A long time ago ,I work on and aluminum smelter that used and old cement truck can as a rotary furnace and a burner out of a ships boiler burning used oil as fuel. The can was lined with refractory brick. We could produce 3 500# ingots in and 8 hour shift. We mostley melted dross and automotive scrap and loaded the furnace by hand. I got a real surprise one day when I threw in a peice of magnesium
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