| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Process Metallurgy and Environmental Engineering: An EPD Symposium in Honor of Takashi Nakamura
|
| Presentation Title |
Synthesis of Scorodite from Iron(III) Oxide and As(V) Solution |
| Author(s) |
Etsuro Shibata, Ken Adachi, Atsushi Iizuka |
| On-Site Speaker (Planned) |
Etsuro Shibata |
| Abstract Scope |
The synthesis of scorodite (FeAsO4·2H2O) crystals in an As(V) solution using an iron(III) oxide, typically hematite (Fe2O3), is a promising method to stabilize arsenic in nonferrous smelting industries. Basically, hematite and arsenic acid (H3AsO4) in the solution react to form a gel-like precursor, which subsequently grows into scorodite crystals. However, the formation reaction hardly proceeds without Fe(II) in the solution. Also, the gel-like precursor is a compound similar to scorodite, but part of the iron constituting the precursor is Fe(II); thus, the Fe(II)/Fe(III) redox reaction is involved in the synthesis mechanism. Studies on the optimization of synthesis conditions and clarification of the synthesis mechanism were conducted not only via basic batch tests but also via experiments using the stable iron isotope and electrochemical measurements. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Hydrometallurgy, Process Technology, Environmental Effects |