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Effect of TiO_2-comtent on Reduction of Iron Ore Agglomerates

机译：TiO_2-comtent对铁矿石团聚物还原的影响

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The effect of titanium oxide on iron ore agglomerates is studied by the use of test sinter, test pellets and synthetic briquettes under laboratory conditions. Titanium favours secondary hematite rather than magnetite, which is the main phase in the sinter of Rautaruukki's Raahe plant. Additionally, the effects of sinter RDI and pellet LTD on the blast furnace process are evaluated using the test results of basket trials in LKAB's Experimental Blast Furnace. The effect of titanium in synthetic hematite is studied as hematite is reduced to magnetite in the RDI test. This occurrence causes deterioration in burden permeability. Synthetic titanium-bearing iron oxides under controlled conditions are investigated at the University of Oulu. The effect of TiO_2, in solid solution in magnetite, on the magnetite to hematite oxidation is studied separately in order to simulate the final stage of the sintering process. In other experiments, hematite samples doped with various contents of TiO_2 are studied using thermogravimetry under a controlled gas atmosphere (CO/CO_2/H_2/N_2). The TiO_2 content of hematite has a clear effect on reduction degradation. Also increasing content of TiO_2in solid solution in magnetite radically accelerates the oxidation rate. In the pilot tests, TiO_2content has a similar negative effect on the reduction strength of both sinter and pellets.
机译：氧化钛对铁矿石团聚体的影响是通过在实验室条件下使用测试烧结矿、测试球团和合成煤球来研究的。钛偏爱次生赤铁矿而不是磁铁矿，磁铁矿是 Rautaruukki 的 Raahe 工厂烧结矿的主要阶段。此外，使用LKAB实验高炉的篮子试验结果评估了烧结RDI和球团LTD对高炉工艺的影响。研究了钛在合成赤铁矿中的影响，因为在RDI测试中赤铁矿被还原为磁铁矿。这种情况会导致负担渗透率恶化。奥卢大学研究了受控条件下的合成含钛氧化铁。为了模拟烧结过程的最后阶段，分别研究了磁铁矿固溶体中TiO_2对磁铁矿氧化的影响。在其他实验中，在受控气体气氛（CO / CO_2 / H_2 / N_2）下使用热重法研究了掺杂各种TiO_2含量的赤铁矿样品。赤铁矿的TiO_2含量对还原降解有明显影响。此外，增加磁铁矿中TiO_2in固溶体的含量会从根本上加速氧化速度。在中试试验中，TiO_2content对烧结矿和球团的还原强度都有类似的负面影响。

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