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Thesis Advisor张宗诚
Degree Grantor中国科学院研究生院
Abstract本文研究了三种碱度(0.07,1.0,1.5,),四种MgO添加量(0,1%,2%,3%)的12种铁精矿球团的中、低温(900 ℃)还原性、高温(1300 ℃)还原性及软熔性能。深入研究了不加MgO的酸性球团在1000 ℃以上的升温还原时内部结构的变化规律。研究了预还原对铁矿石球团的软熔性能的影响。探讨了铁矿石球团在1000 ℃以上还原时的动力学规律。结果表明:1. 添加MgO可使铁矿石球团的高温性能得到改善。但自熔性球团和熔剂性球团的MgO添加量超过2%时,球团的低温还原性变差。2. 铁矿石球团1000 ℃以上的升温还原过程可分为四个阶段:升温还原阶段、还原滞后阶段、初始熔化阶段及熔化滴落阶缎。升温还原过程中,球团内部出现空心。3. 预还原率提高,球团的高温性能得到改善。4. 高温还原时,表观化学反应速度常数不仅是温度的函数,而且受到球团内部结构的强烈影响。5. 升温还原实验结果可近似用扩散控制方程来处理。还原过程的四个阶段内各有一个表观平均扩散系数。
Other AbstractIsothermal reduction tests at 900 ℃, 1300 ℃ for reducibility and heating-up reduction tests above 1000 ℃ for high temperature properties were carried out by useing 12 kinds of the iron ore pellets (basicity. 0, 1.0, 1.5; addition of MgO. 0, 1%, 2%, 3%). Following results were obtained: 1. For all kinds of pellets, the more addition of MgO, the better high temperature properties. But, For the self-fluxed and the fluxed pellets, when the addition of MgO is over 2%, the reducibility at 900 ℃ gets worse. 2. The process of heating-up reduction above 1000 ℃ can be separated four stages: the heating-up reduction stage, the reduction retadation stage (softening stage), the start-melting stage and the melting-droping stage. In the process, the hollow was found at the centre of the pellets. 3. The high temperature properties of pellets change better with the increase of the reduction degree at 1000 ℃. 4. During heating-up reduction above 1000 ℃, the apparent chemical reaction rate constant is not only the function of temperature, but also the parameters of inner construction of the pellets. 5. The data of heating-up reduction tests can be dealt with the diffusion equation approximately The diffusion coefficients in every stage of the heating-up reduction have been obtained.
Document Type学位论文
Recommended Citation
GB/T 7714
晋保平. 铁精矿球团还原、软化和熔化性能的研究[D]. 中国科学院研究生院,1988.
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