Stable ferric arsenate precipitation from acid copper...

C - Chemistry – Metallurgy – 22 – B

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Details

C22B 30/04 (2006.01) C01G 28/02 (2006.01) C01G 49/00 (2006.01) C22B 3/44 (2006.01) C22B 15/14 (2006.01)

Patent

CA 2384664

A method of which includes the steps of introducing an acidic solution containing arsenic(V), copper, ferric iron and ferrous iron into a first tank of a series of continuously stirred tank reactors and, in the first tank, adding air to the solution; heating the solution to an elevated temperature; recycling a portion of selectively precipitated ferric arsenate compounds to the said first tank; and seeding the solution with ferric arsenate compounds.

Cette invention concerne un procédé consistant à :introduire une solution acide renfermant de l'arsenic(V), du cuivre, du fer ferreux et du fer ferrique dans un premier réservoir d'une série de réacteurs a réservoir en agitation constante et, dans ce premier réservoir, à ajouter de l'air à la solution; à chauffer la solution à une température élevée; à recycler une partie des composés d'arséniate ferrique précipités sélectivement vers le premier réservoir; et à ensemencer la solution avec des composés d'arséniate ferrique.

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