祁东煤矿煤质变化特征及主要影响因素分析

对祁东煤矿32、61、9三个煤层的煤质变化特征及其主要影响因素进行分析，结果表明：从32、61到9煤层，煤的挥发分明显减少，而粘结指数略有增加，煤质呈现有规律的变化，从气煤和气肥煤向1／3焦煤和肥煤方向转化。同时，9煤层出现挥发分急剧减少、粘结性完全丧失的热变煤。分析认为：祁东煤矿从32、61到9煤层，从无到有、从弱到强的岩浆侵入活动是形成煤质变化的主要原因，区域岩浆热变质作用导致了这三个煤层煤质的规律性变化，而接触变质作用导致了9煤层热变煤的形成。

Analysis of Coal Property Change in Qidong Coalmine and Its Mayor Controlling Factors

Coal property change of coalseams No. 32,61 and 9 in Qidong coalmine and its mayor controlling factors are studied. The results showed that： from coalseam No. 32,61to 9, volatile matter in coal obviously decreases while caking index slightly increases, coal property regularly changes from gas coal and gas-fat coal to 1/3 coke coal and fat coal. In coalseam No. 9 thermo-metamorphic coal occurrs with sharply decreased volatile matter and with no caking property. The research showed that： the magmatic intrusion in Qidong coalmine is intensified in degree and expanded in area from coalseam No. 32, 61to No. 9, which is the mayor reason of coal property change. The telemagmatic metamorphism cause the regu- lar change o（ coal property of the three coalseams, while the contact metamorphism results in formation of thermo-metamorphic coal in coalseam No.9.