Treatment of LF slag to prevent powdering during cooling
The polymorphic transformation of the monoclinic β-polymorph to the orthorhombic γ-polymorph of di-calcium silicate at around 500°C during cooling results in disintegration of slag. The slag generated, during the production of thermo mechanically treated steel in ladle furnace at M/s Tata...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700004G.pdf |
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| Summary: | The polymorphic transformation of the monoclinic β-polymorph to the
orthorhombic γ-polymorph of di-calcium silicate at around 500°C during
cooling results in disintegration of slag. The slag generated, during the
production of thermo mechanically treated steel in ladle furnace at M/s Tata
Steel Limited, Jamshedpur, India, behaves in similar manner. An attempt has
been made to prevent the crumbling of ladle furnace slag. The experiments
were conducted in 10 kg air induction furnace. Various types of silica
source were used to prevent the disintegration of ladle furnace slag by
reducing the basicity and optimizing the additives amount. Apart from silica
sources, other additives like borax and barium carbonate were also used to
stabilize the β phase. Present investigation reveals that disintegration of
ladle furnace slag can be prevented either by addition of 0.2% boarx or 2%
barium carbonate. Dust formation can also be prevented by decreasing the
ladle furnace slag basicity to about 1.7. Toxicity Characteristic Leaching
Procedure test, of the borax and barium carbonate treated slag samples,
indicates that barium carbonate treated slag cannot be used for the dusting
prevention as it contains high level of barium. |
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| ISSN: | 1450-5339 2217-7175 |