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炉灰,又称炉灰渣,它是燃煤锅炉或炉灶排放的废弃物。炉灰一般不含氮,只含少量的磷(0.29％)和钾
Ash, also known as ash, it is the waste discharged from coal-fired boilers or stoves. Ashes generally do not contain nitrogen, only a small amount of phosphorus (0.29%) and potassium