陈思涵,白向飞,方全国
CHEN Sihan,BAI Xiangfei,FANG Quanguo

• 1:煤炭科学技术研究院有限公司检测分院
• 2:煤炭资源高效开采与洁净利用国家重点实验室
• 3:煤炭科学技术研究院有限公司煤化工分院

摘要(Abstract)：

为全面了解煤氧化、风化乃至自燃的全过程,基于黄铁矿氧化作用机理,分析了黄铁矿对煤低温氧化的影响以及水分对煤、黄铁矿氧化的促进作用,论述了黄铁矿对煤体初始低温条件下氧化的促进作用。煤中黄铁矿与适量水分的协同作用有利于煤体蓄积热量,促进煤体的氧化;煤体受到机械破碎后,黄铁矿化学活性增强、吸附氧气量增大,促进其氧化发热,也对煤体低温缓慢氧化过程具有促进作用。对于长时间保存的特殊用途煤样,应从2方面延缓煤体低温氧化反应:关注量值受氧化作用较大的煤样应寻找黄铁矿含量较低的样品;关注全硫和黄铁矿含量的煤样应充分考虑煤样的适宜保存水分或最高保存水分。煤样若需长期保存,需注意环境湿度变化和气流影响,尽量保持静风状态。
Pyrite more or less exists in coal,and it plays an important role in initial oxidation of coal due to its easy oxidation.In order to fully understand the process of coal oxidation,weathering and even spontaneous combustion,the mechanism of pyrite on coal initial oxidation need to be investigated deeply.Accordingly,the mechanism of pyrite oxidation was firstly studied in this paper,and the influence of pyrite on coal oxidation,the promoting effect of moisture on coal and pyrite oxidation and the facilitating role of pyrite on coal initial oxidation at low temperature was also discussed.It is showed that there is a synergistic effect between the appropriate moisture and pyrite in coal,which can accumulate heat in coal,causing the promotion of coal oxidation.In addition,the chemical activity of pyrite and the amount of oxygen adsorbed in coal are increased after the coal crushed by machine,thus promoting the slow oxidation process of coal at low temperature.This paper helps to understand the mechanism of coal oxidation comprehensively,and provides a theoretical support for the long-term storage of coal samples and the development of special-purpose samples.Specifically,for the long-term preservation of special-purpose coal samples,low-temperature oxidation reaction of coal should be delayed from two aspects: in the case of coal with larger oxidation value,the lower pyrite content is better,while more attention should be paid into the oxidation value of coal when it contained lower pyrite content.Besides,considering the total sulfur and pyrite content in coal,the appropriate preservation water or maximum preservation water in coal should be discussed.If the coal needs to be preserved for a long time,it should be pay more attention to the changes of environmental humidity and the influence of air flow.Further,it is better to keep the air clam.

关键词(KeyWords)： 黄铁矿;煤;低温氧化;促进作用
pyrite;coal;low temperature oxidation;positive effect

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2017YFF0205305)

作者(Author): 陈思涵,白向飞,方全国
CHEN Sihan,BAI Xiangfei,FANG Quanguo

DOI: 10.13226/j.issn.1006-6772.18092101

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