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Nutrient activities of the slag obtained under different conditions. (a) Smelting at 1450 °C for 60 min under different acidity; (b) Smelting at 1450 °C for 60 min with an acidity of 0.92 under different cooling methods; (c) Smelting at 1450 °C with an acidity of 0.92 under different reaction time; (d) Smelting for 60 min with an acidity of 0.92 under different reaction temperature.
