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A Mold Mold Flux for Preventing Slag Entrainment and Its Application

A mold powder and mold powder technology are applied in the field of using mold powder during continuous casting and steel casting, and can solve problems such as insufficient adsorption capacity to prevent slag entrainment, inability to prevent slag entrainment, etc.

Active Publication Date: 2022-01-14
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main problems is the prevention of slag entanglement and insufficient adsorption capacity, and the most critical is the inability to prevent slag entanglement of molten steel in the mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] To prevent mold slag from being entrapped in the mold, the slag is produced according to the technical plan and the important components of the components in the technical description.

[0029] 1. Mold slag incoming material. According to 36% Si 2 O, 10% Al 2 o 3 , and 35.5% CaO, 2.5% MgO, 5.5% Na 2 O and 6.5% F (from CaF 2 ), LiO 2 0.7%, TiO 2 BaO is 1.5%, BaO is 0.8%, and elemental carbon is 1%. Among them, CaO and Al 2 o 3 Wollastonite can be used as an incoming material source. SiO2 can use quartz sand as the source of incoming materials, MgO magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared.

[0030] 2. Mechanically mix the premelted material prepared above with magnesia to form a tundish mold slag that prevents mold slag from being entrained. The composition of the prepared mold flux in the overall components is shown in the following table.

[0031] ...

Embodiment 2

[0034] 1. Mold slag incoming material. According to 41% Si 2 O, 5% Al 2 o 3 , and 36% CaO, 1.5% MgO, 4.5% Na 2 O and 7% F (from CaF 2 ), LiO 2 0.5% TiO 2 2%, BaO 1.3%, and 1.2% elemental carbon for the proportioning of components. Among them, CaO and Al 2 o 3 Wollastonite can be used as an incoming material source. SiO 2 Quartz sand can be used as the source of incoming materials, MgO magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared.

[0035] 2. Mechanically mix the premelted material prepared above with magnesia to form a tundish mold slag that prevents mold slag from being entrained. The composition of the prepared mold flux in the overall components is shown in the following table.

[0036] CaO+MgO SiO 2 +Al 2 o 3

[0037] 3. The three parts of raw materials are mixed, pelletized, calcined and granulated according to the designed components, and then p...

Embodiment 3

[0039] 1. Mold slag incoming material. According to 38% Si 2 O, 8% Al2O3, and 35% CaO, 3% MgO, 6% Na2O and 5% F (source CaF 2 ), LiO 2 0.35%, TiO 2 2.5%, BaO 1.5%, and 1.1% elemental carbon for the proportioning of components. Among them, CaO and Al 2 o 3 Wollastonite can be used as an incoming material source. SiO 2 Quartz sand can be used as the source of incoming materials, MgO magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared.

[0040] 2. Mechanically mix the premelted material prepared above with magnesia to form a tundish mold slag that prevents mold slag from being entrained. The composition of the prepared mold flux in the overall components is shown in the following table.

[0041] CaO+MgO SiO 2 +Al 2 o 3

[0042] 3. The three parts of raw materials are mixed, pelletized, calcined and granulated according to the designed components, and then processe...

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PUM

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Abstract

The invention discloses a mold slag for preventing slag entrainment, comprising the following components in mass percentage: CaO+MgO: 34.0-39.0%, SiO 2 +Al 2 O 3 : 39.0‑48.0%, Na 2 O+F: 5.0‑13.0%, LiO 2 : 0.25‑0.7%, TiO 2 : 1.0‑2.5%, BaO: 0.5‑1.5%, F.c: 0.9‑1.2%, R: 0.80‑1.3. In the present invention, part of the component SiO in molten steel is used 2 +Al 2 O is promoted as a whole to increase the viscosity of the mold flux. Avoid SiO 2 To increase the viscosity and at the same time increase the oxidation of the liquid slag. At the same time, the reduction of Fc is reduced, and the appropriate liquid melting layer can quickly flow the liquid mold slag after the molten steel adsorption into the mold shell, so as to avoid long-term adsorption of alumina to deteriorate the performance of the liquid slag. The mold slag of the present invention can effectively prevent molten steel from entraining slag in the continuous casting process.

Description

technical field [0001] The invention relates to the application field of continuous casting auxiliary materials in continuous steel casting machines, in particular to the use of mold slag in the continuous casting steel pouring process. Background technique [0002] In the continuous casting process, mold slag is a synthetic auxiliary material added to the crystallizer and covered on the surface of molten steel during the continuous casting of molten steel. It will contain CaO, SiO 2 Raw materials, Al2O3, fluoride and Na + The material is mixed with slag in a suitable proportion, melted at high temperature to make pre-melted powder, and then mixed with a certain amount of carbon (Carbon, referred to as C) material and various additives, mixed and dried. [0003] Mold slag mainly plays the functions of lubrication, heat insulation, prevention of secondary oxidation, and adsorption of inclusions in molten steel. A four-layer structure of powder slag layer, sintered layer, ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 赵显久姜立新唐惠中
Owner BAOSHAN IRON & STEEL CO LTD