Tungsten Products - Ammonium Paratungstate (APT)

Ammonium Paratungstate (NH4)[H2W12042J,4H20 is the most important precursor for the majority of tungsten products. Exceptions are only product s of melting metallurgy and Menstrum WC produce d directly from ore concentrates.

All other intermediates such as tungsten trioxide, tungsten blue oxide, tungstic acid and ammonium metatungstate ca n be derived from APT, either by thermal decomposition or chemical conversion.

APT is a white crystallized powder having average crystal size between 30 and 100 im, Especially crucial for the quality is the purity, Typical levels of todays commercial APT are (upper limits in pg/g): Al 1-7, As 5-10, Bi 0.5-1, Ca 1-10, C0 1-10, Cr 1-10, Cu 1-3, Fe 3-10, K 2-10; Mg l-7, Mn 1-10, M0 5-30, Na 5-10, Ni 1-7, P 5-7, Pb 1-5, S 5-7, Si 1-10, Sn 1-10, Ti 3-10, and U 3-10, APT is packaged in polyethylene-lined drums.

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