Films in before processing, you should use iodin tungstenic ultrared warming up.
冷膜在处理前，应先用碘钨红外线预热。
2
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。
3
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.