There are many differences between CFB ash residue and common ash residue because CFB boiler burn at lower temperature and desulfurizer is put during combustion.

循环流化床锅炉属于低温燃烧，并且燃烧过程加入了大量的脱硫剂，导致其产生的灰渣较普通粉煤灰有很大差异。

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In most areas, the ash contains less uranium than some common rocks.

在大部分地区，浮尘含有的含有的铀比普通岩石中的含量还低。

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At that time, Mom and Dad in the yard Common crushed "cinder child", "cinder child" is to use coal ash and the soil and into the inside bend, and the general soil not, non-stick.

那时候，常见爸妈在院子里砸“煤渣子”，“煤渣子”是用煤灰和河湾里的泥土和成的，一般的土不行，不粘。

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It's most common in hard maple, but also occurs in birch, ash and, in rare cases, black walnut.

NPR: Excerpt: 'A Splintered History Of Wood'