Cogged ingot continuous casting crystallizer protecting slag and preparation method thereof

A continuous casting crystallizer and mold slag technology, applied in the field of iron and steel smelting

Inactive Publication Date: 2009-08-12
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on mold powder for bloom continuous casting mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of mold powder for bloom continuous casting mold of the present invention comprises the following steps:

[0032] (1) Prepare the basic slag required for the preparation of mold flux premelt by weight percentage SiO 2 30-35%, CaO 25-30%, MgO 2.5-3.5%, Fe 2 o 3 1.5-2.5%, Al 2 o3 3.5-4.5%, carry out batching, stirring, pelletizing, drying in the air, so that the moisture content of pellets is ≤4%.

[0033] (2) After melting the ball forming material, water quenching is carried out, and the particle size is controlled at ≤5cm.

[0034] (3) drying the water-quenched material obtained in the above step (2) until the water content is ≤1%, ball milling, and the grinding particle size is less than 150 mesh to obtain mold slag premelt.

[0035] (4) Mix mold slag premelt, auxiliary materials, and carbonaceous materials in proportion, add binder, mix evenly in a conical agitator, and water mill to make slurry; when slurry is transported, the working p...

Embodiment 1

[0062] Example 1: Bloom 27SiMn Continuous Casting Slab Mold Mold Flux

[0063] The main chemical composition of the pre-melted hollow particle mold powder is in weight percentage, and the balance is binder and water.

[0064] solid carbon

(carbon black and graphite

Weight ratio 1:2)

12

SiO 2

33

CaO

29

MgO

3.5

Fe 2 o 3

2.0

Al 2 o 3

4.5

Na 2 O+K 2 o

6.5

NaF 2 +CaF 2

5.5

[0065] The preparation method comprises the following steps:

[0066] (1) Prepare the basic slag required for the preparation of mold flux premelt by weight percentage SiO 2 33%, CaO 29%, MgO3.5%, Fe 2 o 3 2.0%, Al 2 o 3 4.5%, batching, stirring, pelletizing, and drying to make the moisture content of pellets ≤ 4%.

[0067] (2) After melting the pelletized material, water quenching is carried out, and the particle size is controlled at ≤5cm. Red material or powder ash is not al...

Embodiment 2-4

[0072] Examples 2-4, the preparation method is the same as that of Example 1, the difference is that the weight percentages of the main chemical components of the mold flux ingredients are as follows:

[0073]

[0074] The balance is granulation binder and moisture etc.

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Abstract

The invention relates to a cogged ingot continuous casting mold powder, belonging to the iron and steel smelting technical field. The mold powder comprises the following chemical components with the weight percent of 30-35 percent of SiO2, 25-30 percent of CaO, 2.5-3.5 percent of MgO, 1.5-2.5 percent of Fe2O3, 3.5-4.5 percent of Al2O3, 4.5-5.5 percent of NaF2+CaF2, 5.5-6.5 percent of Na2O+K2O, 11-14.5 percent of solid carbon, and the rest is binder used for pelleting and water. A preparation method of the mold powder is also provided by the invention. The mold powder is exclusively applied to the cogged ingot continuous casting mold powder, in particular to cogged ingot 27SiMn continuous casting mold. The zero defect production of continuous casting can be realized, the hot delivery and hot charging of the continuous casting can be guaranteed, the systematic energy consumption from the continuous casting to rolled products can be lowered, the production cycle from the continuous casting slab to the rolled products can be shortened, and the quality of steels can be ensured.

Description

technical field [0001] The invention relates to mold slag for continuous casting of blooms and belongs to the technical field of iron and steel smelting. technical background [0002] In order to improve the quality of continuous casting slab and the production efficiency of continuous casting machine, domestic and foreign steel mills have done a lot of research work on the production and application technology of mold powder in recent years, and achieved remarkable results. The production practice of domestic and foreign steel mills has proved that the performance of continuous casting mold powder has an important impact on the surface and internal quality of continuous casting slabs and the production efficiency of continuous casting machines. In addition to isolating air to prevent secondary oxidation of molten steel and insulating molten steel, mold powder can also control the heat flow of the mold and the friction between the wall of the mold and the solidification shel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 何庆文王广连申景霞张鹏李猛梁建国刁峰
Owner SHANDONG IRON & STEEL CO LTD
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