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

主要收的金属矿物钽铌铁矿、细晶石、钽易解石、黑钨矿、白钨矿，密度比，般为5~7。