The difference lies in whether we roast the ore in excess air or calcine in limited air, driving off sulfur or carbon dioxide. For sulfide ores like zinc blende, roasting is used, while carbonate ores like limestone undergo calcination. My work in environmental engineering compels me to say the real difference is the cost of scrubbing that SO₂ from the roaster's exhaust—it makes my pension seem like a handful of *phandar*! It reminds me why I fret over new spectacles; clear vision shows us the true price of extraction.
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