CHEN Sihan;BAI Xiangfei;FANG Quanguo;

• 1:Test Branch of China Coal Research Institute
• 2:State Key Laboratory of Coal Mining and Clean Coal Utilization
• 3:Coal Chemistry Branch of China Coal Research Institute

Abstract：

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.

Key Words： pyrite;coal;low temperature oxidation;positive effect

Abstract:

Keywords:

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

Authors: CHEN Sihan;BAI Xiangfei;FANG Quanguo;

DOI: 10.13226/j.issn.1006-6772.18092101

References：

• [1]王省身,张国枢.矿井火灾防治[M].徐州:中国矿业大学出版社,1990.
• [2]邓军,徐精彩,陈晓坤.煤自燃机理及预测理论研究进展[J].辽宁工程技术大学学报,2003,22(4):455-459.DENG Jun,XU Jingcai,CHENG Xiaokun. Perspectives on spontaneous combustion mechanism and prediction theory of coal[J].Journal of Liaoning Technical University,2003,22(4):455-459.
• [3]张振文,宋志,李阿红.煤矿矸石山自燃机理及影响因素分析[J].黑龙江科技学院学报,2001,11(2):12-14.ZHANG Zhenwen,SONG Zhi,LI Ahong. Analysis of gangue hill spontaneous combustion and its affecting factors[J]. Journal of Heilongjiang Institute of Science&Technology,2001,11(2):12-14.
• [4]赵雪娥,蒋军成,张明广,等.自然环境条件下硫化铁自燃的影响因素[J].石油化工高等学校学报,2006,19(3):68-70.ZHAO Xuee,JIANG Juncheng,ZHANG Mingguang,et al. Effect factors for spontaneous combustion of iron sulfide in natural environment[J]. Journal of Petrochemical Universities,2006,19(3):68-70.
• [5]邓军,黄鸿剑,金永飞,等.高湿环境下高硫煤低温氧化特性试验[J].煤矿安全,2013,44(12):32-35.DENG Jun,HUANG Hongjian,JIN Yongfei,et al. Experiment on low temperature oxidation characteristics of high-sulfur coal in high humidity environment[J]. Safety in Coal Mines,2013,44(12):32-35.
• [6]张慧君,王德明,戚绪尧,等.干燥条件下高硫煤低温氧化特性研究[J].中国安全科学学报,2012,22(4):127-131.ZHANG Huijun,WANG Deming,QI Xuyao,et al.Analysis of high sulfur coal low temperature oxidation characteristics at dry conditions[J].China Safety Science Journal,2012,22(4):127-131.
• [7]吴超,孟廷让,王坪龙,等.硫化矿石自燃的化学热力学机理研究[J].中南大学学报(自然科学版),1994,25(2):156-161.WU Chao,MENG Tingrang,WANG Pinglong,et al. Research on the chemical thermodynamics mechanism for the spontaneous combustion of sulphide ores[J]. Journal of Central South University(Science and Technology),1994,25(2):156-161.
• [8]仇勇海.狭义氧化还原电场——含炭地质体自然极化机理的研究[J].地质与勘探,1985(8):45-51.QIU Yonghai.Narrow sense redox electric field:Study on the mechanism of natural polarization of carbonaceous geological bodies[J].Geology and Prospecting,1985(8):45-51.
• [9] BANERJEL S C. Spontaneous combustion of coal and mine fires[M].Rotferdam:[s.n.],1985.
• [10]刘光启,马连湘,项曙光,等.化学化工物性数据手册(无机卷)[M].北京:化学工业出版社,2013.
• [11] CLEMENS A H,MATHESON T W. The role of moisture in the self-heating of low-rank coals[J].Fuel,1999,75(7):891-895.
• [12]李永昕,薛冰,李再峰,等.凝结热对低阶煤低温氧化过程的影响[J].燃料化学学报,2006,34(4):408-411.LI Yongxin,XUE Bing,LI Zaifeng,et al. Effect of condensation heat on low temperature oxidation of a low rank coal[J]. Journal of Fuel Chemistry and Technology,2006,34(4):408-411.
• [13]薛冰,柳娜,李永昕,等.低阶煤低温氧化过程热力学规律的研究[J].煤炭转化,2007,30(3):1-4.XUE Bing,LIU Na,LI Yongxin,et al.Study on the thermodynamic law of low temperature oxidation of low rank coal[J]. Coal Conversion,2007,30(3):1-4.
• [14]任俊,沈健,卢寿慈.颗粒分散科学与技术[M].北京:化学工业出版社,2005:167-204.
• [15]胡慧萍.机械活化硫化矿结构与性质变化规律的基础研究[D].长沙:中南大学,2003.
• [16] EYMERY J P,YLLI F.Study of a mechanochemical transformation in iron pyrite[J]. Journal of Alloys and Compounds,2000,298(1):306-309.
• [17] WARRIS C J,MCCPRMOCK P G.Mechanochemical processing of refractory pyrite[J]. Mineral Engineering,1997,10(10):1119-1125.
