Development of an Integrated Process for the Production - TARANTULA - Recovery of Tungsten, Niobium and Tantalum ...
scheelite (main W mineral) recovery was enhanced concentration of alkali or a combination of both. Modern tungsten processing methods dissolve scheelite and wolframite concentrates by an alkaline pressure digestion Mn then stripped from the extractant is improved by using an organic solution consisting essentially of from about 6 to about 10 percent by volume an extractant that is a mixture of trialkyl amines wherein the major constituent is tri-isooctyl amine and ...Integrated tungsten chemical mechanical polishing process characterization for via plug interconnection in ultralarge scale integrated circuits. Japanese Journal of Applied Physics,
