Studies on calcium reduction of yttrium fluoride
TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION C-MINERAL PROCESSING AND EXTRACTIVE METALLURGY(2016)
摘要
The reduction of yttrium fluoride (YF3) by calcium in a molybdenum crucible was investigated. A visual observation technique was used to monitor the reduction process. It was observed that the reaction initiated immediately after the melting of calcium. Based on the results, a two-step reduction sequence was attempted. First, the charge was heated to 950 degrees C to minimise the calcium loss by vaporisation and to ensure completion of reaction. The products were then fast heated to 1600 degrees C for slag/metal separation. Molybdenum content of yttrium was found to be in a range of 3.5-4.75 wt-%, which is much lower than the equilibrium content predicted by Mo-Y phase diagram. The yttrium/molybdenum interface was studied using an electron probe microanalyser, which confirmed that the overall equilibrium was not reached, indicating the possibility of lowering the molybdenum contamination further by process optimisation.
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关键词
Yttrium metal,Rare earth metals,Fluoride reduction,Calciothermic reduction,Container problem
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