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.

主要回收的金属矿物钽铌铁矿、细晶石、钽易解石、黑钨矿、白钨矿，密大，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.

在湿气候条件，金属硫化物的钨锰-白钨矿矿床会产主一系列的物理、化学变化，形成次生富集钨矿床。