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Process for the Preparation of Rare-earth-silicon Alloys.
U S Pat 4 135 921 1979 Jan; :
Silicon alloys high in rare-earth metals and useful in steelmaking are prepared by reacting rare-earth metal compounds, a silicon source, al, cao slag former, and optionally, mgo. Rare-earth metal recoveries are at least 85 pct, compared with no more than 60 pct by a conventional smelting method in a carbon-arc furnace. Thus ferrosilicon 132, rare-earth metal oxide ore 227, al 68.5, Cao 263, and mgo 24 g were induction melted in a silicon carbide crucible for 30 min at 1,600 deg c. After slag removal, the alloy analyzed re metal 46, si 46, fe 8.9, Al 32, and p 0.05 Wt pct. Rare-earth metal recovery was 91.5 pct. Chem. Abstr. 90:125,180Y rare-earth metal-silicon alloys useful in steelmaking are prepared by reacting re metal compounds, si, and al in the presence of cao. Thus, fesi 132, re2o3 ore 227, al 68.5, Cao 263, and mgo 24 g were reacted and melted 0.5 H at 1,600 deg c in a sic crucible. The resulting alloy phase analyzed re metal 46.0, Si 46.0, Fe 8.9, Al 3.2, and p 0.05 Wt pct. Rare- earth metal recovery was 91.5 pct, compared with no more than 60 pct by conventional smelting.
U.S. Pat, 4,135,921; Jan. 23, 1979; Chem. Abstr. 90:125,153S (See Also Chem. Abst. 90:125,180Y)
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