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為什么測定揮發(fā)分后坩塌外表面有時(shí)出現(xiàn)黑色附著物?

2020-07-22  來自: 華維科力 瀏覽次數(shù):1219

測定揮發(fā)分后,經(jīng)常發(fā)現(xiàn),塌內(nèi)表面(包括蓋),產(chǎn)生一層黑色油光附著物,這是正?,F(xiàn)象,可在試驗(yàn)后通過高溫下灼燒的方法除去,但如果測定后坩塌蓋上和增塌外面有累狀煙垢凝聚,則是由于煤的揮發(fā)分太高,受熱逸出速度過快造成的。遇有這種情況,試驗(yàn)作廢。此時(shí)將煤樣壓成餅狀,并切成粒度約3mm小塊后測定,經(jīng)過這樣的處理之后,一般都可得到解決。

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