Method of treating arsenic-containing solution

C - Chemistry – Metallurgy – 01 – G

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C01G 49/00 (2006.01) B01D 9/02 (2006.01) B09B 3/00 (2006.01) C02F 1/58 (2006.01) C02F 1/72 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 30/04 (2006.01)

Patent

CA 2648869

A method of treating an arsenic-containing solution, such as an arsenic-containing solution of high purity and high concentration obtained by treating an arsenic-containing substance wherein various elements other than arsenic are contained, for example, a smelting intermediate occurring in nonferrous smelting to thereby attain recovery as powder of a compound of iron and arsenic exhibiting very low arsenic elution concentration. Ferrous ions are added to a solution containing 10 g/L or more of arsenic so as to adjust the molar ratio of iron to arsenic (Fe/As) in the solution to 1 or higher. An oxidizer is added thereto, and while agitating the same, reaction is carried out at 70°C or above. Thereafter, solid-liquid separation is carried out, and obtained solid contents are dried.

La présente invention concerne un procédé de traitement d'une solution contenant de l'arsenic, telle qu'une solution contenant de l'arsenic de grande pureté et de concentration élevée obtenue en traitant une substance contenant de l'arsenic contenant divers éléments autres que l'arsenic, par exemple, un intermédiaire de fusion rencontré lors d'une fusion non ferreuse de façon à récupérer de ce fait sous la forme d'une poudre un composé à base de fer et d'arsenic présentant une très faible concentration d'élution d'arsenic. Des ions ferreux sont ajoutés à une solution contenant 10 g/l ou plus d'arsenic de façon à ajuster le rapport molaire du fer sur l'arsenic (Fe/As) dans la solution à une valeur supérieure ou égale à 1. On ajoute un oxydant à la solution tandis que celle-ci est agitée, et on effectue la réaction à une température supérieure ou égale à 70 °C. On effectue ensuite la séparation solide/liquide et on sèche la matière solide obtenue.

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