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Molten steel dearsenication fluxing agent, and preparation method and application method thereof

A technology of arsenic removal and flux, applied in the field of metallurgy, can solve the problems of molten steel contaminated by arsenic removal products, corrosion of refractory materials, low efficiency of arsenic removal, etc., to improve stability and metallurgical effect, strong arsenic removal ability, and improve working environment Effect

Inactive Publication Date: 2015-07-08
JIANGSU UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to: provide a kind of flux for removing arsenic from molten steel and its preparation method and use method, overcome the low efficiency of removing arsenic in current flux system for removing arsenic, the contamination of molten steel by dearsenic products, and the use of CaF 2 Fluorine pollution caused by flux, severe corrosion of refractory materials and other key issues, to achieve high-efficiency, fluorine-free dearsenic, and produce high-quality pure steel

Method used

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  • Molten steel dearsenication fluxing agent, and preparation method and application method thereof
  • Molten steel dearsenication fluxing agent, and preparation method and application method thereof

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Embodiment

[0029] The present invention will be further elaborated below in conjunction with the examples; the examples are only used to illustrate the present invention, but not to limit the present invention in any way.

[0030] (1) Preparation of pre-melted arsenic-desorbing flux

[0031] The raw materials that embodiment adopts are as follows, and when referring to percentage below, be weight percent:

[0032] The chemical composition of active lime is: 100%>CaO≥90.0, 5%≥MgO>0, 2.5%≥SiO 2 >0, the rest are Al 2 o 3 and other trace impurities.

[0033] The chemical composition of industrial lithium oxide is: 100%>Li 2 O≥85.0, 8%≥SiO 2 >0,3%≥Al 2 o 3 >0, 2%>CaO≥0, the rest is Na 2 O and K 2 O and other trace impurities.

[0034] Take the above-mentioned raw materials and weigh them after baking at 200-250°C, and mix them according to the three batching methods in Table 1; break each raw material into 2mm or less, mix them mechanically, add them to a new ladle, and heat them ...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a molten steel dearsenication fluxing agent, and a preparation method and application method thereof. The molten steel dearsenication fluxing agent comprises the following components in percentage by mass: 88-95% of CaO, 5-12% of Li2O and the balance (0-5%) of impurity. After the molten steel is subjected to pre-deoxidation and desulfurization, [O] and [S] in the molten steel are respectively lowered to 0.001%; the dearsenication fluxing agent and aluminum-calcium alloy are added into a ladle together, wherein the addition amount of the dearsenication fluxing agent is calculated according to the principle that 10Kg of dearsenication fluxing agent can lower the arsenic content in every 100 ton of molten steel by 0.01%, and the addition amount of the aluminum-calcium alloy is 50 wt% of the dearsenication fluxing agent; and after dearsenication, the arsenic content in the molten steel is lowered to 0.001% below. Compared with the prior art, the dearsenication fluxing agent has the advantages of high dearsenication capacity, no pollution and high resource utilization ratio, and the dearsenication product does not pollute the molten steel, thereby solving the key problems in the existing dearsenication technique.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a flux for removing arsenic from molten steel, a preparation method and a use method. Background technique [0002] With the development of social economy, the market has higher and higher requirements on the performance of steel. The existence of impurity elements in steel will seriously affect the performance of steel and adversely affect the quality of steel. Therefore, the smelting of high-purity steel is the current steelmaking One of the cores of technological development; arsenic is one of the harmful elements existing in steel, it is easy to produce segregation at the interface of steel, which makes steel have high temper brittleness; when the arsenic content in steel is more than 0.2% , will cause severe segregation of steel, change the grain structure of steel, reduce the impact toughness of steel, and cause steel to crack during thermal processing; steel for speci...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 王宏明李桂荣朱祥
Owner JIANGSU UNIV
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