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鲁奇冶金公司(Lurgi Metallurgie)致力于Circored工艺的开发,一方面为了直接利用粉矿(无需造块)生产热压块,满足日益增长的直接还原炼铁工艺的需求;另一方面,鲁奇公司希望将其流化床技术的丰富经验推广应用于粉矿的直接还原。20世纪90年代初开发的Circored工艺以氢气作为单一还原剂,采用一个两级CFB反应器和一个FB反应器相结合的配置。1999年4月,特立尼达(Trinidad)首次建成了热压块(HBI)产能为50万t/a的Circored工厂。投产后的运行结果表明,Cicored工艺非常适用于铁矿粉的还原。但是,由于热直接还原铁(DRI)卸料系统的问题,没有连续生产出HBI产品。用一个连续操作的密封料腿代替原来的非连续锁斗后,工厂目前已经能够连续生产高质量的HBI。
Lurgi Metallurgie is dedicated to the development of the Circored process, on the one hand, to meet the needs of the growing direct reduction ironmaking process for the direct production of hot briquettes from powder mines (without building blocks); on the other hand, The company hopes to extend its rich experience in fluidized bed technology to the direct reduction of fines. The Circored process, developed in the early 1990s, uses hydrogen as the sole reductant with a combination of a two-stage CFB reactor and a FB reactor. In April 1999, Trinidad first built a Circored plant with a hot press block (HBI) capacity of 500,000 t / a. Operation results after commissioning show that the Cicored process is very suitable for the reduction of iron ore powder. However, HBI products are not continuously produced due to the problems of the DRI discharge system. With a continuously operating seal leg to replace the original non-continuous locker, the factory has been able to continuously produce high quality HBI.