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| Investigation on Preparation of Pellets for Blast Furnace from Tin, Zinc-bearing Iron Concentrates by Grate-kiln Process |
| HAN Gui-Hong |
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Abstract The preparation of pellets for blast furnace from the complex iron ores containing tin and zinc (0.25%Sn, 0.20%Zn) were investigated in this paper. Based on the analysis of volatilization behavior of tin and zinc compound in the process of preheating and reduction roasting, the effects of preheating and roasting conditions on the removal of tin, zinc and strength of preheated and roasted pellets were investigated. The thermodynamic analysis indicated that the removal of tin and zinc occurs mainly in the weak reduction roasting stage. The experimental results under the optimal experimental conditions indicated that preheated pellets with compressive strength of 495 N/P and AC tumble index of 3.85%, roasted pellets with compressive strength of 2254N/P and ISO tumble index of 96.16% could be obtained; the volatilization of tin, zinc is 70.8% and 61.0%; the content of tin, zinc is decreased to 0.073%, 0.078% respectively. The finished pellets have good metallurgical performance, which meet the needs of blast furnace.
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Received: 05 August 2008
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2009, Vol. 1 