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New page: Ash is an impurity consisting of silica, iron, alumina, and other noncombustible matter that are contained in coal. Ash increases the weight of coal, adds to the cost of ...
Ash is an impurity consisting of [[silica]], [[iron]], [[alumina]], and other noncombustible matter that are contained in [[coal]].

Ash increases the weight of coal, adds to the cost of handling, and can affect its burning characteristics.
[[Category:Energy]]
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