Aluminum slag, desulfurizer and desulfurizing method for desulfurization of high silicon molten iron

A technology of hot metal desulfurization and high silicon, which is applied in the field of high silicon hot metal desulfurizer and aluminum slag for high silicon hot metal desulfurization, can solve the problems of poor desulfurization effect, and achieve the effects of promoting slag, increasing reaction heat, and economical operation

CN101676410BInactive Publication Date: 2011-06-29BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-06-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an aluminum slag for desulfurization of molten iron, in particular to an aluminum slag for desulfurization of high silicon molten iron. The invention also relates to a desulfurizer for the high silicon molten iron, and a desulfurizing method for desulfurization of the high silicon molten iron by using the desulfurizer for the high silicon molten iron. The aluminum slag for desulfurization of the high silicon molten iron comprises the following raw materials in percentage by weight: 48%-50% of aluminum powder, 38%-42% of bauxite, 7%-9% of fluorite powder and 2%-3% of pitch coke powder. The desulfurizer for the high silicon molten iron comprises the following raw materials: lime powder, fluorite and the aluminum slag for desulfurization of the high silicon molten iron, wherein the weight ratio of the lime powder to the fluorite to the aluminum slag for desulfurization of the high silicon molten iron is 8.5-9.2: 0.6-1.0: 0.5-0.8. The desulfurizing method for the high silicon molten iron comprises the following steps: (1) front slag skimming; (2) stirring the molten iron, and adding the desulfurizer for the high silicon molten iron into the molten iron in the process of stirring the molten iron; (3) desulfurizing and stirring; and (4) back slag skimming. The invention solves the technical problem that the prior traditional desulfurizer does not have good effect on desulfurization of abnormal molten iron.
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Description

technical field

[0001] The invention relates to an aluminum slag for desulfurization of molten iron, in particular to an aluminum slag for desulfurization of high-silicon molten iron. The invention also relates to a high-silicon hot metal desulfurizer made by using the aluminum slag for desulfurizing high-silicon hot metal, and a desulfurization method for using the high-silicon hot metal desulfurizer to desulfurize high-silicon hot metal. Background technique

[0002] With the improvement of people's living standards, the requirements for the purity of steel products are also getting higher and higher, making the molten iron pretreatment process in the iron and steel industry an indispensable link in steelmaking. At present, the sulfur content of all steel products is below 0.035%, which requires that the sulfur content of molten iron after pretreatment is less than 0.010% (low sulfur steel varieties require [S]≤0.003%). Correspondingly, molten iron pretreatment has higher...

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Embodiment Construction

[0029] The aluminum slag used for desulfurization of high-silicon molten iron of the present invention is made up of the following raw materials in weight percentage:

[0030] Aluminum powder 48%~50%

[0031] Bauxite 38%~42%

[0032] Fluorite powder 7%~9%

[0033] Pitch coke powder 2% to 3%.

[0034] The preparation method of the aluminum slag for desulfurization of high-silicon hot metal includes uniformly mixing various raw materials to form a conventional mixed material. The particle size can be selected conventionally.

[0035] The aluminum slag used for desulfurization of high-silicon molten iron of the present invention has added bauxite and pitch coke powder, and increased the proportion of fluorite powder. The theoretical basis is as follows:

[0036] 1), the molten iron desulfurization reaction is carried out as follows:

[0037] [S]+(CaO)=(CaS)+[O] (1)

[0038] From the equilibrium constant expression of reaction (1), it can be seen that the desulfurization rea...