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    • 10. 发明申请
    • Process and plant for reducing solids containing iron oxide
    • 用于还原含有氧化铁的固体的方法和装置
    • US20070079666A1
    • 2007-04-12
    • US10567821
    • 2004-07-16
    • Stuart SneydMartin HirschDirk Nuber
    • Stuart SneydMartin HirschDirk Nuber
    • C21B15/00
    • C22B5/18C21B13/0033C21B13/008C21B13/0086C22B1/248C22B5/14Y02P10/136
    • This invention relates to a process for reducing solids containing iron oxide, such as iron ore, in which fine-grained solids are heated and at least partly calcined in a pre-heating stage (2, 9). In a first fluidized-bed reactor (14) downstream of the preheating stage (2, 9), the solids are prereduced and reduced further in a second fluidized-bed reactor (16). Downstream of the second reactor (16) a briquetting stage (20) is provided, in which the solids are briquetted at a temperature above 500° C. To increase the energy efficiency of the process and improve the flowability of the solids in the briquetting stage (20), magnesite is added to the preheating stage (2, 9) together with the solids containing iron oxide, which magnesite is at least partly calcined in the preheating stage (2, 9) to obtain magnesium oxide. Furthermore, the invention relates to a corresponding plant.
    • 本发明涉及一种用于还原含铁氧化物的固体的方法,例如铁矿石,其中细粒固体被加热并且在预热阶段(2,9)中至少部分地煅烧。 在预热阶段(2,9)下游的第一流化床反应器(14)中,固体在第二流化床反应器(16)中被进一步还原并还原。 在第二反应器(16)的下游提供压块级(20),其中固体在500℃以上的压块压块。为了提高该方法的能量效率并提高压块阶段的固体的流动性 (20)中,将菱镁矿与含有氧化铁的固体一起加入到预热段(2,9)中,该氧化铁在预热阶段(2,9)中至少部分地煅烧以获得氧化镁。 此外,本发明涉及相应的设备。