Medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingot and use method

A technology for electroslag remelting and rotor steel, applied in the field of electroslag special metallurgy, can solve the problems of high fluorine slag volatilization pollution and high energy consumption, and achieve the effects of reducing volatilization pollution, good surface quality and easy arc starting

Active Publication Date: 2021-04-30
CENT IRON & STEEL RES INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above analysis, the embodiment of the present invention aims to provide a medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingots and its use method to solve the high energy consumption of the existing B-containing electroslag smelting slag system And the problem of volatilization pollution of high fluorine slag

Method used

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  • Medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingot and use method
  • Medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingot and use method
  • Medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingot and use method

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preparation example Construction

[0055] In another aspect, the present invention provides a method for preparing medium-high fluorine slag system, comprising the following steps:

[0056] Step 1: For commercially pure CaF 2 After high-temperature baking, it is ready for use;

[0057] Step 2: Use commercially pure CaF 2 , CaO, Al 2 o 3 , MgO, B 2 o 3 Prepare the slag system according to the mass percentage of the target slag system composition, and dry it for later use;

[0058] Step 3: heating and melting the melting point of the prepared slag system to obtain a molten slag product;

[0059] Step 4: Sprinkle water on the produced molten slag product, cool it, and break it into 8-15mm massive pre-melted slag for later use.

[0060] It should be noted that, in the above-mentioned step 1, considering factors such as environmental humidity may exist in the processing, production and transportation of industrial raw materials, it is necessary to use industrially pure CaF 2 Baking at a high temperature of 8...

Embodiment 1

[0073] This example provides a medium-high fluorine slag system for electroslag remelting of B-containing rotor steel ingots. The mass percentage of each component in the slag system is: CaF 2 ; 40.26%, Al 2 o 3 : 33.99%, CaO; 22.25%, MgO: 3%, B 2 o 3 : 0.5%, the rest is impurities; SiO in impurities 2 The mass percentage content of <0.5%.

[0074] The basic physical properties of the slag in this example are: melting point 1331°C, density range 2.67-2.70g / cm at 1600°C-1800°C 3 , the viscosity is 0.011~0.021Pa·s, and the conductivity range is 1.58~2.36S / cm.

[0075] The preparation method of the slag system comprises the steps of:

[0076] Step 1: Considering factors such as the processing, production, and transportation of industrial raw materials that may have a humid environment, the industrially pure CaF 2 Bake at 820°C for 3 hours for later use, in order to remove moisture and impurities;

[0077] Step 2: Use commercially pure CaF 2 , CaO, Al 2 o 3 , MgO, B 2 ...

Embodiment 2

[0087] This example provides a medium-high fluorine slag system for electroslag remelting of B-containing 9Cr rotor steel ingots. The mass percentage of each component in the slag system is: CaF 2 ;46.79%, Al 2 o 3 : 23.56%, CaO; 24.15%, MgO: 5%, B 2 o 3 : 0.5%, the rest is impurities; SiO in impurities 2 The mass percentage content is <0.5%.

[0088] The basic physical properties of the slag in this example are: the melting point is 1327°C, and the density ranges from about 2.60 to 2.64g / cm at 1600°C to 1800°C. 3 , the viscosity is about 0.007~0.014Pa·s, and the conductivity range is 2.25~3.03S / cm.

[0089] The preparation method of the slag system comprises the steps of:

[0090] Step 1: Considering factors such as the processing, production, and transportation of industrial raw materials that may have a humid environment, the industrially pure CaF 2 Bake at 820°C for 3 hours for later use, in order to remove moisture and impurities;

[0091] Step 2: Use commercially...

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Abstract

The invention relates to a medium-high fluorine slag system for electroslag remelting of a B-containing rotor steel ingot and a use method, belongs to the technical field of electroslag special metallurgy, and is used for solving the problems of high energy consumption and high fluorine slag volatilization pollution of an existing B-containing electroslag remelting slag system. The medium-high fluorine slag system comprises the following components in percentage by mass: 40.26-46.79% of CaF2, 23.07-33.99% of Al2O3, 22.25-24.83% of CaO, 3-5% of MgO, 0.5-1.5% of B2O3 and the balance impurities, wherein SiO2 in the impurities is less than 0.5%. The medium-high fluorine slag system reduces the high fluorine slag volatilization pollution, and is low in power consumption and excellent in comprehensive metallurgical performance in use.

Description

technical field [0001] The invention relates to the technical field of electroslag special metallurgy, in particular to a medium-high fluorine slag system used for electroslag remelting of B-containing rotor steel ingots and a method for using it. Background technique [0002] China is the world's largest producer and consumer of electricity, and the proportion of thermal power generation in China is 70% to 80%. However, most thermal power units are generally inefficient, which not only causes energy waste, but also brings serious environmental pollution. Therefore, China urgently needs to vigorously develop high-efficiency power generation technologies, both from an economic point of view and from an environmental point of view. The method to improve power generation efficiency of power station includes two aspects: reasonable management technology and improving unit efficiency. Among them, the effective way to improve unit efficiency is to improve steam parameter level an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18B22D23/10
CPCC22B9/18B22D23/10
Inventor 林腾昌赵吉庆杨勇李龙飞何西扣姚同路崔怀周梁强刘正东杨刚
Owner CENT IRON & STEEL RES INST
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