Research on Influence of Flux Characteristics on Properties of Alkaline Pellets
In this paper, dolomite, limestone, quicklime, slaked lime and forsterite are added to carry out pelletizing experiments to explore the influence of flux characteristics on the properties of alkaline pellets. By comparing the effects of different flux types on pellets, it is found that quicklime has high binary alkalinity value and the best ability to adjust alkalinity, which significantly improves the drop strength of the pellets. While the compressive strength of green pellets is improved greatly by adding limestone, and the impact on the bursting temperature of green pellets is small. From the comprehensive index of green pellets, limestone is better as the flux. The influence of flux particle size on pellet properties is studied with a fixed limestone dosage of 4％. It is found that when the proportion of -0.074mm particle size in limestone increases from 31.37％ to 94.25％, the drop strength of green pellets increases by 50％ on average, and the compressive strength of green pellets increases by 22.5％ on average, and the compressive strength of finished pellets increases obviously at first and then decreases slightly. Compared with limestone from different producing areas, the influence of chemical composition on pellet strength is investigated. It is found that the ratio of CaO to SiO2 had a great influence on the compressive strength of finished pellets. Under the condition of fixed limestone dosage, when the ratio of CaO/SiO2 is high, the SiO2 content is low, the liquid of calcium silicate produced is less, which is not conducive to high -temperature conglomeration, and the strength of the finished pellets is low; When the ratio of CaO/SiO2 is low, the SiO2 content is high, and there is an increase in low melting point substances on the surface, which will hinder the continuous conglomeration reaction and reduce the strength of the finished pellets.
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维普
