指的是褐煤向烟煤、无烟煤转变的过程。煤在变质过程中，内部结构、化学组成、物理特征以及工艺性能都呈有规律的变化。
关于煤的变质因素，文中否定了那种把该煤田煤变质因素单纯归结了深成变质作用的观点。
The opinion is denied of the metamorphic factor only relying on to regional metamorphism in the paper.
探讨了煤的变质程度、粘结剂和成型条件对颗粒间作用力的影响。
The metamorphic degree of coal, the binder and the briquetting conditions that affect the acting forces were also studied.
在实验基础上进一步探讨了构造煤的动力变质作用和自由基浓度在煤和瓦斯突出预测中的作用。
The dynamic metamorphism of disturbed coals and the effect of radical density on coal gas outburst prediction are discussed.
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