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18 Inch Diameter Ductile Iron Sewer Pipe – 1970′s attached with Pipe Restraints to Federal Flood Control Structure
The large line was installed above ground due to limited space in the ground with numerous other utilities storm drains, water, gas, electric, telephone, cable to name a few.
J. Scott Shipe produced this video for educational purposes questions email Scott at firstname.lastname@example.org
Aluminium, oxygen (from air), and high temperature together cause the formation of aluminium oxide on the surface of the melt. This is known as “dross”, it looks like beverage foam, and contains the impurities from the original scrap. Fluxing flushes out impurities from the melt pool to the dross, and aluminium from the dross to the melt pool.
Many substance can work as flux. Here, I use saw dust. The carbon from the wood fibers combines with the oxygen from the aluminium oxide, which helps to recuperate some aluminium. There is also a general effect of agglomeration, which eases spooning out of the dross.
Removing dross as I’m doing in this video leaves a beautiful, shiny pool of high purety aluminium.