Slags - vscht.czvun/Metalurgie/Slags.pdf · properties and structure of liquid slags. Slag....
Transcript of Slags - vscht.czvun/Metalurgie/Slags.pdf · properties and structure of liquid slags. Slag....
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Slags
The majority of refining reactions required in liquid metals occurs around
liquid slag - liquid metal interface
Important to know: the functions, properties and structure of liquid slags
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Slag
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Functions of slag
protection of the melt from contamination
insulation of the melt
accepting unwanted liquid and solid components
controlling the supply if refining media to the melt through addition to the slag
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Properties of slag
lower melting point than melt
lower specific gravity than and immiscible in the melt
correct composition in order to accept and react with impurities
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What is slag?
solution of mixed oxides, silicates, sometimes with aluminates, phosphates or borates
slag forming reactions are endothermic
2 types of slag oxides: basic and acidic
CaO, FeO, MgO, Cu2O, Na2O, K2O
SiO2, P2O, Al2O3
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Properties of slag
slag’s basicity
electrical and thermal conductivities
Viscosity of slags: ~ composition and temperature