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Calcium-magnesium-based aluminum-silicon molten steel purifier and preparation method thereof

A purification agent, magnesium-based aluminum technology, applied in the field of new metallurgical materials, can solve problems such as difficult absorption and removal, unstable treatment effect, etc., to achieve the effect of avoiding high melting point, avoiding incremental mismatch, and reducing control means

Active Publication Date: 2020-11-10
马鞍山中科冶金材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the existence of deoxidation product Al in the existing molten steel purification agent 2 o 3 Not easy to absorb and remove, unstable treatment effect and other defects, the present invention provides a new type of calcium-magnesium-based aluminum-silicon molten steel purifier, the calcium-magnesium pre-melted base material in the purifier is unsaturated sintered pre-melted type, its phase homogeneous, so the deoxidized product Al 2 o 3 It is easy to be captured and absorbed by unsaturated calcium magnesium pre-melted base material, and it also has a capture and adhesion effect on other types of deoxidation products of molten steel such as calcium silicate, so it can effectively purify molten steel and improve the effect and efficiency of molten steel purifying agent treatment process. stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Calcium-magnesium-based aluminum-silicon molten steel purification agent is prepared from pre-melted unsaturated calcium-magnesium pre-melted base material, metal aluminum, and metal silicon-calcium. The mass fraction of its components is: CaO: 35.7%, MgO: 8.2%, al 2 o 3 : 16.2%, Al: 22.4%, Si: 8.7%, Ca: 4.8%, and the balance is SiO 2 , Fe 2 o 3 , C and other impurities, the total amount of impurities is ≤5.0%, and the pre-melted unsaturated calcium-magnesium pre-melted base material is composed of CaO-containing materials and Al-containing materials 2 o 3 The material and the MgO-containing material are mixed in proportion and sintered and pre-melted. The CaO-containing material is lime, and the CaO in the lime is ≥ 90%, and the SiO 2 ≤3%, containing Al 2 o 3 The material is bauxite, and Al in the bauxite 2 o 3 ≥88%, Fe 2 o 3 ≤1.5%, MgO-containing material is magnesia, MgO in magnesia≥95%, SiO 2 ≤2.2%, the above are mass fractions. Contain CaO: 55.7%, MgO:...

Embodiment 2

[0048] Calcium-magnesium-based aluminum-silicon molten steel purifier is prepared from pre-melted unsaturated calcium-magnesium pre-melted base material, metal aluminum, and metal silicon-calcium. The mass fractions of its components are: CaO: 37.8%, MgO: 9.1%, Al 2 o 3 : 8.2%, Al: 35%, Si: 4.9%, Ca: 2.6%, and the balance is SiO 2 , Fe 2 o 3 , C and other impurities, the total amount of impurities is ≤5.0%, and the pre-melted unsaturated calcium-magnesium pre-melted base material is composed of CaO-containing materials and Al-containing materials 2 o 3 The material and the MgO-containing material are mixed in proportion and sintered and pre-melted. The CaO-containing material is lime, and the CaO in the lime is ≥ 90%, and the SiO 2 ≤3%, containing Al 2 o 3 The material is bauxite, and Al in the bauxite 2 o 3 ≥88%, Fe 2 o 3 ≤1.5%, MgO-containing material is magnesia, MgO in magnesia≥95%, SiO 2 ≤2.2%, the above are mass fractions. Containing CaO: 66.1%, MgO: 16.2%, ...

Embodiment 3

[0056] Calcium-magnesium-based aluminum-silicon molten steel purifier is prepared from pre-melted unsaturated calcium-magnesium pre-melted base material, metal aluminum and metal silicon-calcium. The mass fraction of its components is: CaO: 49.2%, MgO: 4.8%, Al 2 o 3 : 29.1%, Al: 7%, Si: 3.8%, Ca: 2.6%, and the balance is SiO 2 , Fe 2 o 3 , C and other impurities, the total amount of impurities is ≤5.0%, and the pre-melted unsaturated calcium-magnesium pre-melted base material is composed of CaO-containing materials and Al-containing materials 2 o 3 The material and the MgO-containing material are mixed in proportion and sintered and pre-melted. The CaO-containing material is lime, and the CaO in the lime is ≥ 90%, and the SiO 2 ≤3%, containing Al 2 o 3 The material is bauxite, and Al in the bauxite 2 o 3 ≥88%, Fe 2 o 3 ≤1.5%, MgO-containing material is magnesia, MgO in magnesia≥95%, SiO 2 ≤2.2%, the above are mass fractions. Containing CaO: 56.7%, Al 2 o 3 : 33...

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Abstract

The invention discloses a calcium-magnesium-based alumina-silica molten steel purifier and a preparation method thereof, and belongs to the field of novel materials for metallurgy. The calcium-magnesium-based alumina-silica molten steel purifier is prepared from a pre-molten type unsaturated calcium-magnesium pre-molten matrix, metallic aluminum, metallic silicon and calcium. The calcium-magnesium-based alumina-silica molten steel purifier comprises, by mass, 35.7-50.6% of CaO, 2.8-12.1% of MgO, 8.2-29.1% of Al2O3, 7-35% of Al, 0-8.7% of Si, 0-4.8% of Ca, and the balance impurities including SiO2, Fe2O3 and C, and the total amount of the impurities is no more than 5.0%. Deoxidized products generated in the molten steel purifying process and other deoxidized inclusions at the early stage ofmolten steel can be effectively absorbed and then discharged along with slag, meanwhile, nodulizing denaturating treatment is carried out on a very few residual miniature fragile inclusions, a meltedliquid slag system exists in the molten steel purifying process, and thus the phenomena that the melting point of an original molten steel purifier formed by mixing aluminum oxide or calcium aluminate and metallic aluminum is high, and caking and incomplete melting are resulted in the molten steel purifying process are completely avoided.

Description

technical field [0001] The invention belongs to the field of new metallurgical materials, and more specifically relates to an unsaturated calcium-magnesium-based aluminum-silicon molten steel purifier and a preparation method thereof. Background technique [0002] Molten steel purifying agent is a metallurgical material used on specific steel types in the steelmaking process. In order to make molten steel meet certain quality requirements in the steelmaking process, it is often necessary to add molten steel purifying agent to treat molten steel. For example, molten steel deoxidized by aluminum deoxidizer is a molten steel purifier mixed with aluminum oxide or calcium aluminate material and metal aluminum. As a result, the product of deoxidizing molten steel is Al 2 o 3 , and increase the content of Als (acid-soluble aluminum) in steel while deoxidizing. This type of molten steel purifier has its inherent defects, one is the deoxidation product Al 2 o 3 It is not easy to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 陈来祥
Owner 马鞍山中科冶金材料科技有限公司