Patent ID: 8216533
Filing Date: 2012-07-10
Classification: C01G,C01P,Y10T

Abstract:
1. A 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 NH 3 :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 which further comprises a stirrer and wherein the stirrer speed in the mixer is set so that an inhomogeneous distribution of organic phase and ammonia-containing aqueous phase is obtained in the mixer.