Coal Analysis

While at the meet and greet I had wanted to ask about coal analysis and totally forgot. Would anyone care to explain what it all means. Here is a link to Jeddo coal I just picked them cause they list there specs on the net, http://www.jeddocoal.com/ , look at the specs section. what does (D.B.) mean, and F.C. % ect. anything else that they might not have listed would be great to know. The tour of the breaker just really got me thinking about coal, and I would just like to know a little more.

Thanks in advance, Eric

I think that:

F.C.% = percentage of free carbon
A.R. = As Received (including the moisture)

What is D.B.

Dry Basis (as in : on a dry basis)

Only a laboratory can achieve this level of dryness I believe.

fixed carbon
dry basis (lab removes water - artificially gives coal a higher heating value)
as received

That's a nice analysis and it demonstrates what people often misunderstand. Unless your anthracite has well under 10% ash, you're not going to have 13,000btu/lb or above as received. When you do see numbers quoting 13,000btu/lb or above, it's not AR, but dry basis, ash free, or some other variation.

Can you tell if it's white ash or red ash coal? How do you get that info from this kind of analysis?

dj

Red ash coal will have more pyrite and thus more iron and sulfur, however, this is not always the case, iron can be found in coal in other forms (which tends to turn the ash red). For the most part, coal with higher sulfur content will be pink or red ash coals. In general, under .8% sulfur (iron pyrite is FeS2) will be white ash coal, and as the coal increases in sulfur content from .8% to 1.5% you'll get pink ash, and from 2% onward it will become "brick" red, provided the sulfur is not "organic sulfur compounds" but due to pyrite. This is also why red ash coals will often tend to clinker more easily.