ABSTRACT

In order to study the effect of pyrite oxidation products on the spontaneous combustion of coal, five kinds of compounds of pyrite oxidation products with 6% of a mass fraction were added to the coal sample of Yangmei No. 5 Mine. The analysis shows that the weightlessness and ignition activation energy of coal samples after adding Fe³⁺, Fe²⁺, and H⁺ are reduced compared with YM. Fe³⁺ and Fe²⁺ catalyze the free radical chain reaction during the spontaneous combustion of coal, promote the development of C = O and -CO-O-, and accelerate the oxidation reaction of -CH₃, -CH₂- and -OH. H⁺ reduces the content of Si-O-Si structure. After adding Fe(OH)₃ and S⁰, the activation energy of coal samples is higher than that of YM. Through the adiabatic oxidation experiment, it can be seen that Fe³⁺, Fe²⁺, H⁺ shorten the shortest ignition time of YM coal samples 40.7 h, 32 h, 4.6 h. Fe(OH)₃ and S⁰ prolong the shortest ignition time of YM coal samples by 7.1 h and 21.8 h, respectively. This shows that the oxidation products of FeS₂ play an important role in promoting low-temperature oxidation of coal.

摘要

为研究黄铁矿氧化产物对煤自燃的影响，在杨煤五号矿煤样中加入质量分数为6%的5种黄铁矿氧化产物化合物。分析表明，与YM相比，添加Fe ³⁺、Fe ²⁺和H ⁺后煤样的失重和着火活化能有所降低。Fe ³⁺和Fe ²⁺在煤自燃过程中催化自由基链式反应，促进C=O和-CO-O-的发展，加速-CH ₃、-CH ₂ -和-的氧化反应哦。H ⁺降低了 Si-O-Si 结构的含量。添加Fe(OH) ₃和S ⁰后，煤样的活化能高于YM。通过绝热氧化实验可以看出，Fe ³⁺、Fe ²⁺、H ⁺使YM煤样的最短着火时间缩短了40.7 h、32 h、4.6 h。Fe(OH) ₃和S ⁰分别将YM煤样的最短着火时间延长了7.1 h和21.8 h。这说明FeS ₂的氧化产物在促进煤的低温氧化方面具有重要作用。