Solidification/stabilisation of arsenic bearing fly ash from the metallurgical industry. Immobilisation mechanism of arsenic.

摘要: When a fly ash waste material from copper refining process containing large amounts of As2O3 is solidified using cement and lime, the arsenic concentration in leachate can be lowered to ca. 5 mg/l saturated solution Ca(OH)2. It shown that decrease leachate, mainly As(III), due formation insoluble CaHAsO3 presence This method compared with whereby use made oxidation before solidification oxidise As(III) As(V) H2O2. The extraction test an oxidised S/S sample was 0.5 mg/l, factor 10 below one for non-oxidised sample. Ca3(AsO4)2 Extensive speciation program MINTEQA2, clarify immobilisation arsenic.