Method of producing iron-arsenic compound excellent in...

Details Method of producing iron-arsenic compound excellent in... Method of producing iron-arsenic compound excellent in...

C - Chemistry, Metallurgy

01

G

C01G 49/00 (2006.01) C02F 1/58 (2006.01) C22B 3/44 (2006.01)

Patent

CA 2663108

A process for producing an iron arsenide compound, comprising adding an oxidizer to an aqueous solution containing arsenide ions and ferrous ions wherein the arsenic concentration is 15 g/L or higher, agitating the solution so as to advance a precipitation reaction of iron arsenide compound and terminating the precipitation when the pH value of the solution is in the range of 0 to 1.2.When the arsenic concentration of the solution before reaction is 25 g/L or higher, the reaction can be terminated when the pH value of the solution is in the range of ~(minus) 0.45 to 1.2. It is preferred that the pH value of the solution before reaction range from over 0 to 2Ø For example, sulfuric salts can be used as the ferrous ion source.

L'invention concerne un procédé de fabrication d'un composé arséniure de fer, comprenant les opérations consistant à ajouter un oxydant à une solution aqueuse contenant des ions arséniure et des ions ferreux, la concentration en arsenic étant de 15 g/l ou plus, à agiter la solution de façon à faire progresser une réaction de précipitation de composé arséniure de fer et terminer la précipitation lorsque la valeur de pH de la solution se situe dans la plage de 0 à 1,2. Lorsque la concentration en arsenic de la solution avant la réaction est de 25 g/l ou plus, la réaction peut être terminée lorsque la valeur de pH de la solution se situe dans la plage de - (moins) 0,45 à 1,2. On préfère que la valeur de pH de la solution avant la réaction se situe dans la plage de plus de 0 à 2,0. Par exemple, des sels sulfuriques peuvent être utilisés comme source d'ions ferreux.

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