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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。
The characteristics of the ingot mold knot applied to the smelting process of the ferrovanadium in a large electric furnace were studied. The influences of the ratio of the size of knotting material, the proportion of brine, the timing of knotting, the proportion of corundum slag and the baking system on the amount of the infiltrated alloy and the content of vanadium in the ingot mold were investigated. The results show that the vanadium loss caused by the infiltration of ingot mold alloy decreases with the increase of the magnesia sand size and the tying time, and increases with the increase of the proportion of corundum slag. At the same time, with the increase of the brine ratio, The content of vanadium decreased first and then increased. Under the experimental conditions, the three kinds of baking system had less influence on the vanadium loss of ingot casting. The optimum technological conditions for this study were as follows: the proportion of magnesia sand of 3 ~ 8 mm and 0 ~ 3 mm was 8:1, the time of knotting was 60 min and the baking time was 0 ~ 500 ℃ 2.0 h when the ratio of brine to water was 2.5:1, 500 ℃ 2.0 h, 500 ~ 800 ℃ 2.0 h, 800 ℃ 4.0 h. The weight of infiltrated alloy is 131 kg, the content of infiltrated gold and vanadium can be reduced to 2.43%, and the loss of infiltrated gold and vanadium from single furnace can be reduced from 8.82 kg to 3.16 kg.