By John N Hryn; Minerals, Metals and Materials Society. Magnesium Committee,; TMS Reactive Metals Committee,; Minerals, Metals and Materials Society. Meeting
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Additional resources for Magnesium Technology 2001 : proceedings of the symposium
The work of Cashion 03 ' also showed that SF6 had some residual effect in the metal. Heating of magnesium that had been cast under SF6 to 400°C was shown to release fluorine-bearing species to the surface of the metal. However, in situations where molten magnesium has been exposed to ambient This effect is at times remarkable to observe. Further detailed work is required to determine the mechanism for this protective effect. When the residual effect was first noticed, the immediate reaction was to question the impact on the mechanical properties of the alloy and its corrosion resistance.
This process was very inefficient, using as much as 25% makeup magnesium and 30% makeup chlorine to keep the process balanced. In 1993, however, TIMET entered into an agreement with TOHO Titanium Co. to purchase and install a 9,000 metric tonne per year Vacuum Distillation process at the Henderson plant. As a result of this new technology, material losses in the plant have fallen dramatically. Currently, the process requires only 6% makeup magnesium and 18% makeup chlorine. TiCl^D + 2Mg(1) -* Ti(s) + 2MgCl12(1) : The molten magnesium chloride (MgCl2) byproduct is then fed to a series of electrolytic cells.
If the sponge plant production rate is required to slow down, magnesium metal is cast into 1,000-kg. ingots and stored. The high nickel content of some of the magnesium ingot precludes it from sale. Alternatively, the magnesium is reintroduced to the sponge process at a later time; it is melted and converted back to magnesium chloride via the titanium reduction. This is then electrolyzed, starting the recycling process over again. No cost penalty is taken since the material is eventually consumed in the process.
Magnesium Technology 2001 : proceedings of the symposium by John N Hryn; Minerals, Metals and Materials Society. Magnesium Committee,; TMS Reactive Metals Committee,; Minerals, Metals and Materials Society. Meeting