Technological process for producing reduced iron fine-powder
A process method and iron fine powder technology are applied in the field of secondary reduction iron powder production technology, which can solve problems such as high carbon content and inability to meet the technical requirements of iron fine powder, achieve low production cost, improve product quality, and process Reasonable effect of the process
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[0009] Example 1:
[0010] The primary reduced iron powder with a content of 98.5% is fed into the steel belt-type iron fine powder reduction furnace, and then the reduction furnace is heated. When the temperature is increased to 800~850℃, decomposed ammonia gas (liquid ammonia is pyrolyzed into 75 %H 2 +25%N 2 Mixed gas), continuous input of iron powder and reducing gas at this reduction temperature, the ammonia flow is controlled at 45-50m 3 Per hour, and pass water vapor and hydrogen chloride gas at the same time, the flow rate is 5~7m 3 / Hour, the mixing volume ratio of water vapor and hydrogen chloride gas is 1:0.1~0.2, the temperature of water vapor is 120~150℃, the dew point of decomposed ammonia is controlled at -30~-50℃, when the reduction reaction time reaches 3~4 hours , Keep the temperature at 850℃~900℃ for 1~2 hours to get the final product.
Example Embodiment
[0011] Example 2:
[0012] The primary reduced iron powder with a content of 98.0% is fed into the steel belt-type iron fine powder reduction furnace, and then the reduction furnace is heated. When the temperature is increased to 800~850℃, decomposed ammonia gas (liquid ammonia is pyrolyzed to 75 %H 2 +25%N 2 Mixed gas), continuous input of iron powder and reducing gas at this reduction temperature, the ammonia flow is controlled at 45-50m 3 / Hour, and pass water vapor and hydrogen chloride gas at the same time, the flow rate is 8~10m 3 / Hour, the mixing volume ratio of water vapor and hydrogen chloride gas is 1:0.1~0.2, the water vapor temperature is 120~150℃, the dew point of decomposing ammonia gas is controlled at -30~-40℃, when the reduction reaction time reaches 3~4 hours , Keep the temperature at 850℃~900℃ for 1~2 hours to get the final product.
[0013] The list of product inspection results is as follows: (unit wt%)
[0014]
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