1. The purity 99.99% of scandium oxide(Sc 2O 3) was prepared from tungstenic slag with extraction process.
   用萃取法从钨矿渣制得纯度为99．99％的氧化钪。
2. In order to recover the tungstenic dust, sodium carbonate was added to it and smelting test was carried out in a 0. 1MVA electric arc furnace.
   要为回收钨尘，利用钨尘灰与碳酸钠在0．1MVA电炉内进行了回收试验，制成粗钨酸钠。

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