The green production of the steelmaking process has urgent requirements for fluorine-free fluxes. In
this article, a new solid waste-based slagging flux was applied in the external dephosphorisation test
of low silicon hot metal to replace the traditional fluorite-lime dephosphorisation slag. The results
showed that under laboratory conditions, the new flux was utilised for smelting low-silicon molten
iron with a phosphorus content of 0.10~0.13 wt per cent, the temperature of the molten iron was
1350°C and the slag amount was controlled at 2 per cent. Within ten minutes of smelting, the
dephosphorisation rate of the molten iron reached more than 50 per cent. When making slag with
new flux, the slag melting time was about 40 seconds and the P2O5 content in the final slag was
higher than 8 wt per cent. In the industrial test of a 150 t molten iron ladle, under the same molten
iron conditions, an out-of-furnace dephosphorisation test was conducted in the Kambara Reactor
(KR) process. The flux material consumption per ton of steel was 8~10 kg. Within 15 minutes of
smelting, the dephosphorisation rate of the molten iron was about 30 per cent. During flux slag
making, the slag melting time was about three minutes and the P2O5 content in the final slag was
higher than 6 wt per cent. This new solid waste-based flux has significant cost advantages and outof-
furnace dephosphorisation effects and is expected to become the benchmark for a new generation
of fluorine-free steelmaking fluxes.