Gas calcined anthracite coal or GCA coal is produced in gas-fired furnaces under the temperature of 1300⁰C, obtaining a depolarized and partially graphitized product.
GCA has a higher carbon content and relatively higher thermal and electrical conductivity than conventional anthracite coal. Calcining is controlled to achieve a significantly lower Electrical Resistivity (E.R.- 1350 µΩm), ranging from 1250µΩm to 1450µΩm depending on customer needs. Our GCA has low moisture, volatile and sulfur content. It can be used in the manufacture of prebake electrodes, Soderberg and tamping pastes, and carbon blocks and is an excellent smelting additive due to its high purity and consistency.
GCA coal is generally used to blend with ECA coal for cost optimization.