北票县有丰富的煤矿资源,每年在洗煤时,拚弃的煤矸石达100多万吨,多以碳质页岩为主。根据试验分析,自燃段表层的煤矸细粒、粉末,含氮量都在0.31％以上,可供植物利用的水解性氮素占全氮量的1/3以上。至于未燃段,则含氮量低,目前缺乏利用价值。 Beipiao County is rich in coal resources. Every year when the coal is washed, more than 1 million tons of coal gangue are abandoned, mainly by carbonaceous shale. According to the experimental analysis, the content of coal gangue granules, powder and nitrogen in the spontaneous combustion section is above 0.31%, and the hydrolyzable nitrogen which can be used by plants accounts for more than 1/3 of the total nitrogen. As for unburned section, the nitrogen content is low, the current lack of value.