The current study helped to deepen understanding of the mechanisms behind reduction degradation of iron ore sinter. The model accuracy was very good taking into account the multivariable and complex nature of the sintering process. MSE was 0.25 using 7 inputs and 5 hidden nodes. The model is able to be investigated visually using 3-D video clips (Figure 1). The dislocation of RDI optima in a function of the time variable (b_2, in Figure 1) can be observed easily. It was found that the outside-air temperature can be used to describe the long-term behavior of RDI. It could not be determined, however, whether RDI depends on other periodic factors also. The effect of increasing temperature was detrimental on sinter. Its effect on production rate was also negative. The coke ratio in the sintering mix was found to be the best control variable concerning RDI. The index of mix physical properties (c-index) was found to decrease RDI and production rate values. High basicity was found to improve the sinter quality and also production rate. It was also found that alumina is not a significant predictor of RDI. Titanium content was found to be detrimental to the sinter. Ti content may also be an indicator of properties of certain special Ti bearing raw materials. The hearth layer height appeared to increase the RDI value and production rate.
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