| Preparation of Scandium-Bearing Master Alloys by Aluminum-Magnesium Thermoreduction |
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| 作者姓名： | 姜锋 白兰 尹志民 |
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| 作者单位： | InstituteofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China |
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| 基金项目： | ProjectsupportedbytheNationalKeyFundamentalResearchDevelopmentProgram (G1 99990 6 491 1 )，ChinaScholarship
Council，andtheNationalNaturalScienceandFoundationofChina ( 59874 0 3 2 ) |
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| 摘 要： | The new preparation method of scandium-bearing master alloys, in which scandium oxide was fluorinated by reaction with NH4HF2 and then reduced by aluminum-magnesium in fused salt containing alkali and alkaline fluoride under atmosphere, was studied. The effect of sorts of metallic reductive and technique conditions such as reducing temperature and time on the recovery of Sc was discussed. When the liquid aluminum-magnesium was used as the reductive agent, the all-recovery exceeds 80% and the concentration of Sc in master alloy prepared exceeds 1.9%. The best reducing reaction temperature and time are 1100 K and 40 rain respectively. The newly produced Sc from reduction combines with A1 to produce the stable compound Al3Sc, so the reduction progress is sustained and the recovery of Sc is increased.
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| 关 键 词： | 轴承合金 稀土 合金化 铝镁合金 铝热法 制备 钪 |
Preparation of Scandium-Bearing Master Alloys by Aluminum-Magnesium Thermoreduction |
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| Jiang Feng,Bai Lan,Yin Zhimin.Preparation of Scandium-Bearing Master Alloys by Aluminum-Magnesium Thermoreduction[J].Journal of Rare Earths,2002,20(5):507-511. |
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| Authors: | Jiang Feng Bai Lan Yin Zhimin |
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| Abstract: | The new preparation method of scandium bearing master alloys, in which scandium oxide was fluorinated by reaction with NH 4HF 2 and then reduced by aluminum magnesium in fused salt containing alkali and alkaline fluoride under atmosphere, was studied. The effect of sorts of metallic reductive and technique conditions such as reducing temperature and time on the recovery of Sc was discussed. When the liquid aluminum magnesium was used as the reductive agent, the all recovery exceeds 80% and the concentration of Sc in master alloy prepared exceeds 1.9%. The best reducing reaction temperature and time are 1100 K and 40 min respectively. The newly produced Sc from reduction combines with Al to produce the stable compound Al 3Sc, so the reduction progress is sustained and the recovery of Sc is increased. |
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| Keywords: | rare earths Sc bearing master alloys metallic thermoreduction scandium oxide |
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