较低盐度、偏酸性、较强的水动力条件有利于该区域煤中氟的富集。

Fluorine is one of harmful elements in coal.Coal combustion fluorine discharge pollution has constituted threat on human health safety.Study on coal fluorine hosting state and its sedimentary environment has significance to grasp high fluorine coal distribution pattern and control coal combustion caused fluorine discharge.The paper through analysis of coal No.15 samples from 6 coalmines in the Qinshui coalfield has found that coal fluorine content is notably correlated with ash content,while without correlation with pyritic sulfur and organic sulfur indicated coal fluorine mainly hosted in inorganic matter form,without correlation with sulfurous minerals;obviously correlated with potassium,magnesium,silicon and aluminum etc content indicated possible main hosting state is phlogopite,fluorophlogopite etc minerals,as well as with adsorptive state in kaolinite,boehmite,illite/smectite mixed-layer etc clay minerals;without obvious correlation with calcium,phosphorus content indicated fluorine not largely hosted in fluorapatite,fluorinated hydroxyapatite etc minerals.Besides,through analysis of coal No.15 sedimentary environment in Qinshui Basin has found that weak reduction environment,rather low salinity,slightly acidic and rather strong hydrodynamic condition are propitious to coal fluorine enrichment in the area.