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％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.

主要回收金属矿物铌铁矿、细晶石、易解石、黑钨矿、白钨矿，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.

气候条件下，含多金属硫物钨锰-白钨矿矿床会产主一系列物理、学变，形成次生富集钨矿床。