State of the art on the recovery of refractory metals from secondary .
3 Mineral/waste processing of secondary tungsten resources . . 4 Extractive metallurgy for Tungsten from secondary resources . .. hydrocyclone and spiral. .. POX method is becoming more popular due to its environmental friendliness.
Scheelite: The mineral scheelite information and pictures
Scheelite is an important ore mineral, and is well known among collectors for its distinctly colored crystals . Popularity (1 4), 2 . Nova Lima, Minas Gerais, Brazil; and extremely large crystals were found in the Turmalina Mine, Piura, Peru.