Explosibility and thermal decomposition behavior of nitrile rubber dust in industrial processes

The formation of nitrile rubber (NBR) dust clouds during processing can lead to a potential dust explosion under certain conditions. However, the potential explosion hazard posed by NBR dust is usually overlooked by enterprises. In this paper, the explosive properties of NBR dust are investigated using a Hartmann tube, a G-G furnace, and a 20 L explosion chamber. The results showed that NBR dust could cause explosions severe enough to be classified as St-1. In addition, the thermal decomposition behavior of NBR dust under combustion conditions was investigated using a combination of thermogravimetric analysis coupled with Fourier transform infrared spectroscopy (TGA-FTIR). The results indicated that in the early stage, NBR dust mainly undergoes self-thermal decomposition to produce a large amount of combustible gas, which combines with oxygen to form a mixed gas and cause a gas-phase explosion. In addition, the participation of oxygen could lower the initial temperature of NBR dust thermal decomposition. As a result, decomposition occurred more quickly and a large amount of combustible gas was produced, thus expanding the range of dust explosions. Furthermore, these combustible gases exhibit varying degrees of toxicity, seriously affecting the life and health safety of relevant personnel. This work provides theoretical guidance for the development of safe procedures to prevent and address problems during NBR dust processing in enterprises.     

顺丁橡胶生产过程中危害因素分析及对策

分析了顺丁橡胶生产过程中的危险有害因素主要有火灾爆炸、中毒等，并提出了相应对策。     

混凝法处理混合化工废水的试验研究

丁苯胶乳废水、SMA废水、苯丙基料废水和苯丙乳胶漆废水的浓度较高，毒性较大，可生化性低。采用混凝法进行预处理可去除其中大量有机物，从而极大降低废水的有机物浓度，并可提高废水的可生化性。本文重点讨论了不同参数条件对废水处理效果的影响，得出了最佳工艺路线。