Semi-coke
Category
Semi‑coke, also known as “blue coke,” is a black or grayish‑black solid produced by medium‑temperature dry distillation—typically at temperatures around 600–800°C—of low‑rank coals, including lignite, long‑flame coal, non‑caking coal, and weakly caking coal. Semi‑coke generally exhibits high fixed carbon content, high electrical resistivity, high chemical reactivity, low ash, low aluminum, low sulfur, and low phosphorus levels; its specific performance characteristics are influenced by the composition of the feedstock coal. It is primarily used in industries such as chemicals, metallurgy, and gasification to produce calcium carbide, ferroalloys, ferrosilicon, silicon carbide, silicomanganese alloys, fertilizers, and other products, and it also serves as a clean fuel for domestic applications. In the steel industry, semi‑coke is mainly employed for blast furnace injection and as a sintering fuel. When used for blast furnace injection, its primary function is to replace bituminous and anthracite coals traditionally used in this process. Based on current practical performance, semi‑coke can partially or fully substitute coal in blast furnace injection without requiring major adjustments to existing operational procedures. In addition to blast furnace injection, semi‑coke can also partially replace coke breeze, thereby conserving coke and reducing smelting costs. For blast furnace injection, it primarily replaces the coke fines or anthracite currently used in sintering.
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