Method for dephosphorization of molten iron, and refining agent
A technology of refining agent and molten iron, which is applied in the dephosphorization method of molten iron and the field of refining agent, can solve the problems that the refining agent is difficult to melt, the dephosphorization reaction cannot be carried out efficiently, and the reaction time is short, so as to improve the efficiency of dephosphorization treatment Effect
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Embodiment 1
[0083] Next, Example 1 performed by the inventors of the present application will be described. In Example 1, with respect to the dephosphorization method related to the above-mentioned embodiment, the dephosphorization treatment was performed by changing the Ig-loss value of the lime source as the refining agent 7, and the relationship between the Ig-loss value and the dephosphorization rate (dephosphorization rate) was investigated. coming impact.
[0084] In Example 1, first, the molten iron 2 that has been tapped from the blast furnace and desiliconized in the blast furnace sand bed is transferred and injected into a molten iron tank with a capacity of 250 tons as the molten iron holding container 1, and transported to figure 1 The dephosphorization treatment equipment shown. Next, in the dephosphorization treatment equipment, the refining agent lime source is blown in from the injection lance 3, the gaseous oxygen source 9 and the dephosphorization agent 11 are injected ...
Embodiment 2
[0091] Next, Example 2 performed by the inventors of the present application will be described. In Example 2, the stirring power (ε g +ε p ) to carry out dephosphorization treatment, and investigate the effect of stirring power on the dephosphorization rate.
[0092] In Example 2, the dephosphorization treatment was performed by changing the stirring power (gg+εP) from 265 W / t to 1392 W / t under the same conditions as in Examples 1-11. It should be noted that the phosphorus concentration before the dephosphorization treatment of the molten iron 2 is 0.121% by mass to 0.125% by mass. About other conditions, it is the same as Example 1-14.
[0093] Table 2 shows the stirring power and refining agent conditions in Example 2, and the phosphorus concentration and dephosphorization rate in the molten iron 2 before and after the treatment as the investigation results.
[0094] As shown in Table 2, it was confirmed that under any conditions, although the dephosphorization rate was ...
Embodiment 3
[0098] Next, Example 3 performed by the inventors of the present application will be described. In Example 3, regarding the dephosphorization method according to the above-mentioned embodiment, the dephosphorization treatment was performed by changing the specific surface area of the refining agent 7, and the influence of the specific surface area of the refining agent 7 on the dephosphorization rate was investigated.
[0099] In Example 3, for the same conditions as in Example 2-3, the specific surface area of the refining agent 7 was changed to 0.41m 2 / g~5.13m 2 / g to carry out dephosphorization treatment respectively. It should be noted that the phosphorus concentration before the dephosphorization treatment of the molten iron 2 is 0.121% by mass to 0.125% by mass. About other conditions, it is the same as Example 2-3.
[0100] Table 3 shows the stirring power and refining agent conditions in Example 3, and the phosphorus concentration and dephosphorization rate i...
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Abstract
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