H_2 ガス, NH_3 変成ガスおよび C_3H_8 変成ガスによる酸化鉄粉の還元について

概要

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H_2, CO, H_2+CO, or a gas consisting mainly of CO and H_2 are used as reducing agent of the iron ores. It is well known that various manufacturing methods of metallic iron, treated iron ores with gases have been recently investigated in Japan as well as abroad. As a fundamental experiment of manufacturing of iron powder, studies were made on the reduction of hematite powder with H_2, NH_3 cracking, and C_3H_8 cracking gases. The results obtained are as follows ; 1) The determining step of the reduction with H_2 gas is a chemical reaction between H_2 gas and iron oxide. 2) In the reduction processes, the reduction velocity is reduced when the Wustite phase appeared. 3) When the iron oxide is cracked, the reduction velocity is accelerated. 4) The use of the temperature range of 550∿560℃ is advantageous, when the iron oxide powder is reduced with H_2 gas. 5) The reduction behaviour with NH_3 cracking gas is almost the same as with H_2 gas, but the reduction velocity is rather slower. 6) The reduction velocity at the early period is different from that at the later period, during which it becomes faster. 7) The reduction velocity with C_3H_8 cracking gas is the slowest among those of all the methods used here. 8) When fine hematite powder is sintered at above 800℃, it is necessary to increase the flow rate of reducing gas and to reduce it at about 800℃ by the reduction with C_3H_8 cracking gas.
1962-08-01