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到本世纪八十年代止世界上出现过的直接还原铁(Direction Reduction Iron-DRI)法已有100多种,但其中大部由于经济原因已被淘汰,至今仍在生产和继续发展的还有数十种。它们基本可以分成两类,即以天然气裂化产物(H_2+CO)的H_2为主要还原剂的天然气裂化还原法,和以固体燃料煤炭产生(H_2+CO)中的CO为还原剂的煤基还原法。1984年DRI的产量达925万吨,设计能力在2020万吨以上,其中天然气裂化法占95％以上,主要集中在天然气丰富兼有铁矿石的地
By the 1980s, more than 100 Direction Reduction Iron-DRI laws have appeared in the world, but most of them have been eliminated for economic reasons and are still being produced and continue to be developed. Dozens. They can be divided into two basic categories: natural gas cracking and reduction with H 2 gas from natural gas cracking products (H 2 + CO) as the main reducing agent and coal-based reduction with CO from CO 2 as a fuel in solid fuel law. DRI production in 1984 reached 9.25 million tons, design capacity of more than 20.2 million tons, of which 95% of natural gas cracking method, mainly concentrated in natural gas rich in iron ore and