Metallurgical Coke
Metallurgical coke is defined as a carbon-rich material produced from prime coking coal, used as a reductant in the metallurgical industry, characterized by specific properties such as low ash, low sulfur, and a maturity level that ensures adequate porosity and strength for use in blast furnaces
Introduction
Metallurgical coke is an important raw material for pig iron production in the blast furnace. During this process the coke undergoes severe mechanical, thermal and chemical stresses. One of these is the CO2-gasification which may lead to a decisive mechanical weakening of the lump coke by increased carbon burn-off. The CO2-reactivity is influenced by different parameters as e.g. temperature, gas composition and catalytic effects.
But merely thermal treatment of the coke at temperatures above 1300 °C may result in partly decisive changes in CO2-reactivity at a standardized temperature of 1100 °C. Five metallurgical cokes produced either from different coal types or from coals of substantially different origin have been heat-treated up to 1700 °C, and the subsequent reactivity has been determined according to the NSC test procedure.
Key Properties and Uses
Blast Furnace Fuel
Met coke acts as the primary fuel source in a blast furnace, providing the heat needed to melt iron ore.
Reducing Agent
It also provides a source of carbon monoxide, which reduces iron oxides (in the ore) to metallic iron.
Steel Production
The iron produced in the blast furnace is then used to manufacture steel.
Non-ferrous metal smelting
What Is metallurgical coke ?
The quality of metallurgical coke depends on ash yield and composition and the sulfur contentof the coal in addition to its rank, maceral composition, and density. Phosphorus and vanadium in coal are undesirable in the coke-forming process. Depending on the maceral and other properties, cokes of various types and strength are generated. Therefore, to produce cokes of a specific strength to support the iron ore in a blast furnace, coal blending is necessary.
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