40 Processing of metal, scrap metal and alloys, namely, refining, recycling, remelting, and treatment of metal, scrap metal and alloys; processing of aluminum, scrap aluminum and aluminum alloys, namely, refining, recycling, remelting, and treatment of aluminum, scrap aluminum and aluminum alloys; refining of metal, scrap metal and alloys, namely, purifying metal, scrap metal and alloys; refining of aluminum, scrap aluminum and aluminum alloys, namely, purifying aluminum, scrap aluminum and aluminum alloys