Fluxing Strategy for Nickel Slags containing Magnesia
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Liquidus temperatures within the FeO-Fe2O3-MgO-CaO-Al2O3-SiO2 system have been assessed using FACTSage software to provide a better understanding of the effects of silica, calcia and alumina fluxes on slag liquidus temperatures for Fe/MgO mass ratios in slag ranging from 4 to 8. Flux combinations for the attainment of an example target liquidus temperature of 1325oC have been calculated and a feed-forward fluxing strategy is suggested for liquidus control in which Fe/MgO and SiO2/MgO mass ratios are coupled with Al2O3/MgO and CaO/MgO mass ratios. These combined ratios directly relate the required tonnes of flux to tonnes of magnesia in concentrate and subsequently in slag.
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