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煤的坩堝膨脹序數試驗步驟
作者:    發布于:2023-12-06 10:20:01    文字:【】【】【

煤的坩堝膨脹序數試驗步驟

將煤樣置于專用坩堝中,按規定的程序加熱到(820±5)℃。所得焦塊和一組帶有序號的標準焦塊側形圖相比較,以最接近的焦型序號作為坩堝膨脹序數。

1 稱?。?.00±0.01)g空氣干燥煤樣,放入坩堝中并晃平,然后在厚度不小于5 mm的膠皮板上,用手的五指向下抓住裝有煤樣的坩堝,提起約15rrnn高度,松手使之自由落下。如是落下共12次(每落 下一次將坩堝旋轉一個角度)。
2 打開爐蓋,將裝有煤樣的坩堝放人已加熱至預定溫度的爐內石英皿的中心部位,立即用不帶孔的坩堝蓋蓋住,同時啟動秒表計時,至揮發物全部逸出,逸出時間不得少于2.5 min。然后將坩堝取出。此過程不蓋電爐蓋。
3 每個煤樣相繼試驗3次。3次試驗完畢后,小心地將坩堝中的焦渣倒出,待焦渣冷卻至室溫后測定焦型。如3次測定值的極差超過1/2,應增加兩個單次試驗。如5次測定值的極差超過1,應檢查儀器設備,重新進行5次測定。
注:在兩次試驗間隙,蓋上電加熱爐蓋,以使爐溫盡快回到預先設定的溫度。
4 試驗結束后,將坩堝和坩堝蓋上的殘留物灼燒去除,擦凈。
 
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