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Coal, Coke, Clinker, Kitten, Cartwright.

For those of you who have never had the pleasure of burning coal fires, here are a few tidbits you may find interesting.
Coal, or green coal like the stuff pictured in the bottom left, is found in layers or seams underground much like oil. This part, you probably know.. Different seams, even those found within the same mountain, have varying degrees of quality due to differences in chemical composition, and impurities they contain.
Green coal is burned pretty much as it was found underground, but broken into smaller pieces. When it begins to burn, it lets off a thick, white or yellowish smoke until a bit of heat is generated, after which the amount of smoke reduces significantly.
At this point Breeze Coke starts to develop when the bitumen in the coal starts melting. It becomes unbelievably sticky and clumps together in a burning mass. This is actually relatively useful depending on how you need to heat your metal.
Once a fire has been burning for a bit and becomes hot enough, the bitumen is burned off completely, leaving behind Coke, a much lighter product that bears a resemblance to lava rock. Coke burns hotter than green coal, and is what’s ultimately responsible for generating the heat required to heat our steel to forging temperatures.

The clinker, Pictured in the top left, is a hard metallic blob of impurities and crap from inferior coal. These ones just happened to come from a mystery batch of nasty coal. – – – #Coal #Coke #Blacksmith #CoalFire #CatsOfInstagram

See the original post here.