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本文记叙了攀枝花氧化球团、钠化球团和水浸提钒球团还原热膨胀性能测定的实验室研究工作,为氧化球团高炉冶炼、钠化球团竖炉直接还原及水浸提钒高炉冶炼等工艺流程试验提供了必要的理论依据。本文认为判断正常膨胀和异常膨胀,除考虑最大线膨胀率和体积膨胀率外,应重视膨胀后的物理状态。氧化球团属正常膨胀,适于高炉冶炼;氧化钠化球团和水浸提钒球团为异常膨胀,不适于竖炉还原或高炉冶炼。 500℃至700℃间球团急剧膨胀发生在α—Fe_2O_3还原为Fe_3O_4阶段,钠盐对膨胀起着催化和粉化作用。钠化球团先磁化焙烧,水浸提钒球团采用预还原法,都是消除异常膨胀的有效措施,以保证竖炉还原或高炉冶炼的正常进行。
This paper describes the laboratory research work on the determination of the thermal expansion and reduction properties of Panzhihua oxidized pellets, sodium-pelletized pellets and water-immersed vanadium pellets for blast furnace smelting of oxygenated pellets, direct reduction of sodium-pelletized pellets and vanadium leaching by water immersion Smelting process test provides the necessary theoretical basis. In this paper, to judge the normal expansion and abnormal expansion, in addition to taking into account the maximum linear expansion and volume expansion, should pay attention to the physical state after expansion. Oxidation pellets are normal expansion, suitable for blast furnace smelting; sodium oxide pellets and water immersed vanadium pellets for the abnormal expansion, unsuitable for shaft furnace reduction or blast furnace. The rapid expansion of pellets from 500 ℃ to 700 ℃ occurred in the stage of α-Fe_2O_3 reduction to Fe_3O_4, and sodium salt played a catalytic and powdering role in the expansion. Pre-magnetization roasting of sodium-containing pellets and pre-reduction of vanadium-bearing pellets by water immersion are all effective measures to eliminate abnormal expansion and ensure the normalization of shaft furnace reduction or blast furnace smelting.