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

萃取法从钨矿渣制得纯度为99．99％的。

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.

要为收钨，钨灰与碳酸钠在0．1MVA电炉内进行了收试验，制成粗钨酸钠。