Abstract：The research object of laterite nickel ore from Indonesia belonged to limonite-type laterite nickel ore, which had the characteristics of low grade and complex composition. In order to find out the microstructure characteristics of laterite nickel ore from Indonesia and to reasonably recover the components of nickel and iron in ore to the maximum extent, the phase composition of raw ore and the imbedding characteristics of main minerals were studied by means of polarizing microscope, scanning electron microscope (SEM), X-ray diffraction (XRD) and mineral liberation analyzer (MLA). The results showed that this limonite laterite nickel ore underwent the dehydrogenation process from goethite to hematite and formation process of iron peridotite phase within the temperature gradient range of 100-900℃. The metal minerals in this laterite nickel ore from Indonesia was mainly composed of goethite, chromite, hematite and other oxides, while the gangue minerals were mainly composed of silicates such as quartz, forsterite and chlorite. The goethite was the main occurrence mineral of Ni, Cr, CO and Al, and it was a solid solution mineral formed in the form of isomorphism instead of Fe element. This ore was also the target mineral for the separation of nickel and iron in the later stage.
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