“…1-3 (Rhamdhani et al, 2009a,b). Depending on the starting laterite ore, the calcine (~43 µm) is coarser than the feed (~21 µm); (particle sizes quoted are average P 80 values and are relevant to the Yabulu refinery) (Rhamdhani et al, 2009a,b); it consists of a mixture of α-Fe, Ni x Fe (1-x) , FeO, NiO, Fe 3 O 4 , NiFe 2 O 4 or (Fe,Ni) 3 O 4 with Fe-Ni alloy nanoparticles (taenite, 15-20 nm) interspersed in porous magnetite (Canterford, 1978;De Graaf, 1979, 1980Richardson et al, 1981;Chander and Sharma, 1981). The majority of iron forms Fe 3 O 4 during roasting with about 20% of iron reduced to the alloy (Fittock, 2007).…”