Calcium oxide material for clean steel smelting and preparation method thereof

A technology for calcareous material and clean steel, applied in the field of calcic oxide material for clean steel smelting and its preparation, can solve the problems of unfavorable steel quality, increased phosphorus content, high oxygen supply potential, avoid hydration problem, strong adsorption effect of ability

Active Publication Date: 2014-12-03
SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the amount of water added during construction is about 20wt%, cracks and spalling often occur in the early stages of use, thereby increasing the amount of oxide inclusions in the steel
At the same time, in the continuous casting process, since mineral materials such as soft clay, silicon oxide powder, and sodium silicate are acidic oxides, they have a high oxygen supply potential to molten steel and will continue to increase the total oxygen content in molten steel; Phosphate minerals such as sodium tripolyphosphate used in the process of contacting molten steel will increase the content of phosphorus in steel, which is not conducive to the improvement of steel quality; moreover, the main chemical component of magnesia is magnesium oxide, which can affect the inclusion of molten steel The adsorption capacity is not strong
In short, the mineral composition and preparation process of existing tundish coatings can no longer meet the increasingly demanding needs of clean steel smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A calcium oxide material for clean steel smelting and a preparation method thereof. Mix 35~38wt% of limestone particles, 33~35wt% of limestone fine powder, 17~22wt% of magnesium-aluminum sol and 5~10wt% of mixture, stir evenly, smear or cast, and then get clean steel smelting Calcium oxide material.

[0025] The mixture is formed according to the mass ratio of alumina fine powder: magnesia fine powder: calcium lignosulfonate being 10: (3-4): (0.7-0.9).

Embodiment 2

[0027] A calcium oxide material for clean steel smelting and a preparation method thereof. Mix 38~40wt% of limestone particles, 30~33wt% of limestone fine powder, 12~17wt% of magnesium-aluminum sol and 10~15wt% of mixture, stir evenly, smear or cast, and then get clean steel smelting Calcium oxide material.

[0028] The mixed material is formed by mixing alumina micropowder:magnesia fine powder:calcium lignosulfonate in a mass ratio of 10:(4~5):(0.9~1.1).

Embodiment 3

[0030] A calcium oxide material for clean steel smelting and a preparation method thereof. Mix 38-40wt% limestone particles, 30-33wt% limestone fine powder, 8-12wt% magnesium-aluminum sol and 15-20wt% mixture, stir evenly, smear or cast, and get clean steel smelting Calcium oxide material.

[0031] The mixture is formed by mixing alumina micropowder:magnesite fine powder:calcium lignosulfonate in a mass ratio of 10:(3~4):(1.1~1.3).

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Abstract

The invention relates to a calcium oxide material for clean steel smelting and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: mixing 35-40 wt% of limestone particle, 30-35 wt% of limestone fine powder, 8-22 wt% of magnesium aluminum sol and 5-20 wt% of mixture, stirring uniformly, and painting or casting to form, thereby obtaining the calcium oxide material for clean steel smelting. The mixture is formed by mixing alumina micropowder, magnesite fine powder and calcium lignosulphonate in a mass ratio of 10:(3-5):(0.7-1.5); the particle size of the limestone particle is 7-0.1mm, the particle size of the limestone fine powder is 0.05-100 mu m, and the CaCO3 content of the limestone particle and limestone fine powder is greater than or equal to 92 wt%; and the mole ratio of magnesium to aluminum in the magnesium aluminum sol is 1:(0.4-2.2). The calcium oxide material has the advantages of low impurity content, proper strength and almost no influence on total oxygen content of molten steel, can adsorb oxide inclusions in the steel, and is suitable for preparing the working line of a tundish for clean steel smelting.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a calcium oxide material for clean steel smelting and a preparation method thereof. Background technique [0002] According to the requirements of innovation and development in the "12th Five-Year Plan" of the iron and steel industry, the state will increase the intensity of upgrading and development of special steel products, and strive to replace imports and meet the new market demand for the improvement of the domestic equipment manufacturing industry. Therefore, it is particularly important to strictly control the quality of molten steel in the process of iron and steel smelting. The tundish is the last container for molten steel before continuous casting of molten steel. The composition, structure and performance of the refractory material in its working layer are of great significance to ensure the quality of molten steel. [0003] Most of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 魏耀武叶昌松姜亚清
Owner SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD
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