It is very significant extracting niobium, tantalum from tungstenic slag. The extraction method and the computational formula of it are given out in this paper.
从钨矿渣中提取铌、钽具有重要的意义。本文给出了提取方法及相应的计算公式。
The purity 99.99% of scandium oxide (sc 2o 3) was prepared from tungstenic slag with extraction process.