Direct-reduction ironmaking method and system for iron-containing mineral powder
A technology for iron ore powder and reduced iron, which is applied in the field of direct reduction iron-making methods and systems containing iron ore powder, can solve the problems of complex process equipment and low reduction efficiency, and achieves simple reduction process, high reduction efficiency, and shortened reaction time. effect of time
Active Publication Date: 2015-06-03
湖南长拓高科冶金有限公司
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The invention provides a direct-reduction ironmaking method and system for iron-containing mineral powder. The direct-reduction ironmaking method for the iron-containing mineral powder comprises the following steps: S1, carrying out flash reduction on the iron-containing mineral powder with a reducing gas at 800-1,000 DEG C, and finishing reducing reaction within 20-120 seconds to obtain a mixture containing direct-reduced iron and a tail gas; S2 carrying out gas-solid separation on the mixture, and respectively obtaining the direct-reduced iron and the tail gas, wherein the volume sum of hydrogen and carbon monoxide in the reducing gas is greater than 70% of the total volume of the reducing gas. In the implementation process of the method, iron-containing mineral powder is in a suspended flow state, and has great heat and mass transfer ability between a gas and solid; and the heat and mass transfer ability is over 50 times of accumulation state reaction, therefore, the direct-reduction ironmaking system has an extremely high reaction speed; the reaction time can be greatly shortened; the reaction speed can be accelerated by the reducing gas; complete reduction reaction is promoted; an intermediate reduction product is avoided; and improvement of the metal conversion rate is facilitated.
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Fluidised-bed furnaces
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Property | Measurement | Unit |
Granularity | <= 0.1 | mm |
Granularity | <= 0.038 | mm |
Granularity | <= 0.074 | mm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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