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Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H 2 H 2 OCOCO 2 Mixtures Relevant to a Novel Green Ironmaking Technology
Author(s) -
Mohassab Yousef,
Sohn Hong Yong
Publication year - 2015
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.201400186
Subject(s) - slag (welding) , chemistry , depolymerization , steelmaking , raman spectroscopy , water vapor , infrared spectroscopy , analytical chemistry (journal) , polymerization , fourier transform infrared spectroscopy , inorganic chemistry , environmental chemistry , chemical engineering , metallurgy , materials science , organic chemistry , physics , optics , engineering , polymer
In an effort to develop a novel green ironmaking process with the potential of steelmaking in a single continuous process the chemistry of selected slag systems were investigated. The novel process uses gaseous fuels and reductants that help reduce energy consumption and minimize greenhouse gas emissions. Amongst the proposed reductants and fuels are H 2 , natural gas (NG), and coal gas (CG). In different ironmaking processes, the molten bath (iron–slag bath) is expected to be at equilibrium with gas atmospheres of mainly H 2 /H 2 O, and CO/CO 2 /H 2 /H 2 O corresponding to the use of H 2 and NG/CG, respectively. CO/CO 2 gas mixture was studied for comparison. Based on the FTIR‐RAS (reflection absorption spectroscopy) and Raman analyses, it is expected that H 2 O stabilizes the more polymerized silicates anions rather than the depolymerized monomers. For the investigated slag compositions, slags under H 2 and NG/CG at 1550 °C had values of ψ = ( Q 0 + Q 1 )/( Q 2 + Q 3 ) (a measure of depolymerization) 75 and 55 less than slags under the CO/CO 2 atmosphere. It was concluded that the higher the water content in the gas atmosphere the more polymerized the silicates in the slag. The results of this study will, for the first time, provide new insights into the slag chemistry under H 2 O containing atmospheres.