Effects of Li<sub>2</sub>O on Properties of Low Fluoride Content Mould Flux for High Speed Continuous Casting

In order to reduce fluorine pollution, partial fluoride could be replaced by Li 2 O in mould flux. The effects of Li 2 O on properties of low fluoride content mould flux for high speed continuous casting were studied. The properties included melting temperature, viscosity, fluidity, surface tension and Al 2 O 3 inclusion adsorption. The results showed that with the increase of Li 2 O content, melting temperature and viscosity of mould flux decreased obviously, fluidity increased, surface tension changed little, and Al 2 O 3 inclusion adsorption of mould flux increased. In order to play an effective role, the appropriate Li2O content should be less than 4 per cent. The crystallization state of mould flux changed after slag adsorbed Al 2 O 3 . There were some small cuspidine and wollastonite crystals in the sample.