Ammonium Metatungstate Producing Method

ammonium metatungstate photo

Ammonium metatungstate producing method includes neutralization method, tungstic acid method, thermal decomposition method, solvent extraction method and ion exchange method.

Neutralization method uses secondary ammonium metatungstate and nitrate as the raw material to produce metatungstate.

Tungstic acid method using ammonia tungstate tungstic acid dissolved, add a boil deionized water in the stirring, heating by ammonia, Ph=8, in the boiling solution by adding acetic acid.

Thermal decomposition method combines ammonium paratungstate and a small amount of citric acid catalyst after mixing into the far infrared, rotary furnace, controlled thermal decomposition temperature 200 ～ 280 ℃, decomposition of about 1 h.

Solvent extraction using ammonium tungstate solution and organic extractant phosphoric acid: two (2- ethylhexyl) ester (D2EHPA) or phosphoric acid butyl ester three (TBP) and kerosene solvent to form organic phase, extract ammonium ion from ammonium tungstate solution.

Ion exchange method uses ammonium paratungstate as raw material, heating ammonium paratungstate from 1 to 8 h at 130 ~ 140 ℃, the resultant tune into a paste, to 80 ~ 100 ℃ boiling for 2 ~ 6 h, generates ammonium metatungstate solution. And then obtain the product through concentrating crystallization, filtration and drying.

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