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首页> 外文期刊>ISIJ international >Optimization of Firing Temperature for Hematite Pellets
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Optimization of Firing Temperature for Hematite Pellets

机译：赤铁矿丸的烧结温度优化

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The heat hardening by oxidation is a process commonly used in iron ore pelletization process. The green pellets are fired in induration machine using Corex gas at JSW Steel Limited Pellet Plant. The firing temperature of induration machine strongly influences the physical and metallurgical properties of the pellet. Due to absence of exothermic reaction and poor roasting property of hematite pellet, the energy consumption of hematite pellet production is at higher side and requires higher roasting temperature. In present pelletization process, carbon burdened method is found to be more favorable technique in practice to enhance the induration of hematite pellets. Coke breeze is added in the pellet mix at JSW pellet plants to get the inherent fuel value of a hematite green ball equal to that of a magnetite pelletizing feed. The firing temperature (from corex gas) of the induration machine and carbon addition in the pellet mix is interrelated and decides physical and metallurgical properties of the pellets. At JSW Steel Pellet Plant the carbon addition varies from 0.90 to 1.50% and firing temperature varies from 1 230 to 1 320℃. Fluctuations in physical and metallurgical properties were observed due to deviation in carbon addition and firing temperature. Optimization of external firing temperature and coke breeze addition in the green pellet mix is necessary to get the desired properties of the pellet for iron making units. Basket trials were carried out at pellet plant induration machine by varying the external firing temperature from 1 220 to 1 330℃ and coke breeze addition from 0.7 to 1.4%. At firing temperature of 1 220, 1 250, 1 280, 1 310 and 1 330℃ the optimum carbon addition 1.30, 1.20, 1.10, 0.90 and 0.70% achieved the optimum physical and metallurgical properties of the pellet for iron making units respectively.
机译：通过氧化进行的热硬化是铁矿石造粒工艺中通常使用的工艺。在JSW Steel Limited造粒厂中，使用Corex气体在生坯机中烧制生坯。烧结机的烧结温度强烈影响粒料的物理和冶金性能。由于没有放热反应，赤铁矿团块的焙烧性能差，生产赤铁矿团块的能耗较高，需要较高的焙烧温度。在目前的造粒工艺中，发现碳负载法在实践中是更有利的技术，以增强赤铁矿粒料的硬结。在JSW造粒厂将微风添加到造粒混合物中，以使赤铁矿生球的固有燃料值等于磁铁矿造粒进料的固有燃料值。烧结机的燃烧温度（来自岩心气）和颗粒混合物中碳的添加是相互关联的，并决定了颗粒的物理和冶金性能。 JSW球团厂的碳添加量为0.90至1.50％，燃烧温度为1230至1320℃。由于碳添加量和烧成温度的偏差，观察到物理和冶金性能的波动。要使制铁设备的颗粒具有理想的性能，必须优化生坯颗粒混合物中的外部烧成温度和微风添加量。在制粒厂硬结机上进行篮试验，将外部燃烧温度从1 220℃更改为1 330℃，将焦炭添加量从0.7％更改为1.4％。在烧成温度为1220、1250、1280、1310和1330℃时，最佳碳添加量1.30、1.20、1.10、0.90和0.70％分别达到了用于炼铁装置的球团的最佳物理和冶金性能。

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