出露于地表或埋藏于浅部的煤层，风化作用后，其化学和物理性质都发生了极为明显的改变，这一部分煤层的煤称为风化煤。
n. danty
misc. decomposed coal
...日 毕业论文（设计）开题报告一、综述本课题国内外研究动态，说明选题的依据和意义1、国内外研究动态 风化煤（decomposed coal）是指暴露于地表或位于地表浅层的煤俗称露头煤。风化煤经过风化氧化已失去作动力燃料和炼焦煤的价值1 。
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Wherefore, adsorption equilibrium and dissolvability of fulvic acid in the process of abstract from weathered coal were studied in this paper.
为此本论文进行了黄腐酸从风化煤中溶出时的吸附平衡及溶解性的研究。
参考来源 - 黄腐酸从风化煤中溶出时的吸附平衡及溶解性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文研究由风化煤制取腐植酸钾的生产工艺。
This article deals with productive technology oi potassium humate with decomposed coal.
我国风化煤资源丰富，研究开发其工业利用大有可为。
Resources of weathered coals are rich in China, It will be very promising to study and develop the industrial utilization of weathered coals.
与风化煤共生的软质高岭土中高岭石结晶度最高，为高度有序类型；
It is the highest for the soft kaolin clay associated with weathered coals, which is well order;
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