Metallurgical coal is low-ash, low-sulfur bituminous coal. In particular, it should be low in phosphorous and sulfur. It’s usually converted to metallurgical coke by heating in an sealed oven to drive off the volatiles.
The resulting coke is used in blast furnaces as a reducing agent and fuel. The low phosphorous and low sulfur contents are desirable to avoid contaminating the pig iron.
***Metallurgical coal is low-ash, low-sulfur bituminous coal***
What is the average BTU/LB of this coal? We used 8400 Btu Wyoming coal in our power plant. Low ash, low sulfur sub-bituminous.
I use a high BTU Oklahoma coal in my blacksmithing work.