Producing Ammonium Paratungstate Hydrates

 Process for the continuous preparation of ammonium paratungstate hydrate directly in the reextraction of a tungsten-laden organic phase with an ammonia-containing aqueous solution in a mixer-settler apparatus, which comprises carrying out the reextraction at an NH3:W molar ratio of from 0.83 to 1.30, and a volume feed ratio of the tungsten-laden organic phase to the ammonia-containing aqueous solution of from 5 to 25 wherein the reextraction in the mixer is carried out so that a solids concentration of the ammonium paratungstate hydrate, based on the ammonia-containing aqueous phase in the mixer, of from 100 to 1200 g/l, is established and wherein the tungsten-laden organic phase and the ammonia-containing aqueous solution are introduced into a stirrer region of the mixer and in that that a three-phase mixture is formed and is taken off both from the upper region, via a free overflow, and from the stirrer region, of the mixer, so that a stationary ratio of tungsten-laden organic phase (OP) and ammonia-containing aqueous solution (AP) in a phase ratio (OP:AP) in the range from 1:5 to 1:70 is established in the mixer.

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