Tungsten Intermediates - 1. Ammonium Paratungstate (APT)

APT [(NH4)₁₀[H₂W₁₂0₄₂]•4H₂0] is the main intermediate and also the main tungsten raw material traded in the market. APT is usuaIIy calcined to yellow (W03) or blue oxide (W03-X; a slightly substoichimetric trioxide with varying oxygen content).

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