Effect of basicity on compression strength and mineral composition of iron ore pellets
The effects of roasting temperature and basicity of pellets on compression strength of pellets were investigated by roasting experiments using horizontal tube furnace.The effect of pellets basicity,including natural basicity,0.4,0.6,0.8,and 1.0,on the mineral composition of pellets were analyzed by using SEM-EDS techniques.The possible generators of Fe2O3-SiO2-CaO system were calculated using FactSage software,and the above experimental results were analyzed and verified in combination with phase diagrams.The results show that for the pellets with basicity of 0.3-1.2,the compressive strength showes an obvious increasing trend with the increase of basicity,and a small amount of calcium-containing silicate minerals are firstly generated during the roasting of low-basicity pellet,and then calcium silicate minerals and calcium ferrate-based minerals are further generated during the roasting as the pellets basicity increased.
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