TY - JOUR AU - Balladares, E. AU - González, A. AU - Parra, R. AU - Sánchez, M. PY - 2004/10/30 Y2 - 2024/03/28 TI - Fixing arsenic contained in a gas phase using solid hematite JF - Revista de Metalurgia JA - Rev. metal. VL - 40 IS - 5 SE - Articles DO - 10.3989/revmetalm.2004.v40.i5.293 UR - https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/293 SP - 384-388 AB - Feasibility to obtain ferric arsenate starting from arsenic containing gas in contact with Fe<sub>2</sub> O<sub>3</sub> has been studied. Thermodynamic stability of the system Fe-As-O was analysed in order to verify conditions to form Fe<sub>x</sub>As<sub>y</sub> y O<sub>z</sub> type compounds. Experiments were made using a hematite sample suspended in a thermogravimetric device. As<sub>4</sub>O<sub>6</sub> was generated starting from solid As<sub>2</sub> O<sub>3</sub> which was circulating through the iron oxide. Final samples were analysed chemically and by means of DRX, verifying the formation of FeAsO<sub>4</sub>, FeAsO<sub>4</sub>·2H<sub>2</sub>O and FeAsO<sub>4</sub>·(H<sub>2</sub>O)2 in small quantities. Tests in porous bed and pellets were carried out, studying the effect of: porosity, temperature and oxygen potential. The largest conversion obtained was 10 % at 800 °C, pO<sub>2</sub> =50% and porosity = 0.883. ER -