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1.Fastmet还原法概述美国Midrex公司开发的Fastmet还原法,可将氧化铁粉和煤粉生产出适于冶炼生铁或特殊钢用的海绵铁。该法的关键设备是转底炉,它类似于钢铁厂通常用于加热钢坯和钢管的环形加热炉。早在50年代,Ross公司(Midrex公司的前身)就将转底炉用于直接还原,称之为“快热法”,其流程包括铁矿粉与煤粉的混合和造球,球团矿在炉篦上干燥和在转底炉上预还原,然后在竖炉中冷却。此法1964～1966年在2t/h试验装置上进行了成功的试验。由于当时还开发了天然气基的Midrex直接还原法,它的产品质量
1.Fastmet reduction method Overview Midrex company developed the United States Fastmet reduction method, the iron oxide powder and pulverized coal can be produced for smelting pig iron or special steel sponge iron. The key equipment of the law is a rotary hearth furnace, which is similar to the ring furnace that steel mills commonly use to heat billets and tubes. As early as the 1950s, Ross Company (Midrex’s predecessor) put the rotary hearth furnace for direct reduction, which is called “fast-heating method”. The process includes mixing and pelletizing iron ore powder with pulverized coal and pellets Drying on a grate and pre-reduction on a rotary hearth furnace followed by cooling in a shaft furnace. This method from 1964 to 1966 in the 2t / h test device was successfully tested. Due to the development of natural gas based Midrex direct reduction method, its product quality