When performing desulfurization treatment outside the furnace, the heat generating agent not only generates a large amount of heat, but also contributes to promoting CaC: dispersion in molten iron. When the amount of the heating agent and its added amount is constant, the desulfurizing agent component is adjusted, and then the desulfurizing agent having high desulfurization efficiency is selected. The preferred heat generating agent and the preferred desulfurizing agent constitute a heat generating desulfurizing agent. The proportioned heat-generating agent and the desulfurizing agent are made into small particles, and the iron-filled bag is treated by the punching method. The temperature is 1400, C-1450, and the mixture is stirred for Zmin after C treatment, and poured into blocks for analysis.
After the thermal agent is selected in the test, the desulfurizing agent is preferred. Under the same desulfurizing agent, the effect of different heat-generating agents on the desulfurization rate was tested, and the desulfurization rate was selected from the data in the table. The desulfurization effect of the heating agent Hz was the best, and the desulfurization effect of Hz was the worst. The reason is that FeO in Hzl does not completely react, which is unfavorable for desulfurization, and the latter test uses Hz heating agent. The main reason is that Mg is a desulfurizing agent on the one hand and promotes the desulfurization reaction. On the other hand, excessive Mg forms MgO into the slag, and the alkalinity is increased to increase the melting point of the slag. The increase in dryness is not conducive to the diffusion of S. The desulfurization rate is lowered.
The ratio of the heat generating agent to the desulfurizing agent is preferably such that when the amount of the desulfurizing agent TL: is 2%, the effect of the heat generating agent Hz on the desulfurization rate. When the amount of the added person is about 1%, that is, when the heat generating agent accounts for about 33% of the heat generating desulfurizing agent, the desulfurization rate is high. The reason is that the heating agent can emit heat to increase the temperature of the molten iron. At the same time, the AI:03 has a slag effect. As the Hz increases, the amount of heat generated increases, and the amount of A120 produced increases, which is beneficial to desulfurization.
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