METHOD OF PRODUCING AMMONIUM PARATUNGSTATE Russian patent published in 2016 - IPC C22B34/36 C01G41/00 C22B3/04 C22B3/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing ammonium paratungstate from tungsten concentrate. Method includes autoclave soda leaching of tungsten concentrate, regeneration of soda solution and returning thereof for leaching, concentration of tungsten by ion exchange on solid anionite, regenerating anionite by desorption and obtaining ammonium paratungstate from strippant. Ion exchange is carried out on anionite AV-17-8 in chloride form in two stages. At the first stage solution after leaching is directed for extraction of carbonate-ion into anionite phase, and from anionite phase into regenerated soda solution, directed for autoclave leaching. Then carbonate ion-depleted solution is taken for extraction of tungstate ion into anionite phase, and from anionite phase into aqueous solution, suitable for crystallisation of ammonium paratungstate.

EFFECT: technical result is extraction of tungsten from tungsten concentrate with high degree of extraction, few steps, possibility of regenerating an opening reagent, absence of inflammable organic substances, simple implementation.

1 cl, 1 dwg, 1 ex