Method for increasing purity of carbonyl iron powder
A carbonyl iron powder and purity technology, which is applied in the field of improving the purity of carbonyl iron powder, can solve the problems of high impurity content of ordinary carbonyl iron powder and difficult control of decomposer process parameters, etc., and achieve the effect of increased iron content, easy operation and improved purity
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Embodiment 1
[0015] The average particle size is 2.3μm, the bulk density is 2.4g / cm 3 , ordinary carbonyl iron powder with a purity of 97.0% is spread in the reduction furnace, the thickness of the powder is 2.5-3.0cm, and the reduction treatment is carried out by passing hydrogen gas. Dosage is 28Nm 3 / kg, the purity of hydrogen is 99.99%, and the purity of carbonyl iron powder treated by this method is greatly improved, from 97.0% to 99.6%.
Embodiment 2
[0017] The average particle size is 5.0μm, the bulk density is 3.4g / cm 3 , ordinary carbonyl iron powder with a purity of 98.0% is spread in the reduction furnace, the thickness of the powder is 1.0-1.5cm, and the reduction treatment is carried out by passing hydrogen gas. Dosage is 35Nm 3 / kg, the purity of hydrogen is 99.99%, and the purity of carbonyl iron powder treated by this method is greatly improved, from 98.0% to 99.7%.
Embodiment 3
[0019] The average particle size is 3.0μm, the bulk density is 2.8g / cm 3 , the ordinary carbonyl iron powder with a purity of 96.7% is spread in the reduction furnace, the powder thickness is 7.0-7.5cm, and the reduction treatment is carried out through a mixed gas of hydrogen and water vapor (water vapor accounts for 20% by volume), and the reduction furnace temperature Set it to 700-710°C, the reduction time is 2.5h, and the gas consumption is 38Nm 3 / kg, the purity of hydrogen is 99.99%, and the purity of water vapor is 99.9%. The carbonyl iron powder treated by this method has a greatly improved purity, from 96.7% to 98.6%.
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