摘要:
研究了适用于倾翻炉一步法和两步法钒铁冶炼过程混合钒氧化物铝热反应的冶炼特性。考察不同钒氧化物配比、不同配铝系数对渣中钒损及单炉冶炼效率的影响。结果表明:V2O3的增加能够有效降低平衡态渣中钒含量,但不利于提高单炉冶炼效率,原料配比(罐数比)从0∶8提高到6∶2时,渣中钒含量从2.23%降低至1.85%,单炉渣量减少19.7%,单炉冶炼时间从180 min增加到194 min;两步法冶炼过程中,随着配铝系数提高到1.20,贫渣钒含量从一步法钒铁冶炼的1.85%降低至0.44%,渣中平均钒含量降低至0.88%;贫渣时间从194 min减少至146 min,精炼时间则从0增加到94 min,单炉冶炼周期较一步法延长46 min;最优试验条件下,合金产品中钒含量提高到51.6%,铝含量降低到低于0.3%的水平,在提高合金品质的同时也提高了铝的利用率。
Abstract:
Metallurgical characteristics of the aluminothermic reaction between vanadium oxides and aluminum,which is suitable for ferrovanadium smelting in tilting furnace by one-step and two-step approach,was studied. The effects of vanadium oxides ratio and aluminum coefficient were investigated on smelting efficiency and vanadium loss in slag. The results indicate that vanadium content in slag and the smelting efficiency both decrease with increase of V2O3 ratio in the vanadium oxides. When the ratio between V2O3 and V2O5 in raw materials changes from 0:8 to 6:2,vanadium content in slag reduces from 2.23% to 1.85% with the total weight of slag decreased by 19.7%,and the smelting time increases from 180 min to 194 min. Compared to one-step method,vanadium content in poor slag reduces from 1.85% to 0.44% and average vanadium content in poor and refining slag reduces to 0.88%,with aluminum coefficient increased to 1.20 in two-step smelting process. Dilution time reduces from 194 min to 146 min,yet refining time increases from 0 to 94 min and smelting time is prolonged by 46 min in twostep smelting process. Under the optimal conditions,the content of vanadium increases to 51.6% and the content of aluminum reduces to less than 0.3% in alloy,which improves the utilization rate of the aluminum and alloy quality.