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

用萃取法渣制得纯度为99．99％的氧化钪。

The major metal minerals recycled include tantalum niobite, fine spar, tantalum aeschynite, wolframite and scheelite, which have large density of generally 5 to 7.

主要回收的物铌铁、细晶石、易解石、黑、白，密度比较大，一般为5~7。

Under hygrothermal climate, a series of physicochemical changes take place on huebnerite-scheelite deposit,containing polymetallic sulphi-des and slich a deposit forms a secondary tungsten deposit.

在温湿气候条件下，含硫化物的锰-白床会产主一系列的物理、化学变化，形成次生富集床。