Fixing arsenic contained in a gas phase using solid hematite
Keywords:Arsenic fixation, environmental contamination, ferric arsenate, smelting
Feasibility to obtain ferric arsenate starting from arsenic containing gas in contact with Fe2 O3 has been studied. Thermodynamic stability of the system Fe-As-O was analysed in order to verify conditions to form FexAsy y Oz type compounds. Experiments were made using a hematite sample suspended in a thermogravimetric device. As4O6 was generated starting from solid As2 O3 which was circulating through the iron oxide. Final samples were analysed chemically and by means of DRX, verifying the formation of FeAsO4, FeAsO4·2H2O and FeAsO4·(H2O)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, pO2 =50% and porosity = 0.883.
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