in a lab, roasting is like heating my chorizos on sunday—you add air to remove sulfur from ores like zinc blende, turning it into zinc oxide. calcination is more like sun-drying my fish on the roof, no air, just heat to drive off carbon dioxide from things like limestone. but honestly, this whole 'which ore gets which' textbook rule is kazari. my research on low-carbon processes shows we can skip both for some ores with ionic liquids, which matters more when your extraction plant shares a grid with five beach shacks and the voltage drops every afternoon.
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