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Douring basket protecting slag for continuous casting and its prepn

A mold slag and tundish technology, which is applied in the field of continuous casting tundish mold slag and its preparation, can solve the problems of shortening the service life of refractory materials, losing the function of mold slag, and corroding lining plug rods, etc., and achieves strong adsorption and inclusion capacity, Solve the problem of lime hydration, good effect on labor protection

Inactive Publication Date: 2006-06-28
宜兴市苏派炉料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high potassium and sodium content, low viscosity and low melting point of this mold flux, it can only be used as mold flux and cannot be used in tundishes in high-temperature environments, and it will severely corrode lining, shroud and stopper rods. The service life of refractory materials is shortened, the insulation effect is relatively poor, and the melting speed is fast, which will cause the liquid surface to freeze steel and lose the function of mold slag
Furthermore, the mold flux is still a solid particle structure, and there are also defects of granular materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 1.233 tons of calcite with a content of 98%, 0.238 tons of super-grade bauxite, and 0.06 tons of iron ore concentrate powder with a content of 98% were electromelted and crushed into 250-mesh fine powder, and 15% of vaseline was added Stir the liquid evenly, add sodium polyacrylate and boric acid, make slurry with water, spray granulate and dry to make 0.1-1.5mm hollow spherical particles. Its chemical composition is shown in the attached table, and its bulk density is about 0.7g / cm 3 .

Embodiment 2

[0015] Example 2: 0.6 tons of lime with a content of 98% and 0.4 tons of super-grade bauxite were melted in a high-temperature kiln, crushed into 250-mesh fine powder, added 15% vaseline liquid and stirred evenly, and added sodium polyacrylate and boric acid to make water Slurry, spray granulation and drying to make 0.1-1.5mm hollow spherical particles. Its chemical composition is shown in the attached table, and its bulk density is about 0.7g / cm 3 .

Embodiment 3

[0016] Embodiment 3: use 18% of the raw material obtained in Example 1, add 82% graphite with a content of 98%, mix and make slurry, spray granulate and dry into hollow spherical particles, and its chemical composition is shown in the attached table.

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PUM

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Abstract

The present invention is pouring basket protecting slag for continuous casting and its preparation. The present invention features that the protecting slag is hollow grains comprising CaO 10-70 wt%, SiO2 0.5-30 wt%, Al2O3 3-50 wt%, MgO 0.4-20 wt%, C 0-85 wt%, with CaO / SiO2 ratio being 1.1-4.5. The preparation process includes mixing and pre-melting CaO, Al2O3 and iron powder to obtain base CaO material with activated surface film of Al2O3 and Fe; crushing the base material into fine powder; mixing with organic waterproof coating material to form waterproof film; adding the rest components to form slurry; and spray drying to form the hollow balls. The protecting slag of the present invention is superior to available double-layer protecting slag.

Description

technical field [0001] The invention relates to a tundish mold powder for continuous casting and a preparation method thereof. Background technique [0002] Tundish mold slag has thermal insulation, prevents oxidation of molten steel, absorbs inclusions, and purifies molten steel, so it is an important and indispensable auxiliary material in steelmaking. Existing tundish mold fluxes usually use acidic (CaO / SiO less than 1.0) or double-layered mold fluxes with a bottom layer of alkaline powdery material such as active lime or metallurgical lime and an upper layer of carbonaceous insulation material. However, the acid mold slag not only easily erodes the refractory material of the ladle, but also has poor ability to absorb inclusions, purify molten steel, and has poor metallurgical effect. Basic lime at the bottom layer and double-layer mold slag of carbonaceous material on the upper layer, the main defect is that the lime at the bottom layer is easy to hydrate, which will no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/10
Inventor 吴永来杨政宏周高贵黄振球
Owner 宜兴市苏派炉料科技有限公司
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