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Cast-molded sliding plate brick for slag stopping of converter tapping hole and production method

A technology of pouring molding and sliding bricks, which is applied in the field of refractory materials, can solve the problems that the integrity cannot meet the long-term use requirements, the complexity of the production process increases, affects the integrity and service life, etc., and achieves improved volume stability and high temperature strength Excellent, anti-flaking effect

Active Publication Date: 2021-04-09
HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the service life of the inlaid zirconium plate slide plate is longer than that of the conventional fired aluminum-zirconium carbon slide plate, and the service life is mostly stable at 15-18 furnaces, but the complexity of the production process increases, and the zirconium plate needs to be inlaid with fire clay.
At the same time, the cost of production has also increased significantly
In addition, in the later stage of use, on the one hand, the oxidative strength of the jacket is easy to decrease, and on the other hand, the volume of the fire clay between the zirconium plate and the jacket and the fire clay for the box will shrink, which will easily cause air movement and breakage between the zirconium plate and the jacket, seriously affecting the integrity and service life. , because the integrity cannot meet the long-term use requirements, the zirconium plate cannot fully exert its excellent properties such as corrosion resistance, erosion resistance, and long life.
At the same time, the hidden dangers of unsafety have increased, and more stringent requirements have been put forward for the sliding nozzle and mechanism operators and judges. At present, it has not been widely promoted.

Method used

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  • Cast-molded sliding plate brick for slag stopping of converter tapping hole and production method
  • Cast-molded sliding plate brick for slag stopping of converter tapping hole and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A cast-molded sliding brick for slag-stopping converter taphole, the raw materials are composed of 65% tabular corundum, 12% magnesium-rich spinel, 7% silicon carbide, and 10% alpha - Alumina micropowder, 1% pure calcium aluminate cement, 5% ρ-alumina micropowder, plus 0.05% water reducing agent of the total amount of the above raw materials.

[0033] Among them, the weight ratio of different particle sizes of tabular corundum is: particle size 1: particle size 2: particle size 3: particle size 4: particle size 4 = 10:25:15:10:5; particle size of magnesium-rich spinel ≤ 0.013mm; pure alumina The particle size of calcium cement is ≤0.045mm; the particle size of silicon carbide is ≤1mm; the particle size of α-alumina powder is D50=0.25μm, and the model is CL370; the specific surface area of ​​ρ-alumina powder is 200m 2 / g, particle size ≤ 5 μm; the superplasticizers are high-efficiency organic superplasticizers FS10 and FW10 purchased from BASF, Germany, and the dosage ra...

Embodiment 2

[0041] A pouring-molded sliding brick for slag-stopping converter taphole, the raw materials are composed of 70% tabular corundum, 10% magnesium-rich spinel, 5% silicon carbide, and 8% alpha - Alumina micropowder, 1% pure calcium aluminate cement, 6% ρ-alumina micropowder, plus 0.05% water reducer of the total amount of the above raw materials.

[0042]The weight ratio of different particle sizes of the tabular alumina is: particle size 1: particle size 2: particle size 3: particle size 4: particle size 5=15:20:15:15:5.

[0043] The production method of this skateboard brick is with embodiment 1.

Embodiment 3

[0045] A pouring-formed sliding brick for slag-stopping converter taphole. The raw materials are composed of 78% tabular corundum, 8% magnesium-rich spinel, 3% silicon carbide, and 6% alpha - Alumina micropowder, 2% pure calcium aluminate cement, 3% ρ-alumina micropowder, plus 0.05% water reducer of the total amount of the above raw materials.

[0046] The weight ratio of different particle sizes of the tabular alumina is: particle size 1: particle size 2: particle size 3: particle size 4: particle size 5=10:25:20:13:10.

[0047] The production method of this skateboard brick is with embodiment 1.

[0048] Product performance analysis of the present invention

[0049] The performance of the skateboard tile (embodiment 1-3) of the present invention is tested, and the results are shown in Table 2 below.

[0050]

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Abstract

The invention provides a cast-molded sliding plate brick for slag stopping of a converter tapping hole. The cast-molded sliding plate brick is prepared from the following raw materials: 65-78% of tabular corundum, 8-12% of magnesium-rich spinel, 3-7% of silicon carbide, 6-10% of alpha-aluminum oxide micro powder, 1-2% of pure calcium aluminate cement, 3-6% of rho-aluminum oxide micro powder and 0.05-0.2% of a water reducing agent. During production, the raw materials and the water reducing agent are weighed, stirring is conducted by a stirrer to obtain pug, pouring and vibration molding are carried out, after 24h of curing, demoulding is conducted, drying treatment is performed at 300+ / -10DEG C, and then grinding and coating are conducted to obtain the product. The sliding plate brick is excellent in integrity, good in erosion resistance, stripping resistance and thermal shock resistance, high in strength and good in use performance.

Description

technical field [0001] The invention relates to a cast-formed sliding brick for slag-stopping a converter tap hole and a production method, belonging to the technical field of refractory materials. Background technique [0002] With the change of steel consumption structure, the special steel produced by converter has attracted the attention of many enterprises. The quality of the slag blocking effect of the converter has a direct impact on the quality of the steel. The slag blocking technology of the converter sliding plate has the characteristics of quick response to the slag blocking operation and high slag blocking efficiency. It is a new technology for the slag blocking of the converter. Used in ladle smelting. However, the special smelting environment of the converter, especially the production of high value-added products such as IF steel, oil pipeline steel, bearing steel, spring steel, etc., puts forward more stringent requirements on the tap hole slide. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C21C5/46
CPCC04B35/101C21C5/4653C04B2235/3826C04B2235/3222C04B2235/77C04B2235/96C04B2235/9607
Inventor 梁保青李爱梅赵臣瑞徐跃庆李宏宇尚俊利张志峰王全喜郭立志关斌斌
Owner HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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