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采用五氟苄基溴对焦硫化铁在空气中氧化生成的还原性硫S~(2-)、S_2~(2-)、S_3~(2-)、S_8烷基化,对烷基化衍生物进行GC-MS表征,比较检测出的各种还原硫物质的生成量曲线与焦硫化铁的氧化放热曲线。结果表明,多聚硫中S_2~(2-)、S_3~(2-)是焦硫化铁氧化放热过程中的主要还原剂,其迅速生成与氧化是焦硫化铁氧化、放热并引发自燃的主因。根据生成的S_n~(2-)可以标识出焦硫化铁氧化及自燃的孕育程度,这有利于揭示硫铁化物氧化并引发自燃的深层原因。
The reduction of S_2 ~ (2 -), S_2 ~ (2 -), S_3 ~ (2 -) and S_8 reductive sulfur generated from the oxidation of iron sulfide by pentafluorobenzyl bromide in air was studied. The alkylation of alkylated derivatives GC-MS was used to characterize the oxidation curves of the various sulfur compounds produced and the oxidation exothermic curves of the iron sulfides. The results show that S_2 ~ (2 -) and S_3 ~ (2-) in polysulfide are the main reducing agents in the exothermic oxidation of iron pyrithione. The rapid formation and oxidation of polysulfide is the oxidation and pyrolysis of iron pyrithione, The main reason. According to the generated S_n ~ (2-), the degree of oxidation of pyro-sulfide and the degree of spontaneous combustion can be identified, which is helpful to reveal the underlying causes of the oxidation of pyrite and the initiation of spontaneous combustion.