煤的族组分形成机理研究

STUDY ON FORMATION MECHANISM IN COAL GROUP COMPONENT

采用CS2/NMP混合溶剂和反萃取剂,将徐州夹河煤在常温常压下分离为萃余煤组分、沥青质组分、精煤组分和轻质组分四大族组分,通过扫描电镜(SEM)对混合溶剂萃取、反萃取过程进行了追踪研究,主要探讨了族组分中精煤组分和沥青质组分形成的微观机理.结果表明,精煤组分和沥青质组分均是以微纳米颗粒形式从煤大分子基质悬浮到萃取液中,两种颗粒在后续反萃取过程中均发生融并现象.以深灰色呈现的精煤组分颗粒在加入反萃取剂后,融并为网孔状或表层均一的块体;以灰白色(或亮白色)呈现的沥青质组分颗粒在加入反萃取剂前后由分散聚集变为高度聚集,进一步融并成表面极为光滑均一的块体,最后经历了合并和长大的过程,于少量NMP中重新分散成大小均匀的小球体.

ABSTRACT Xuzhou Jiahe coal was all separated into four group components including resi- due, asphaltene component, ultra-pure coal and light component at room temperature and pres- sure with CS2/NMP mixed solvent and strippant. The process of extraction and stripping was tracked by SEM to study ultra-pure coal and asphaltene component formation mechanism in mi- croscopic. The results show that ultra-pure coal and asphaltene component that belong to micro- nano particle give priority to the floating mode from coal macromolecule matrix to extract liquid. Both ultra-pure coal and asphaltene particle occurred fusion phenomenon during the process of stripping. Dark gray ultra-pure coal melt into mesh or surface uniformity block after adding strip- ping reagent. Offwhite（or white） asphaltene component change from the scatter-gather into a high degree aggregation before and after joining stripping reagent and melt into extremely smooth and uniform surface block in further. After the process of merging and growing up, it redispersed into a small sphere of uniform size in NMP reagent at last. KEY WORDS extraction, group components, formation mechanism