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An ultra-high alkalinity, low-aluminum, fluorine-free refining slag and its preparation method and use method

A technology of refining slag and alkalinity, which is applied in the field of refining outside the steelmaking furnace, can solve the problems of refractory erosion, easy saturation of the ability to absorb inclusions, fluorine pollution, etc., to reduce gas absorption and oxidation, improve the ability of inclusions, and eliminate The effect of fluorine pollution

Inactive Publication Date: 2011-12-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a fluorine-free refining slag with ultra-high alkalinity, low aluminum, and overcome the fluorine pollution caused by the current refining slag desulfurization, low phosphorus capacity, easy saturation of the ability to absorb inclusions, and fluorite as a flux. , serious erosion of refractory materials and other key issues, better play the metallurgical function of slag refining outside the furnace, improve the quality of molten steel, smelting efficiency and refining equipment life

Method used

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  • An ultra-high alkalinity, low-aluminum, fluorine-free refining slag and its preparation method and use method
  • An ultra-high alkalinity, low-aluminum, fluorine-free refining slag and its preparation method and use method
  • An ultra-high alkalinity, low-aluminum, fluorine-free refining slag and its preparation method and use method

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Embodiment

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

[0030] (1) Preparation of premelted refining slag

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

[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] Chemical composition of boric anhydride: 100%>B 2 o 3 ≥85.0, 5%≥CaO>0, 3%≥MgO>0, 3%≥SiO 2 >0, the rest are trace impurities;

[0034] The chemical composition of magnesia: 100%>MgO≥90.0, 5%≥CaO>0, 3%≥Al 2 o 3 >0,1%≥SiO 2 >0, the rest are trace impurities;

[0035] Chemical composition of aluminum ash: 100%>Al 2 o 3 ≥90.0, 5%≥CaO>0, 3%≥MgO>0, 1.5%≥SiO 2 >0, the rest are trace impurities;

[0036] Take the above-mentioned raw mat...

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Abstract

The invention relates to an ultrahigh basicity low aluminum fluorine-free refining slag and a preparation method and a use method thereof, belonging to the technical field of steelmaking and refining.The refining slag comprises the following chemical compositions by weight percent: 85-95% of CaO, 2-10% of B2O3, 2-10% of MgO, 1-10% of Al2O3 and less than 5% impurities, wherein the content of harmful impurities such as sulfur, phosphorus and the like is as low as possible. The refining slag is prepared by using industrial reagents, namely active lime, boron anhydride, magnesia and aluminium ashto prepare, premelting at 1350-1450 DEG C, cooling, crushing to 2-10mm and performing moisture proof packaging. The slag series can be used for the refining and slag forming of LF, RH and CAS and therefining slag is added in steel ladle in the process of argon blowing after the molten steel preliminary deoxidation and the reduction treatment of the residue of steel ladle. The refining slag of the invention has strong desulphurizing and dephosphorizing abilities and no pollution, the slag inclusion generated through absorption and deoxidation has higher ability, the deoxidation effect of steel is improved, the spreadability is good, the suction and oxidation of the molten steel are reduced, the refining devices do not adhere to slag, the preparation process is simple, and the product is easy to store and use.

Description

technical field [0001] The invention relates to a fluorine-free pre-melted ladle refining slag with ultra-high alkalinity and a preparation method and a use method thereof, which belong to the field of refining outside a steelmaking furnace and are suitable for slagging refining process in a ladle. Background technique [0002] With the development of social economy, users put forward higher and higher requirements for the quality of steel products. As an important production process in the modern steelmaking process, extra-furnace refining plays a pivotal role in the entire steel production process. Among many refining processes, synthetic slag refining has the functions of desulfurization, dephosphorization, deoxidation and absorption of inclusions in steel, and has been widely used and developed. [0003] At present, the refining slag outside the steelmaking furnace mainly includes the following basic series: CaO-CaF 2 Slag system; CaO-Al 2 o 3 Slag system; CaO-Al 2 o...

Claims

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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
Owner JIANGSU UNIV
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