TY - CHAP
T1 - Alkali elution of various mineralogical phases in steelmaking slag
AU - Zhu, Zuoqiao
AU - Gao, Xu
AU - Ueda, Shigeru
AU - Kitamura, Shinya
PY - 2019/1/1
Y1 - 2019/1/1
N2 - To suppress alkaline elution from steelmaking slag, the dissolution behaviors of mineralogical phases in slag need to be studied. In this paper, primary crystal phases (CaO·SiO 2 , CaO·SiO 2 ·FeO, and CaO·SiO 2 ·2MgO) of CaO–SiO 2 –FeOx and CaO–SiO 2 –MgO systems were synthesized, and their dissolution behaviors and the change in pH were investigated. The results showed that CaO·SiO 2 caused the increase in pH by the dissolution of alkali. Therefore, the alkali elution from steelmaking slag is caused by not only free CaO and 2CaO·SiO 2 but also CaO·SiO 2 . Then, slags corresponding to actual steelmaking composition in the system CaO–SiO 2 –FeOx and CaO–SiO 2 –MgO systems were synthesized and their dissolution behaviors were observed. The result showed that the pH values after the dissolution of every slag were lower than that of CaCO 3 , even though water soluble phases were contained in slag. Therefore, alkali elution from slag containing soluble phases can be suppressed when the mass fractions of these phases in slag are low enough.
AB - To suppress alkaline elution from steelmaking slag, the dissolution behaviors of mineralogical phases in slag need to be studied. In this paper, primary crystal phases (CaO·SiO 2 , CaO·SiO 2 ·FeO, and CaO·SiO 2 ·2MgO) of CaO–SiO 2 –FeOx and CaO–SiO 2 –MgO systems were synthesized, and their dissolution behaviors and the change in pH were investigated. The results showed that CaO·SiO 2 caused the increase in pH by the dissolution of alkali. Therefore, the alkali elution from steelmaking slag is caused by not only free CaO and 2CaO·SiO 2 but also CaO·SiO 2 . Then, slags corresponding to actual steelmaking composition in the system CaO–SiO 2 –FeOx and CaO–SiO 2 –MgO systems were synthesized and their dissolution behaviors were observed. The result showed that the pH values after the dissolution of every slag were lower than that of CaCO 3 , even though water soluble phases were contained in slag. Therefore, alkali elution from slag containing soluble phases can be suppressed when the mass fractions of these phases in slag are low enough.
KW - Alkaline elution
KW - Mineralogical phase
KW - Primary crystal phase
KW - Steelmaking slag
KW - pH
UR - http://www.scopus.com/inward/record.url?scp=85064062810&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85064062810&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-10386-6_25
DO - 10.1007/978-3-030-10386-6_25
M3 - Chapter
AN - SCOPUS:85064062810
T3 - Minerals, Metals and Materials Series
SP - 215
EP - 220
BT - Minerals, Metals and Materials Series
PB - Springer International Publishing
ER -