Magnesium production
AssigneeJohannesburg Consolidated Investment Company Limited
InventorsJohannes J. Bodenstein, Leslie J. Farrell
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Abstract
Magnesium is recovered from a slag produced in a pyrometallurgical process and which contains magnesium oxide and other oxides. The slag is delivered, preferably in a hot state, to a reduction stage where the magnesium oxide is reduced and the magnesium vaporized. The reductant includes an alkaline earth metal in non-oxidic form, preferably calcium carbide. The vaporized magnesium is delivered to a condenser where it is condensed directly from the vapor state to a powder form.
Claims12
A method of recovering magnesium values from a material containing oxides of magnesium, chromium, aluminum, silicon, iron, and calcium, including the steps of delivering said material and reductant to a reduction stage, said reductant including an alkaline earth metal carbide, heating said material and reductant in said reduction stage in an inert atmosphere to reduce the magnesium oxide and produce vaporized magnesium, feeding vaporized magnesium to a condenser and converting the vaporized magnesium directly to a powder form in said condenser.
Dependencies are inferred from the claim text.