Abstract
Abstract The objective of the present study was to evaluate the effect of high additions of petroleum coke on the rheological properties of coking coal and the quality of cokes produced on pilot scale at the Usiminas R&D Center. For this purpose, blends using petroleum coke additions of 5%, 10%, 20%, 30% and 40% were produced. The results showed that the blends were able to satisfactorily absorb up to 30% of petroleum coke, keeping the quality (DI, CRI and CSR) similar to the industrial mixture. The observed main textural components were: mosaic, fragmentary, fusite and anisotropic inert. In general, before CRI, cokes showed good cohesion, with the petroleum coke having been absorbed by the coke matrix. After the reaction with CO2, there was verified a preferential consumption of the textures fusite, fragmentary and anisotropic inert due to the Boudouard reaction, besides the deterioration of the interfaces between the petroleum coke and coke matrix. In addition, the results showed that the increase of mosaics contributes to the increase of cokes DI15-150 and CSR. Finally, for the coal blend employed, it is suggested the utilization of a maximum of 30% additions of petroleum coke.
Highlights
Metallurgical coke, obtained by carbonizing an appropriate blend of coals at temperatures up to 1100°C is the most suitable reducing agent for the blast furnace
It is often assumed that petroleum coke behaves as inert material in cokemaking; its inclusion in coking blends has an important influence on the properties of metallurgical cokes
With respect to maceral composition, coals showed moderate to high vitrinite (45.8 vol% to 70.3 vol%) and moderate to high inertinite (22.1 vol% to 54.2 vol%) contents
Summary
Metallurgical coke, obtained by carbonizing an appropriate blend of coals at temperatures up to 1100°C is the most suitable reducing agent for the blast furnace. Decreasing availability of prime coking coals and problems related to supply, have led coking companies to look for alternative raw materials and to redesign blends with lessened properties (Flores et al, 2017). In this scenario, petroleum coke (PC) became an interesting additive to cokemaking because of its properties and availability (Menéndez et al, 1997). It is often assumed that petroleum coke behaves as inert material in cokemaking; its inclusion in coking blends has an important influence on the properties of metallurgical cokes Contradictory reports concerning the beneficial (Menéndez et al, 1997; Pis et al, 2002; Zorin et al, 2015) or detrimental (BCRA, 1974; Kiran et al 2013) effect of PC on coke quality can be found in literature
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