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铝粉遇火受潮容易燃烧爆炸 | 2011-10-3 15:19:00
铝粉遇火受潮容易燃烧爆炸
铝粉又叫银粉,别名铝银粉,是一种银白色粉末,质地轻,浮力大,遮盖力强,稳定性高,反射光和传热性能好。它能溶于酸、碱,同时置换出氢气,不溶于水,遇少量水或受潮会发生化学反应,释放出氢气和热量,如果积热不散,容易引起燃烧和爆炸。
铝粉的火灾危险性在于,其粉尘飞扬与空气混合,若遇火星会发生爆炸和燃烧。铝粉的最小着火能量是50毫焦耳,最低爆炸极限浓度是25克/立方米,与其他氧化剂混合也能形成爆炸性混合物。若与酸、碱接触会产生氢气,而氢气在空气中也容易燃烧和爆炸。
由于铝粉容易燃烧和爆炸,因此应将其储存于干燥通风的仓库内,远离火种及热源。同时应与酸、碱和氧化剂隔离存放,切忌混储混运。搬运时应轻装轻卸,防止包装破损。在使用、生产、储存及保管运输等过程中要极为小心。
雨天不宜运输铝粉。一旦发现铝粉起火燃烧爆炸,应迅速用干石灰粉扑灭,切忌用水及二氧化碳、四氯化碳灭火器灭火,也不能用有压力的干粉灭火器灭火。因为水与高温铝粉接触会置换出氢气,有喷射压力的干粉会把铝粉扬起来与空气混合,从而加剧燃烧。
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