碳酸钙对钒钛磁铁精矿直接还原-熔分的影响

 钒钛磁铁精矿在配加石墨还原剂和碳酸钙的条件下进行预还原和熔分。试验研究了碱度（碳酸钙的加入量）以及冷却工艺对直接还原和熔分的影响。反应后的样品用XRD和化学分析法进行分析。结果表明：在低碱度范围内[(R=0～0.7)]，碱度的增加有利于钒钛磁铁精矿的直接还原和熔分。熔分温度为1 600 ℃，熔分时间为20 min，试验样品在碱度为0.5时熔分状态良好，渣中几乎不带铁。空冷有利于提高渣中黑钛石的含量，但不利于镁铝尖晶石相的析出；缓冷有利于渣中镁铝尖晶石相的析出，但会使渣中黑钛石的含量有所降低。

Effect of CaCO3 on Direct Reduction-Smelting Separation of Vanadium-Bearing Titanomagnetite Concentrate

Vanadium-bearing titanomagnetite concentrate was direct-reduced and smelt-separated isothermally with graphite and CaCO3. The influences of alkalinity and cooling technique on reduction and smelting separation were studied. XRD and chemical analysis were used to characterize the reduced samples. Results shows that the increase of alkalinity is beneficial to the reduction and smelting separation of vanadium-bearing titanomagnetite concentrate in the context of low alkalinity[(R=0-0.7)]. Metallized pellets smelt-separated well at the temperature of 1 600℃ after melting 20 minutes with the alkalinity of 0.5, the slag dosen’t include iron nearly. Air-cooling technique is beneficial to increasing anosovite content of slag, but not to separating out of magnesica-alumina spinel. Furnace-cooling technique is beneficial to separating out of magnesica-alumina spinel, but not to increasing anosovite content of slag.