TM 5-810-15
proportions. Depending on their relative
ratio, silica/alumina ratio, iron/calcium ratio,
proportions they can combine during combustion to
iron/dolomite ratio, dolomite percentage, silica
form compounds with melting temperatures
percentage, total alkalies, and the role of iron in
ranging from 1610 degrees F for sodium silicate
coal ash can all be useful, as shown in figure 3-5.
(Na2SiO3) to 2800 degrees F for calcium silicate
The chemical elements found in coal, their oxidized
(CaSiO3). In determining the slagging potential and
forms, and the ranges in which they may be present
fouling potential of ash, studying the base/acid
in coal ash are listed in table 3-5.
3-8
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