Method for producing hot sponge iron by directly reducing iron based on ammonia gas
A technology of reduced iron and sponge iron, which is applied to furnace types, furnaces, shaft furnaces, etc., can solve the problem of complex greenhouse gas emissions from iron ore easily reduced, pulverized, bonded, and cooled equipment, and is easy to store for a long time. The effect of long-distance transportation, cost reduction, good reduction characteristics
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Embodiment 1
[0055] In this embodiment, the process of producing hot sponge iron by directly reducing iron ore with ammonia gas is as follows:
[0056] 1) Heat the reduction section of the shaft furnace to 900°C±1°C, put 3g±0.01g of iron oxide powder (purity: 99.95%) into the reduction section of the shaft furnace with a diameter of 20mm; feed nitrogen into the reduction section Purge for 10 minutes to discharge other gases in the reduction section; feed nitrogen into the reduction section at a flow rate of 100ml / min, and at the same time raise the temperature at a rate of 10K / min, and keep the temperature for 30 minutes after the temperature reaches 900°C;
[0057] 2) Feed the mixed gas of ammonia and nitrogen into the reducing section, wherein ammonia accounts for 40% by volume of the mixed gas; the mixed gas is preheated to 900°C;
[0058] 3) Ammonia is partially decomposed into hydrogen and nitrogen under the catalysis of iron oxide, and the decomposed hydrogen and undecomposed ammonia...
Embodiment 2
[0062] In this embodiment, the process of producing hot sponge iron by directly reducing iron ore with ammonia gas is as follows:
[0063] 1) Heat the reduction section of the shaft furnace to 900°C±1°C, put 8g±0.01g of natural lump ore (iron content 56.62%-65.69%) with a particle size of 10-12mm into the shaft furnace with a diameter of 20mm In the reduction section of the furnace; feed nitrogen into the reduction section to purge for 12 minutes, and discharge other gases in the reduction section; feed nitrogen into the reduction section at a flow rate of 90ml / min, and simultaneously raise the temperature at a heating rate of 12K / min. After the temperature reaches 905°C, keep the temperature constant for 30 minutes;
[0064] 2) Feed the mixed gas of ammonia and nitrogen into the reducing section, wherein ammonia accounts for 50% by volume of the mixed gas; the mixed gas is preheated to 920°C;
[0065] 3) Ammonia is partially decomposed into hydrogen and nitrogen under the ca...
Embodiment 3
[0069] In this embodiment, the process of producing hot sponge iron by directly reducing iron ore with ammonia gas is as follows:
[0070] 1) Heat the reduction section of the shaft furnace to 900°C±1°C, put 8g±0.01g of pellets with a particle size of 10-12mm (iron content is 64.87%-66.59%) into the shaft furnace with a diameter of 20mm In the reducing section of the furnace; feed nitrogen into the reducing section to purge for 8 minutes, and discharge other gases in the reducing section; feed nitrogen into the reducing section at a flow rate of 120ml / min, and raise the temperature at a heating rate of 8K / min at the same time. After the temperature reaches 910°C, keep the temperature constant for 30 minutes;
[0071] 2) Feed the mixed gas of ammonia and nitrogen into the reducing section, wherein ammonia accounts for 60% by volume of the mixed gas; the mixed gas is preheated to 880°C;
[0072] 3) Ammonia is partially decomposed into hydrogen and nitrogen under the catalysis o...
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Abstract
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