岩浆岩侵入对煤质的影响

山东省石炭二叠纪煤田为全国较典型的岩浆岩侵入影响严重的区域之一。通过收集G矿区实际生产和勘查资料,对已揭露的岩浆岩侵入区的煤层变质特点进行分析,结果表明:由于岩浆的侵入和热液的影响,各煤层均在深成变质作用的基础上不同程度地迭加了接触变质作用,煤的变质程度均有不同程度的增高,由低变质阶段的气煤变质为中、高变质阶段的气肥煤、肥煤、焦煤、瘦煤、贫煤、无烟煤,甚至变为具有气孔及结晶质结构、坚硬、性脆、无光泽或暗淡光泽的天然焦。由于岩浆岩影响致使煤的物理、化学性质及工艺性能均不同程度地发生了一系列变化,山西组煤多数为低硫煤,太原组煤为高硫煤,天然焦为特低硫;山西组煤、太原组煤为高发热量煤,具有较好的黏结性,天然焦为中高发热量,不具黏结性。总结煤层受岩浆岩侵入后的变质情况为今后资源利用提供理论依据。

Influence of magmatic rock intrusion on coal quality

Carboniferous Permian coal in Shandong Province is one of the typical areas which are seriously affected by magmatic rock intrusion. Through collecting the G mine actual production and exploration data, investigate the degree of coal metamorphism of magmatic rock intrusion area. The results show that, influenced by magmatic rock intrusion and hydrotherm, each coal seam superimposes the contact metamorphism on the basis of plutonic metamorphism. The coal rank of each seam all rise to a certain extent. Low rank coal can become medium-high rank coal, such as gas-fat coal, fat coal, coking coal, lean coal, meager coal and anthracite, even natural coke with pore and crystal structure which is hard, brittle, lustreless or pale. Due to the magmatic rock intrusion, the physical, chemical and process properties of coal have changed in different degrees. Most of Shanxi Formation is low-sulfur coal, Taiyuan Formation is high-sulfur coal, both are high calorific value coal and have better caking property. The natural coke is ultra-low sulfur coal, which is medium-high calorific value and don＇t have caking property. Sum up the degree of coal metamorphism of magmatic rock intrusion area and the analysis provides theoretical reference for resources utilization.