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Lava isn't even really that hot though (most active volcanos on Earth are around 750-950 Celsius). Even us humans now have the ability to build things that could withstand those temperatures; it is just very expensive and has very few practical purposes. A space shuttle has to endure higher temperatures during atmospheric reentry (around 1600 Celsius).
It's possible that naturally occuring naquadah is similar to uranium, where the raw ore that you mine can be less than 1% of the actual element. Melting away the impurities could just be part of the process of refining the raw naquadah ore into weapons grade naquadah? It might not necessarily be the only way to refine naquadah but it could get the job done without having to give your slaves access to advanced technology.
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