Under the pressures of both the decrease of high-grade high-quality iron ore resources and the increase of raw material costs,the iron and steel enterprises in China turn to adopt iron ores which contain special elements such as nickel,manganese,etc.in the sintering blend.Analytical reagents were used for sintering experiments,and the sinters were analyzed with X-ray diffraction,scanning electron microscopy and mineralogical microscopy to study the effect of nickel on the silico-ferrite of calcium and aluminum(SFCA)bonding phase formation during sintering.The results indicated that SFCA was divided into nickel-containing and nickel-free areas due to the presence of nickel.The increasing content of nickel would greatly reduce the content of SFCA and promote the formation of calcium aluminum silicate.A great deal of Fe2O3 participated in the crystal transition to Fe3O4,reducing the amount of Fe2O3 involved in the formation of calcium ferrite.When the blending ratio of NiO,which is used to provide the nickel in the sintering process,is less than 3%,the calcium ferrite is in substantially interleaving corrosion with hematite and magnetite.Both the porosity and silicate glass phase content are low,which contributes to the sintering production. Under the pressures of both the decrease of high-grade high-quality iron ore resources and the increase of raw material costs, the iron and steel enterprises in China turn to adopt iron ores which contain special elements such as nickel, manganese, etc.in the sintering blend. Analytical reagents were used for sintering experiments, and the sinters were analyzed with X-ray diffraction, scanning electron microscopy and mineralogical microscopy to study the effect of nickel on the silico-ferrite of calcium and aluminum (SFCA) bonding phase formation during sintering. These results indicated that SFCA was divided into nickel-containing and nickel-free areas due to the presence of nickel. increasing greater of the content of nickel would greatly reduce the content of SFCA and promote the formation of calcium aluminum silicate. A great deal of Fe2O3 participated in the crystal transition to Fe3O4, reducing the amount of Fe2O3 involved in the formation of calcium ferrite. When the blending ratio of NiO, which is used t o provide the nickel in the sintering process, is less than 3%, the calcium ferrite is in substantially interleaving corrosion with hematite and magnetite.Both the porosity and silicate glass phase content are low, which contributes to the sintering production.