The purity 99.99% of scandium oxide(Sc 2O 3) was prepared from tungstenic slag with extraction process.

用萃取法从矿渣制得纯度99．99％的氧化。

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.

，利用灰与碳酸钠在0．1MVA电炉内进行了试验，制成粗酸钠。