As a result of high specific gravity from the tungsten minerals, they are amenable to gravity concentration methods. However, the fine dissemination with the ore minerals inside the gangue usually makes fine grinding necessary, as well as at least some flotation concentration for that recovery from the finer sizes. The buzz continues to be toward all-flotation recovery with gravity processes getting used only as a way of upgrading an integral part of the concentrates.
If the ore contains pyrite or other sulfides, a basic sulfide flotation stage is normally employed ahead of both tabling and flotation of the tungsten. The low cost and high collecting power of xanthates ensures they are the favored collector because of this sulfide float. Soda ash or sulfuric acid is normally added for pH control. Acid is frequently preferred for all those ores containing pyrrhotite. However, its use with calcite gangue ores can lead to the formation of calcium sulfate, which may float with and dilute the next tungsten flotation concentrate.

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