摘要:
研究了适用于大型电炉钒铁冶炼浇铸过程的锭模打结工艺特性。考察打结料粒度配比、卤水配比、打结时间、刚玉渣配比及烘烤制度等参数对浇铸锭模中渗合金产生量及其钒含量的影响。结果表明:因浇铸锭模合金渗透而导致的钒损失随镁砂粒度及打结时间的增加而降低,随刚玉渣比例的提高而增加;同时随着卤水配比的提高,渗合金产生量及其钒含量呈先降低后升高的趋势;试验条件下的三种烘烤制度对锭模浇铸钒损影响较小。本研究最优工艺条件为:3~8 mm与0~3 mm镁砂粒度配比8:1,卤水配比2.5:1时,打结时间60 min,烘烤制度0~500℃ 2.0 h,500℃ 2.0 h,500~800℃ 2.0 h,800℃ 4.0 h。此时渗合金重量为131 kg,渗合金钒含量可降至2.43%,单炉渗合金钒损从8.82 kg降低到3.16 kg。
关键词:
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钒铁 /
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大型电炉 /
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浇铸锭模 /
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打结工艺 /
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渗合金
Abstract:
Ramming characteristics of the casting mold,which is suitable for ferrovanadium smelting by tilting furnace,was studied.The effects of magnesia particle size distribution,brine ratio,ramming time,corundum slag ratio and baking program on the amount of seeping ferrovanadium in casting mold and its vanadium content were investigated.The results indicate that vanadium loss in casting process decreases with increase in magnesia particle size and ramming time while increases with the increasing corundum slag ratio.Meanwhile,vanadium loss decreases at first and increases subsequently with increase in brine ratio.The baking program has nearly no effect on vanadium loss in the experiments.In this study,the vanadium loss is calculated to be 3.16 kg when the weight of seeping alloy is 131 kg with 2.43% of vanadium content at the optimal experimental conditions for 8:1 of magnesia particle size ratio(3~8 mm/0~3 mm),2.5:1of brine ratio,60 min of ramming time,and 0~500℃ for 2.0 h,500℃ for 2.0 h,500~800℃ for 2.0 h,800℃ for 4.0 h of baking program.
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