Rückgewinnung von Antimon und Wismut aus Arsen Enthaltenden Sauren Wässrigen Lösungen

Details

Veröffentlichungs-Nr.

EP4379074

Aktenzeichen

EP22383179

Anmeldetag

2. Dezember 2022

Veröffentlichung

5. Juni 2024

Rechtsraum

EP

IPC

C22B3/42C22B15/00C22B30/02C22B30/04C22B30/06

Abstract

The invention relates to a method for separating antimony and bismuth from an arsenic-containing acidic aqueous solution, wherein the initial pH of the acidic aqueous solution is equal to or less than -0.40, and wherein the method comprises the steps of (a) contacting the acidic aqueous solution comprising arsenic, antimony and bismuth with a reducing agent in a sufficient amount to reduce As(V) to As(lll) and to reduce Sb(V) to Sb(III); (b) contacting the reduced acidic aqueous solution of step (a) with a first alkaline reagent to raise the pH of the acidic aqueous solution to a value within the range of 0.5-1.5, wherein antimony precipitates, and wherein bismuth and arsenic remain in the acidic aqueous solution; (c) separating the antimony precipitate from the acidic aqueous solution comprising bismuth and arsenic; (d) contacting the acidic aqueous solution comprising bismuth and arsenic of step (c) with a second alkaline reagent to raise the pH of the acidic aqueous solution to a value within the range of 2.0-3.0, wherein bismuth precipitates, and wherein arsenic remains in the acidic aqueous solution; and (e) separating the bismuth precipitate from the acidic aqueous solution comprising arsenic.

Anmelder

Firmen

Universitat Politècnica De Catalunya
Consejo Superior de Investigaciones Científicas (CSIC)

Land

🇪🇸 Spanien

Fachgebiete