The key reasons of lowing of cleaned ratio coal were bad coal quality and large increase in sludge.
经分析发现，煤质变差，煤泥量大幅度增加是影响精煤产率的关键。
The paper analyses the quality characteristic of cleaned coking coal and rich coal from Gujiao mining area and the impact on the quality of coke. Bring forward it's utilization ways.
通过煤质分析，结合小焦炉试验分析了古交矿区焦、肥精煤的煤质特性，在分析炼焦煤对焦炭质量的影响的基础上，提出了古交矿区焦、肥精煤的合理使用方向。
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