The heat evolved is extracted from the melt by submergence of solid to be heated into the melt, by injection of heated gases into molten slag, by {HEAD ~ heat exchange} between the wall confining the melt and {TAIL ~ gas}, liquid or solid to be heated, or by conversion of steam into H2 and CO 
The heat evolved is extracted from the melt by submergence of solid to be heated into the melt , by injection of heated gases into molten slag , by { HEAD ~ heat exchange } between the wall confining the melt and { TAIL ~ gas } , liquid or solid to be heated , or by conversion of steam into H2 and CO
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