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slag
(redirected from basic slag)

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slag: see metallurgy metallurgy (mĕt`əlûr'jē), science and technology of metals and their alloys .
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slag

By-product formed in smelting, welding, and other metallurgical and combustion processes from impurities in the metals or ores being treated. Slag consists mostly of mixed oxides of elements such as silicon, sulfur, phosphorus, and aluminum; ash; and products formed in their reactions with furnace linings and fluxing substances such as limestone. During smelting or refining, slag floats on the surface of the molten metal, protecting it from oxidation (see oxidation-reduction) by the atmosphere and keeping it clean. Slag cools into a coarse aggregate used in certain concretes; it is used as a road-building material, as ballast, and as a source of available phosphate fertilizer.



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? Mentioned in ? References in periodicals archive
 
Slag Composition--Maintaining low levels of ferrous oxide (FeO) and MnO in a slag is important to produce minimum S levels in the iron by creating neutral or basic slags.
Improved cupola melting with silicon carbide and ferrosilicon by Mutton, T.J. / Modern Casting
Primary Ductile Iron Melting & Holding (by % of foundries) Melting Large Foundries Small Foundries Cupola 1978 1988 1998 1978 1988 1998 Acid Slag 26 42 20 20 2 6 Basic Slag 13 15 3 5 0 2 Neutral Slag NA 4 7 NA 2 0 Coreless 45 38 62 44 84 83 Arc 15 4 1 13 6 0 Channel 15 4 12 22 22 8 Other 0 0 0 0 2 3 Holding Channel 30 46 43 7 24 7 Coreless 6 15 11 5 10 3 Arc 9 8 0 2 0 0 Forehearth NA 15 5 NA 0 1 Other 9 8 5 5 2 2 Table 2.
Ductile iron trends: reducing costs, improving quality by Muratore, Eugene C. / Modern Casting
The result is a more basic slag, which promotes faster wear of the silica refractory lining.
Lessons Learned During Medium-Frequency Coreless Induction Melting by Copi, Ken / Modern Casting
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