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硅藻土(diatomite)是单细胞水生植物硅藻的残骸沉积物,呈白色或灰色,它的个体很微小,一般为20-40μm,最小的不足1μm。硅藻土的主要成分是无定型二氧化硅,二氧化硅含量常超过70%,并含有少量三氧化二铁、氧化钙、氧化镁、三氧化二铝及有机杂质。天然硅藻土(生硅藻土)的游离二氧化硅含量一般为8%~9%;生硅藻土经1200℃煅烧,使结合的二氧化硅变游离状态,游离二氧化硅含量可达50%~60%,具有一定的致纤维化作用。随着现代工业的发
Diatomite is a debris deposit of single-cell aquatic plant diatoms, white or gray, and its individual is very small, usually 20-40μm, the smallest less than 1μm. Diatomaceous earth is the main component of amorphous silica, silica content often more than 70%, and contains a small amount of ferric oxide, calcium oxide, magnesium oxide, aluminum oxide and organic impurities. The free silica content of natural diatomite (raw diatomaceous earth) is generally 8% ~ 9%; raw diatomaceous earth calcined at 1200 ℃, the bonded silica becomes free state, the free silica content up to 50% ~ 60%, with a certain cause of fibrosis. With the development of modern industry