Nitrogen solubility in molten CaO-SiO2 slags

Citation
Hg. Oltmann et al., Nitrogen solubility in molten CaO-SiO2 slags, J SA I MIN, 99(2), 1999, pp. 97-102
Citations number
9
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY
ISSN journal
0038223X → ACNP
Volume
99
Issue
2
Year of publication
1999
Pages
97 - 102
Database
ISI
SICI code
0038-223X(199903/04)99:2<97:NSIMCS>2.0.ZU;2-S
Abstract
The equilibrium nitrogen solubility in the CaO-SiO2 system was studied by a slag-gas equilibration technique, in graphite crucibles at 1823K under a C O-N-2 atmosphere. The nitrogen content of the slags was determined by the K jeldahl method. A reliable technique was used to obtain an initial nitrogen content in the master slags, from the addition and pre-melting of silicon nitride. Reduction of silica by graphite was found to occur during the equi libration experiments, resulting in compositional changes of the slags. The results were extrapolated to equilibrium by kinetic evaluation of the data . The nitrogen solubility showed good agreement with the result of Suite an d Sane, while Fruehan's results were lower. However, the results of the pre sent study do not support the maximum nitrogen solubility values found by S ane.