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珍珠岩

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膨胀珍珠岩

珍珠岩(英语:Perlite),在台湾又称珍珠石,是一种类似流纹岩的酸性火山喷发熔岩,由于喷发后急速冷却,形成球粒状玻璃岩石,有弧形或圆形裂纹,尤如珍珠的结构,所以被命名为珍珠岩。

珍珠岩一般为浅灰色、淡绿色褐色二氧化硅含量达70%,分含量为3-5%,当将珍珠岩加热到850–900℃时,由于玻璃质软化,其中水分蒸发,造成体积膨胀,可以达到原有体积的7–16倍,为膨胀珍珠岩。

膨胀珍珠岩具有吸音性好,吸湿性小,抗冻性强的性能,因此被广泛用作建筑的保温隔音材料,也可以作为农业改良土壤,增加保暖保冷 (保墒) 能力的材料,此外在工业的铸造、酿造、过滤、洗涤等工艺中也可以作为辅助材料应用。

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珍珠岩
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