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Mineral Related CO 2 and H 2 O Emissions during the Production of Metallurgical Coke
Author(s) -
Gornostayev Stanislav S.,
Heikkinen EetuPekka,
Heino Jyrki J.,
Fabritius Timo M. J.,
Härkki Jouko J.
Publication year - 2013
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200296
Subject(s) - magnesite , coke , coal , calcite , dolomite , mineral , porosity , metallurgy , carbon fibers , mineralogy , kaolinite , materials science , chemistry , magnesium , organic chemistry , composite number , composite material
During coking processes, certain coal‐associated minerals undergo various chemical changes, amongst which are dehydration, dehydroxylation, and decarbonation. In order to evaluate the character of CO 2 and H 2 O emission by a particular mineral, thermodynamic calculations for theoretical gas production were performed. Observations showed that the behavior of carbonates in respect of CO 2 emission vary substantially and, for that reason, their influence on the properties of coke differ. The amount of mineral‐associated CO 2 released during the coking process is smaller than that which is produced by a carbon‐based matrix. For each ton of coal, containing 1 wt% of carbonates, there will be c. 17.6–22.0 m 3 of CO 2 present at the stabilization stage of the coking process. However, the impact of a mineral‐related gas phase should not be underestimated (in particular, for porosity development and cracks formation), mostly when the grain size of the minerals is quite large. The major CO 2 ‐related impact on coke properties can be referred to dolomite, magnesite, and calcite. The amount of H 2 O released by each ton of coal containing 1 wt% of phyllosilicates, can be approximately 0.88–9.68 m 3 at the stabilization stage of a coking process. The presence of OH − and H 2 O‐bearing minerals, especially montmorillonite, can affect coke reactivity, pores formation, and cause formation of micro cracks.