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Design method of refining slag system for removing magnesium aluminate spinel inclusions

A technology of magnesium aluminum spinel, design method, applied in the field of metallurgy

Active Publication Date: 2021-03-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing technical solutions fail to propose specific indicators for removing large-size magnesia-aluminum spinel inclusions based on the mechanism

Method used

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  • Design method of refining slag system for removing magnesium aluminate spinel inclusions
  • Design method of refining slag system for removing magnesium aluminate spinel inclusions
  • Design method of refining slag system for removing magnesium aluminate spinel inclusions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A plant produces aluminum deoxidation steel, using magnesium treatment in the absence of refining process, and generates inclusions mainly magnesium aluminum spinel. The main component of refinement is Al 2 O 3 -CAO-SIO 2 .

[0078] The relationship between the inclination z and time t is calculated by the following formula (1) - (8).

[0079] (1)

[0080] among them, Driving force, N; R The radius of inclusions, M; G is gravity acceleration, 9.81m / s 2 ; For fluid density, kg / m 3 ; - For the density of inclusions, kg / m 3 ;

[0081] (2)

[0082] among them, Feature viscosity, Pa • S; For the upper floating speed, m / s of the inclusions; F d The floating force of the inclusions is being treated by fluid drag, n; re is the number of conjunction of inclusions;

[0083] (3)

[0084] among them, F m In addition to quality, N; Acceleration, m / s for inclusive exercise 2 ;

[0085] (4)

[0086] among them, Interfacial resistance, n; In the interface, J; Z is...

Embodiment 2

[0109] With the same process conditions as in Example 1, the refined slag system is capable of absorbing a magnesium-aluminum spinel clutter having a radius greater than 10 μm, according to figure 2 The selected slag system has a range of less than 0.12 Pa • s, steel-slag clamp three-phase moisture angle cosine value COS θ is greater than 0.7, calculated that the surface tension coefficient of the corresponding refinement is less than 0.53 n / m. The first finishing slag component group corresponding to the viscosity corresponding to the FACTSAGE software is used as 20-35% Al. 2 O 3 , 55-60% Cao, 10-15% SiO 2 , According to the three-dimensional surface tension equivalent map ( image 3 ) The corresponding first finiterating slag component composition and the second fine-absorbing system component group becomes 10-40% alone. 2 O 3 , 50-80% Cao, 0-15% SiO 2 . Take the first refining residue component composition and the second fine scorpion system composition composition correspon...

Embodiment 3

[0111] The same algorithm as in Example 1 was used.

[0112] A plant produces low carbon steel, aluminum-magnesium composite oxygen in the refining process, and generates inclusions mainly magnesium aluminum spinel. The main component of refinement is Al 2 O 3 -CAO binary slag system. The size of the predetermined inclusions is 15 μm, and the inclusion to remove the physical properties of the inclusion by dynamic force analysis model. Figure 5 Indicated. The selected viscosity range is less than 0.09 Pa • S, steel-slag clamp three-phase moisture angle cosine value COSθ is 0.65-0.85, calculated that the surface tension coefficient of the corresponding refinement is from 0.55 to 0.8 N / m. The first fine scorpion component group corresponding to the slag-resistant viscosity was used to calculate or query the slag-induced viscosity. According to Al 2 O 3 -CAO dual residue surface tension characteristics, using equations (13) and (14) to calculate ingredients and surface tension rela...

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Abstract

The invention provides a design method of a refining slag system for removing magnesium aluminate spinel inclusions. The design method comprises the steps of establishing a motion model of the magnesium aluminate spinel inclusions, obtaining the relation between displacement and time of the magnesium aluminate spinel inclusions is obtained, and thus judging the state of the magnesium aluminate spinel inclusions; calculating required viscosity and interface characteristic conditions of the refining slag system when the inclusions with different sizes are removed; drawing a removal advantage region graph; obtaining the maximum size of the non-removed inclusions in steel according to steel type requirements, and selecting target slag viscosity and surface tension coefficients according to theremoval advantage region graph; and respectively calculating to obtain a first refining slag system component composition and a second refining slag system component composition according to the target slag viscosity and the surface tension coefficients, and taking an intersection of both compositions to determine a target refining slag system component composition. According to the design method, the slag system for efficiently removing the inclusions can be obtained.

Description

Technical field [0001] The present invention relates to the field of metallurgy, and more particularly to a design method for removing the refining slag system of magnesium aluminum spiked clutter. Background technique [0002] In addition to special requirements in the modern steelmaking process, most of the aluminum deoxidation is mostly used in the refining link, so the deoxidation products are mostly alumina. At the same time, due to the refining steel bag, the continuous casting intermediate package is used to use magnesium-tape-resistant materials, and the aluminum oxide clamps can be used to form magnesium aluminum splitte clutter. The inclusions have become one of the inclusions of inclusions under modern steelmaking process. . [0003] Mgal 2 O 4 The main shapes of the inclusions have spherical, cubic body shapes and irregularities, mostly in the steel matrix, and the melting point is easy to produce a production accident such as moisture tumor in the water outlet. The i...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 刘威杨树峰刘杰王田田杨曙磊赵朋赵梦静
Owner UNIV OF SCI & TECH BEIJING
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