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Laboratory investigations into the phenomenon of swelling and foaming in synthetic iron oxide gangue specimens
Author(s) -
Schliephake Henning,
Ren Jinguo,
Koch Klaus,
Lamut Jakob
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301559
Subject(s) - swelling , chemistry , induction period , oxide , slag (welding) , metallurgy , materials science , chemical engineering , mineralogy , nuclear chemistry , polymer chemistry , composite material , organic chemistry , engineering , catalysis
Experiments into the swelling and foaming of synthetic iron oxide gangue melts prove that two basic prerequisites have to be met for the occurrence of these phenomena. Firstly there must be present within the specimens relatively large volume fractions of a liquid FeO‐containing phase which come into contact with carbon. This leads to heavy gas formation. Secondly, slags of this type must exhibit a certain gas retention capability. In this respect, a precipitated iron support skeleton can be helpful. Medium‐basic slags swell very well and over a relatively long period. Highly basic slag melts, following a brief period of swelling, are quickly resolidified by 2CaO‐SiO 2 precipitation. In the case of acidic specimens, only a small or no volume increase is observed. Pure iron oxide melts undergo virtually no swelling whatsoever.