Thermal reduction process for production of magnesium

Details Thermal reduction process for production of magnesium Thermal reduction process for production of magnesium

C - Chemistry, Metallurgy

22

B

53/265

C22B 26/22 (2006.01)

Patent

CA 1220348

Abstract Magnesium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to this process, a reducing agent containing ferrosilicon and at least 25 wt.% aluminum is contacted in the reaction zone with a calcium-silicon-aluminum- magnesium oxide slag to produce magnesium vapor. The magnesium vapor is transported from the reaction zone to the condensation zone and condensed therein. The slag is maintained so contain from 1 to 8 wt.% MgO, at least 9 wt.% A12O3, and have a CaO/ SiO2 weight ratio no less than that provided by the formula 2.1 + .03 (wt.% A12O3 - 9) The slag is also maintained so as to decrepitate upon cooling.

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