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

A technology of electroslag remelting and rotor steel, applied in the field of electroslag special metallurgy, which can solve the problems of high energy consumption, high fluorine slag volatilization pollution, etc.

Active Publication Date: 2021-05-18
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-low fluorine slag system and its use method for electroslag remelting of B-contai...

Method used

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

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preparation example Construction

[0056] On the other hand, the present invention provides a method for preparing medium-low fluorine slag system, comprising the following steps:

[0057] Step 1: For commercially pure CaF 2 After high-temperature baking, it is ready for use;

[0058] 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;

[0059] Step 3: heating and melting the melting point of the prepared slag system to obtain a molten slag product;

[0060] Step 4: Sprinkle water on the produced molten slag product, cool it, and break it into 3-6mm massive pre-melted slag for later use.

[0061] It should be noted that in the above step 1, considering factors such as the processing, production, and transportation of industrial raw materials, the industrially pure CaF2 is baked at a high temperature of 851-900°C for 2-4 hours for use in order to remove Moisture and imp...

Embodiment 1

[0074] This embodiment provides a medium-low 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 : 33.20%, Al 2 o 3 : 43.79%, CaO: 19.50%, MgO: 3%, B 2 o 3 : 0.5%; the rest are impurities, among which SiO 2 The mass percentage content of ≤0.5%.

[0075] The basic physical properties of the slag system in this example are: melting point 1352°C, density range 2.70-2.71g / cm at 1700-1800°C 3 , the viscosity is 0.016~0.021Pa·s, and the conductivity range is 1.23~1.62S / cm.

[0076] The preparation method of the slag system comprises the steps of:

[0077] 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 860°C for 3 hours and set aside for use to remove moisture and impurities;

[0078] Step 2: Use commercially pure CaF 2 , CaO, Al 2 o 3 , MgO, B...

Embodiment 2

[0088] This embodiment provides a medium-low 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 : 39.30%, Al 2 o 3 : 34.02%, CaO: 22.68%, MgO: 3%, B 2 o 3 : 1%; the rest is impurities, among which SiO 2 The mass percentage content of ≤0.5%.

[0089] The basic physical properties of the slag system in this example are: melting point 1333°C, density range 2.67-2.69g / cm at 1700-1800°C 3 , the viscosity is 0.011~0.015Pa·s, and the conductivity range is 1.92~2.31S / cm.

[0090] The preparation method of the slag system comprises the steps of:

[0091] 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 860°C for 3 hours and set aside for use to remove moisture and impurities;

[0092] Step 2: Use commercially pure CaF 2 , CaO, Al 2 o 3 , MgO, B 2...

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Abstract

The invention relates to a medium-low fluorine slag system for electroslag remelting of a B-containing rotor steel ingot and a using method, belongs to the technical field of electroslag special metallurgy, and aims to solve the problems that an existing B-containing electroslag melting slag system is high in energy consumption and high-fluorine slag volatilizes to cause pollution. The medium-low fluorine slag system comprises the components in percentage by mass: 30.06%-39.30% of CaF2, 34.02%-43.79% of Al2O3, 18.31%-22.72% of CaO, 3%-5% of MgO, 0.10%-3.50% of B2O3 and the balance impurities, wherein the content of SiO2 in the impurities is less than 0.5%, and the range of CaO/(SiO2 + 0.5 * Al2O3) is from 0.7 to 1.4. The medium-low fluorine slag system reduces volatilization pollution of high-fluorine slag, and is low in power consumption during use and good in comprehensive metallurgical performance.

Description

technical field [0001] The invention relates to the technical field of electroslag special metallurgy, in particular to a medium-low fluorine slag system used for electroslag remelting of B-containing rotor steel ingots and a method for using the same. 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 lev...

Claims

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Application Information

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IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 林腾昌杨勇李龙飞姚同路崔怀周梁强赵吉庆何西扣刘正东杨刚
Owner CENT IRON & STEEL RES INST
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