Cadmium Borotungstate

Cadmium borotungstate is a heavy white crystal, soluble in water and the solution is yellow or lilac, besides, it will break down in sunlight. Its chemical formula is Cd5 (BWl2O40) • 18H2O. On the other hand, it can be produced by the thermal reaction of tungsten trioxide, cadmium oxide and borax taken.
As below will introduce using extraction method to produce cadmium borotungstate:
1.Taking 396g Na2WO4H2O dissolved in 300ml water, besides, adding HCl with stirring and heated to 85 ℃, heat preservation for 1-2 hours, PH is maintained at about 3. Then added 18.2g H3BO3 maintained at 85 ℃ for 30 minutes, then add the acid to adjusted PH value to 2, maintained at 85℃ 3-4 hours, cooled and filtered. The filtrate contains 12-boron sodium tungstate.
2. The solution was concentrated placed in a separatory funnel and extracted by ether. At the same time, adding 2-3 volumes of 33% H2SO4 for three times, oscillating for 5 minute to layered, obtained third-phase of heavy oil shaped and then separated the bottom of the third phase. Adding a small amount of water to remove Et2O obtain tungstoboric acid.
3. Adding excess CdO to the tungstoboric acid solution, and then filtered to give claybank solution after concentrated, cooling and crystallized to give an off-white cadmium borotungstate.

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