• [18]黎铉海,黄祖强,刘雄民,等.机械活化作用下载金矿物的形貌特征[J].金属矿山,2001(1):31-33.LI Xuanhai,HUANG Zuqiang,LIU Xiongming,et al. Characteristics of the shape and appearance of the gold carrying minerals under the function of mechanical activation[J]. Metal Mine,2001(1):31-33.
• [19]邹俭鹏,尹周澜,陈启元,等.机械活化黄铁矿物理性能和表面结构变化的表征[J].湖南有色金属,2001,17(5):36-39.ZOU Jianpeng,YIN Zhoulan,CHEN Qiyuan,et al. Characterization of physical properties and surfacial structure of activated pyrite[J].Hunan Nonferrous Metals,2001,17(5):36-39.
• [20]王克威,刘晓霞,阳富强,等.机械力作用下硫化矿石的常温氧化增重特性[J].采矿技术,2016(4):58-61.WANG Kewei,LIU Xiaoxia,YANG Fuqiang,et al. The oxidation weight gain characteristics of mechanical activated sulfide ores under normal temperature[J].Mining Technology,2016(4):58-61.
• [21]阳富强,黄贤煜.机械力活化硫化矿石的吸附孔分形表征[J].有色金属(选矿部分),2017(2):60-66.YANG Fuqiang HUANG Xianyu. Fractal characterization of adsorption-pore for mechanically activated sulfide ores[J]. Nonferrous Metals(Mineral Processing Section),2017(2):60-66.
• [22]阳富强,刘广宁,刘晓霞.机械力作用诱导硫化矿石自燃的微观机理[J].中南大学学报(自然科学版),2017,48(6):1629-1634.YANG Fuqiang,LIU Guangning,LIU Xiaoxia.Microscopic mechanism of mechanical forces to induce spontaneous combustion of sulfide ores[J]. Journal of Central South University(Science and Technology),2017,48(6):1629-1634.
• [23]郗朋,刘文礼,韩永华,等.煤系黄铁矿晶格缺陷与可浮性的机理研究[J].煤炭学报,2016,41(4):997-1003.XI Peng,LIU Wenli,HAN Yonghua,et al. Study on the mechanism of coal pyrite crystal lattice defects and floatability[J].Journal of China Coal Society,2016,41(4):997-1003.
• [24]仇勇海,陈白珍.金属硫化矿体自燃的电化学机理[J].中国有色金属学报,1995(4):1-4.QIU Yonghai,CHEN Baizhen. Electrochemical mechanism of spontaneous combustion of metal sulfide ore[J]. The Chinese Journal of Nonferrous Metals,1995(4):1-4.
• [25]卢龙,雷良城,林锦富,等.矿物表面特征和表面反应的研究现状及其应用[J].桂林理工大学学报,2002,22(3):354-358.LU Long,LEI Liangcheng,LIN Jinfu,et al. Study on the physical and reactive nature of mineral surfaces:Advances and applications[J].Journal of Guilin Institute of Technology,2002,22(3):354-358.
• [26]王淀佐,龙翔云,孙水裕.硫化矿的氧化与浮选机理的量子化学研究[J].中国有色金属学报,1991(1):15-23.WANG Dianzuo,LONG Xiangyun,SUN Shuiyu.Quantum chemistry study on the mechanism of oxidation and flotation of sulfide ores[J].The Chinese Journal of Nonferrous Metals,1991(1):15-23.
• [27]卢龙,王汝成,薛纪越,等.黄铁矿表面次生色:氧化程度的标志[J].矿物学报,2002,22(3):211-216.LU Long,WANG Rucheng,XUE Jiyue,et al. Secondary surficial color of pyrite:An indicator of oxidation degree[J].Acta Mineralogica Sinica,2002,22(3):211-216.
• [28] REEDY B J,BEATTIE J K,LOWSON R T.A vibrational spectroscopic18O tracer study of pyrite oxidation[J].Geochimica Et Cosmochimica Acta,1991,55(6):1609-1614.
• [29] NESBITT H W,MUIR I J. X-ray photoelectron spectroscopic study of a pristine pyrite surface reacted with water vapour and air[J]. Geochimica Et Cosmochimica Acta,1994,58(21):4667-4679.
• [30] SCHAUFUSZ A G,NESBITT H W,KARTIO I,et al.Incipient oxidation of fractured pyrite surfaces in air[J]. Journal of Electron Spectroscopy and Related Phenomena,1998,96(1):69-82.
• [31] USHER C R,PAUL K W,NARAYANSAMY J,et al.Mechanistic aspects of pyrite oxidation in an oxidizing gaseous environment:An in situ HATR-IR isotope study[J].Environmental Science&Technology,2005,39(19):7576-7584.
• [32] LI Y,CHEN J,CHEN Y,et al. Interactions of oxygen and water molecules with pyrite surface:A new insight[J]. Langmuir,2018,34(5):1941-1952.