Effect of gangue composition on assimilation characteristic of iron ore in the sintering process

ABSTRACT

A new method for determining the timing of assimilation reaction by measuring the change of electrical conductivity of assimilation reaction contact surface was proposed. Experimental study of lowest assimilation temperature (LAT) of 15 iron ores were conducted, and pure reagents simulating tests of LAT were also carried out for purpose of achieving the influence of gangue composition on LAT. The results show that for pure reagents, the increase of Al₂O₃ and MgO promoted the LAT, low SiO₂ (≤3.0 wt%) was good to the LAT, but high SiO₂ (>3.0 wt%) was bad, LOI was favorable for LAT. For iron ores, the influence of gangue composition on LAT is basically the same as that of pure reagents, but the linear correlation coefficient is not obvious. It is better to study the effect of synergy of SiO₂, Al₂O₃ and MgO content in iron ore on LAT than that of single factor.

KEYWORDS:

• Sinter
• iron ore
• sudden change of resistance
• assimilation characteristic
• gangue

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Key Program of National Natural Science Foundation of China (grant number U1660206), the Program National Natural Science Foundation of China (grant number 51674002, 51704009).