Study on the Effect of Basicity on the Densification Behavior of Sinter

In order to quantitatively analyze the coalescence behavior in the sintering process, the thermodynamic software FactSage is used to calculate the composition and properties of the melt under different basicity conditions. According to the calculation results, the surface tension and apparent viscosity of the melt under various conditions are obtained, which are used to calculate the densification coefficient of sinter. The results show that as the basicity increases, the apparent viscosity of the melt continues to decrease, and the calculated minimum value is 0.114 Pa·s at a temperature of 1350℃. The surface tension first decreases and then increases with the increase in basicity, and has a minimum value at a temperature of 1300℃, which is about 0.32 N. The coalescence behavior of sinter is driven by the apparent viscosity and surface tension. Increasing basicity is beneficial to the coalescence behavior of the sintering process and makes the densification coefficient increase. The higher the temperature, the greater the densification coefficient. Sintering experiments show that the densification coefficient is related to the porosity of the sinter and the drum index, and the densification coefficient can characterize the strength of the sinter to a certain extent in the range of basicity 1.85–2.25.