Abstract
In order to reduce the waste caused by the exploitation of 5# coal seam in the lower coal group of Dafeng mine. We systematically studied the coal quality change law by Surfer and CAD software to draw coal quality (moisture, ash, volatile matter, sulfur content and calorific value) contour map. The results show that moisture changes along the syncline axis was more obvious in general, ash, volatile content were the highest in the center, sulfur content gradually reduced from the beginning of the edge to the center, calorific value was the lowest in the center.
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