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Coals and Cokes

Coal has four main types, or ranks—lignite, sub-bituminous, bituminous, and anthracite—in order of increasing carbon and energy content. Most of the coal burned in U.S. power plants is bituminous or sub-bituminous coal. 

A fifth type, called metallurgical, or “coking” coal, is used for steelmaking. Coke is a residue remaining after certain types of coals are heated to a high temperature until substantially all of the volatile constituents have been driven off. The resulting residue is largely carbon, with minor amounts of hydrogen and sulfur. 

All types of coal also contain sulfur, which when burned, releases toxic air pollution. When these materials are combusted sulfur will be released in the form of sulfide and hydrogen sulfide, which will impact water environment, acidify the soil and do great harm to plants and health.

Levels of sulfur in coal/coke can be determined with the use of a high temperature tube furnace in an oxygen rich environment. The analysis is done in accordance with ASTM D4239 and under ISO/IEC 17025 and 17034 certifications to ensure the quality of products.

 

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Latest News

Stevensville, Michigan, October 13, 2020 – Alpha Resources LLC, the largest manufacturer of aftermarket consumables and reference materials, is pleased to announce the following certified reference materials have been released in Q3 of 2020. Please click to read complete details.

Stevensville, Michigan, October 6, 2020  - Alpha Resources LLC  has produced their first Inconel Certified Reference Material, AR 943. Inconel alloys, based on nickel and chromium, are considered “super alloys” due to their exceptional high-temperature resistance and corrosion resistance. Please click to read complete details.