i have seen on some metal casting sights, and some books about melting aluminum, those guys had a crucible to melt in and the heat source had a small squirrel cage blower. from what little ive read control of the air flow helps keep down the oxidation. Then again these guys were casting parts,they could find,or couldnt afford,or just wanted to exsperiment in case TSHTF. So it might not be affordable if the yield is small.I did know of one local guy had a old butane tank fitted with grates and a drain channel,had burners mounted inside. he would throw all his cast, and the above mentioned rotors in there and make aluminum bricks. But he was moving a lot of material,and this was in the day when butane or propane, honestly not sure which he used it was way cheaper think it was maybe 25 years ago. After he melted off the alum, he let it cool and raked out the iron,but i noticed last time i saw it his rig was rusting away in the fence row, probably not profitable any more
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