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| Experimental research on preparation of ultra-fine iron powder by carbothermal pre-reduction and hydrogen reduction |
| KONG Ling-bing，GUO Pei-min，ZHAO Pei， WANG Lei |
| Central Iron and Steel Research Institute, Beijing 100081,China |
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Abstract The low-temperature carbon reduction and hydrogen secondary reduction tests were carried out on a steel strip test device to trial-produce ultra-fine metal iron powder. The effects of carbon powder with three different components on the quality of metal iron powder products were studied. The results shows that low-ash and high-fixed carbon content carbon powder meet the requirements for the preparation of pure metal iron powder; adding a small amount of catalyst can significantly improve the reduction effect of low-temperature carbon and the indirect reduction rate at low temperatures. When the reduction temperature is 850 ℃, the heating time is 2 h, the reduced carbon is 80% of the oxygen content in the raw material, and the addition amount of potassium carbonate is 0.5%-1%, the TFe of the iron powder is greater than 91.7%. It can be reduced by hydrogen at 750 ℃ for 2 h to obtain qualified ultra fine metal iron powder. The D50 of the ultra-fine iron powder is 5~6 μm, and the D90 is 10~12 μm, the apparent density is 1.35 g/cm3.
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Received: 20 November 2018
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2020, Vol. 30 
