Porous iron oxide and method for producing the same and method for treating solutions
AssigneeDowa Metals & Minning Co., Ltd.
InventorsTetsuo Fujita, Ryoichi Taguchi, Hisashi Kubo
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Abstract
To provide a recovery agent for recovering arsenic, fluorine, lead, and selenium from a solution containing environmentally hazardous substances including arsenic and fluorine. A porous iron oxide having a particle size of 10 to 100 μm and a specific surface area of 50 m2/g or larger determined by three-point BET method is introduced into a solution containing the environmentally hazardous substances. Alternatively, a solution containing the environmentally hazardous substances is passed through a column filled with the porous iron oxide. Thus, the environmentally hazardous substances are recovered from the solution.
Claims9
A porous iron oxide, having a particle size of 10 μm or more and 100 μm or less, with a specific surface area measured by a nitrogen gas adsorption method set to be 50 m2/g or more.
A method for producing a porous iron oxide, comprising the steps of:
- adding a divalent iron ion to an arsenic-containing solution, then adding an oxidant, stirring, and heating the solution, with a molar ratio of iron/arsenic (Fe/As) in this solution set to be 1 or more, and thereafter subjecting this solution to solid/liquid separation, to thereby obtain a solid matter;
- obtaining a slurry by charging this solid matter into an alkaline solution;
- and
- subjecting this slurry to solid/liquid separation, to thereby obtain a porous iron oxide.
Dependencies are inferred from the claim text.