Iron arsenate powder

Details Iron arsenate powder Iron arsenate powder

2008-08-22

2011-12-13

Bos, Steven (Department: 1736)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S087000

Reexamination Certificate

active

08075868

ABSTRACT:
There is provided an iron arsenate powder which is produced from an arsenic containing solution and wherein the concentration of arsenic eluted or released from the powder is very low. The iron arsenate powder is a powder of dihydrate of iron arsenate, which has a crystal structure of rhombic system and which has lattice constants of a=0.8950 to 0.8956 nm, b=1.0321 to 1.0326 nm and c=1.0042 to 1.0050 nm at room temperatures and atmospheric pressure. The iron arsenate powder can be produced by a method comprising the steps of: adding ferrous ions to an arsenic containing solution to cause the molar ratio (Fe/As) of iron to arsenic in the solution to be not lower than 1; adding an oxidizing agent to the solution; heating the solution to a temperature of not lower than 70° C. while stirring the solution, to allow a reaction; and carrying out a solid-liquid separation to wash the obtained solid part.

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Droppert, et al. “Ambient pressure production of crystalline scorodite from arsenic-rich metallurgical effluent solutions” Feb. 1996, pp. 227-239, Min. Metals & Materials Society, EPD Congress.
E. Krause et al.; “Solubilities and Stabilities of Ferric Arsenate Compounds”; Hydrometallurgy, vol. 22, 1989, pp. 311-337; XP002615158, Elsevier Science Publishers B.V., Amsterdam.

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