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<p>industries) and <a href="page.php?w=upcycling">upcycling</a> efforts. The <a href="page.php?w=World_Steel_Association">World Steel Association</a> (WSA) estimates that 600&nbsp;kg of co-materials (co-products and by-products; about 90 <a href="page.php?w=Mass_fraction_%28chemistry%29">wt%</a> is slags) are generated per <a href="page.php?w=tonne">tonne</a> of steel produced.</p>

<p><big>Composition</big></p>
<p>Slag is usually a mixture of metal <a href="page.php?w=oxide">oxide</a>s and <a href="page.php?w=silicon_dioxide">silicon dioxide</a>. However,</p><p>
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