自然环境条件下硫化铁自燃的影响因素

硫化铁在空气中氧化放热是引发自燃着火事故的内在因素,连续的供氧和热量易于集聚是硫化铁自燃的外部因素。在自然环境条件下对硫化铁进行氧化实验,实验结果表明,Fe2O3硫化后生成的硫铁化合物活性很高,具有较高的自然氧化活性,在室温下可迅速与空气中的氧气反应,同时放出大量的热。以Fe2O3的硫化产物为典型样品,研究了环境温度、风速、硫化时间、暴露面积以及硫化铁质量对氧化升温特征的影响。环境温度对于升温速率影响不明显;风速具有促进和抑制硫化铁自燃进程的双重作用,风速为1.5 m/s时,氧化放热强度达到最高;硫化时间长、暴露面积大以及较多的硫化铁能够加速氧化升温过程,反之则降低了硫化铁的自燃倾向性。

Effect Factors for Spontaneous Combustion of Iron Sulfide in Natural Environment

Intrinsic factor leading to self-ignition of iron sulfide includes oxidizing and sending out heat in the atmosphere.External factor includes continuous oxygen supply and heat easily being accelerated.Oxidation experiments of iron sulfide were made in natural environment.The results show that iron sulfide has greater activity and natural oxidation tendency,which can react with oxygen in open system at room temperature and simultaneously result in releasing lots of heat.Effects of environment temperature,air speed,sulfuration time,exposed area and mass of FeS on spontaneous combustion were investigated using the same sulfides formed from Fe_2O_3.The results show that environment temperature has no significant influence on oxidation process of iron sulfide,air speed has double roles which can either promote or prevent development of self-ignition process and the heat-sending-out intensity of oxidation reaches the maximum when air speed is 1.5 m/s,the longer sulfuration time,the bigger exposed area together with more FeS can accelerate oxidation process and temperature rising,otherwise the spontaneous combustion tendency will be lessened.