A Study on the Carbon Nitriding Process of BF Slag Containing Titanium

Abstract

The experiment was done in which the BF slag containing titanium produced by Pangang with vanadium-titanium magnetite was dealt with carbon and nitrogen. The possibility of the carbon nitriding reactions were analyzed theoretically. It is found by thermodynamic calculation that the carbon nitriding of TiO2 is easier than that of other oxides and the temperature of carbon nitriding of perovskite can be reduced with the presence of Al2O3 and SiO2 in slag. The phase composition and microstructure of production from carbon nitriding were studied using X-ray diffraction and SEM. It is approved that the main phase composition of production from carbon nitriding under N2 was Ti(C,N). The influence factors, temperature, holding time and particle size were investigated. The results show, the phase compositions of the slag is mainly perovskite; the most suitable temperature and holding time of carbon nitriding is about 1450°C; the most appropriate holding time was about 2 hours and the most suitable size of the slag particle is about 180 meshes. With the optimization of the process, the size of Ti(C,N) can be increased which will benefit the recycle of Ti(C,N) in ore dressing.