Preparation method of iron and steel refining slag system
A preparation method and technology of refining slag, which is applied in the field of iron and steel smelting, can solve the problems of poor fluidity of slag, single slag material, and high complete melting temperature, and achieve the effects of reducing smelting energy consumption, improving fluidity, and optimizing adsorption
Active Publication Date: 2021-12-14
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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Problems solved by technology
In this process stage, in order to ensure that the composition of molten steel meets the technical requirements of Si≤0.10% and Al≤0.010%, it is forbidden to use deoxidizers containing aluminum and silicon such as aluminum powder and silicon-calcium powder in the whole process of vacuum carbon deoxidation process, so that In the molten steel refining process, the slag is relatively single. In the prior art, the slag is lime and fluorite at a ratio of 3:1 to 4:1, and only C powder is used as a deoxidizer.
As a result, the existing slag ratio has led to the following defects in the prior art: the slag has a high melting point, and its complete melting temperature is as high as about 2067°C; at 1600°C, the liquid-solid ratio is 1.76, and the slag has poor fluidity, which is not conducive to molten steel deoxidation and the adsorption of inclusions; and the energy consumption of smelting is high, the average power consumption per ton of steel is about 235KW h; the measured value of total oxygen T[O] is as high as 21ppm; the number density of inclusions in steel ingots is 4.6 pieces / mm 2
[0003] The technical problems existing in the preparation method of iron and steel refining slag system in the prior art are: high melting point of slag system; poor fluidity of slag; high smelting energy consumption, etc.
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[0039] In the first embodiment, add in molten steel: lime (CaO content is 95%) 2400kg (that is, material-to-steel ratio w 20 / 1000), fluorite (CaF 2 The content is 87%, SiO 2 The content is 10%) 1000kg (that is, the material-to-steel ratio w8.33 / 1000), and the aluminum particles are 90kg (ie, the material-to-steel ratio is w0.75 / 1000). The ratio of lime to fluorspar is 2.4:1. CaF in this slag system 2 The design content is 22%.
[0040] The complete melting temperature of the final slag sampled in smelting is 1789.5°C. Sampling of forgings, the measured value of total oxygen is 14ppm, and the number density of inclusions is 3.04 pieces / mm 2 . The power consumption of the refining furnace per ton of steel is 195kw•h.
[0041] In the second embodiment, add in molten steel: lime (CaO content is 95%) 2000kg (that is, material-to-steel ratio w 16.67 / 1000), fluorite (CaF 2 The content is 87%, SiO 2 The content is 10%) 1100kg (that is, the material-to-steel ratio w9.17 / 1000), ...
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The invention provides a method for preparing a steel refining slag system, which comprises: lime, fluorite and aluminum particles to form a slag system of calcium oxide-calcium fluoride-silicon dioxide-alumina. Accordingly, the beneficial effect achieved by the present invention is that in the iron and steel refining process, adding relevant ores to molten steel according to this formula can reduce the The melting point of the slag system improves the fluidity of the slag, further optimizes the deoxidation of molten steel and the adsorption of inclusions, and reduces the energy consumption of smelting.
Description
technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for preparing iron and steel refining slag. Background technique [0002] In the prior art, the vacuum carbon deoxidation process of low-pressure rotor steel refers to the use of carbon powder for deoxidation in the refining and reduction process. In this process stage, in order to ensure that the composition of molten steel meets the technical requirements of Si≤0.10% and Al≤0.010%, it is forbidden to use deoxidizers containing aluminum and silicon such as aluminum powder and silicon-calcium powder in the whole process of vacuum carbon deoxidation process, so that In the molten steel refining process, the slag is relatively single. In the prior art, the slag is lime and fluorite at a ratio of 3:1 to 4:1, and only C powder is used as a deoxidizer. As a result, the existing slag ratio has led to the following defects in the prior art: the slag has a high melting po...
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IPC IPC(8): C21C7/06C21C7/076
CPCC21C7/06C21C7/076Y02P10/20
Inventor 杨海石孙颜辉朱伟伟闫抒宇王志刚卓超
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD