Low-cost magnesium-silicon based castable for tundish prefabricated component and preparation method thereof

A tundish and low-cost technology, applied in the field of refractory materials, can solve the problems of low yield, unstable performance and high product price, and achieve the effects of lower cost and price, stable performance and improved slag resistance

Active Publication Date: 2014-12-10
SHANGHAI LIER REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the CN101913888A document titled "Castables for Forsterite Tundish Slag Retaining Walls and Its Production" published on December 15, 2010, a kind of intermediate made of forsterite, magnesia and corundum is disclosed. Including slag retaining wall technology, many refractory companies have done a lot of research on this aspect, but due to the low yield and unstable performance, it is only used in a small area, and the product price is still high

Method used

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preparation example Construction

[0033] A method for preparing a castable for a low-cost magnesium siliceous tundish prefabricated part, comprising the following steps:

[0034] a. Take magnesia olive sand, magnesia, silicon micropowder, silicon carbide, sodium tripolyphosphate, sodium hexametaphosphate and organic fiber, and set aside;

[0035] The MgO content of the magnesia olive sand ≥ 45%, Fe 2 o 3 Content ≤ 9%, sintered magnesia with magnesia MgO content ≥ 95%, silicon carbide is primary silicon carbide or regenerated silicon carbide with SiC content ≥ 90%, silicon micropowder is SiO 2 Content ≥ 94%, organic fiber length 3-5mm, melting point 15-170°C;

[0036] b. Grind the raw material of magnesia olive sand finely, and classify it into five different particle sizes of 30-10mm, 6-3mm, 3-1mm, 1-0mm and 100 mesh, and set it aside; grind the magnesia sand into fine powder, and classify Grind silicon carbide into fine powder with a particle size of ≤200 mesh and prepare it for later use;

[0037] c. Acc...

Embodiment 1

[0043] A method for preparing a castable for a low-cost magnesium siliceous tundish prefabricated part, comprising the following steps:

[0044] a. Take magnesia olive sand, magnesia, silicon micropowder, silicon carbide, sodium tripolyphosphate, sodium hexametaphosphate and organic fiber, and set aside;

[0045] b. Grind the raw material of magnesia olive sand finely, and classify it into five different particle sizes of 30-10mm, 6-3mm, 3-1mm, 1-0mm and 100 mesh, and set it aside; grind the magnesia sand into fine powder, and classify Grind silicon carbide into fine powder with a particle size of ≤200 mesh and prepare it for later use;

[0046] c. According to weight percentage, take 30% of magnesia olive sand of 6-3mm, 35% of magnesia olive sand of 3-1mm, 11% of magnesia olive sand of 1-0mm, 5% of magnesia olive sand of 100 mesh, and magnesia of 1-0mm 5%, 200 mesh magnesia 10%, SiC1.75%, silica powder 2%, sodium tripolyphosphate 0.1%, sodium hexametaphosphate 0.05% and orga...

Embodiment 2

[0051] A method for preparing a castable for a low-cost magnesium siliceous tundish prefabricated part, comprising the following steps:

[0052] a. Take magnesia olive sand, magnesia, silicon micropowder, silicon carbide, sodium tripolyphosphate, sodium hexametaphosphate and organic fiber, and set aside;

[0053] b. Grind the raw material of magnesia olive sand finely, and classify it into five different particle sizes of 30-10mm, 6-3mm, 3-1mm, 1-0mm and 100 mesh, and set it aside; grind the magnesia sand into fine powder, and classify Grind silicon carbide into fine powder with a particle size of ≤200 mesh and prepare it for later use;

[0054] c. According to weight percentage, take 25% of magnesia olive sand of 6-3mm, 25% of magnesia olive sand of 3-1mm, 15% of magnesia olive sand of 1-0mm, 8% of magnesia olive sand of 100 mesh, and magnesia of 1-0mm 8%, 200 mesh magnesia 11.5%, SiC3%, silicon micropowder 4%, sodium tripolyphosphate 0.15%, sodium hexametaphosphate 0.1% and...

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Abstract

The invention relates to a low-cost magnesium-silicon based castable for a tundish prefabricated component and a preparation method thereof. According to the invention, magnesium olivine sand, magnesia, silica powder, silicon carbide, sodium tripolyphosphate, sodium hexametaphosphate and organic fiber are used as raw materials. High content of the magnesium olivine sand raw-material is adopted, thus reducing the dosage of magnesia. The price of the magnesium olivine sand raw-material is low and is only 1 / 3-1 / 2 of the price of magnesia. Therefore, the cost of the castable product is reduced greatly. In addition, when the dosage of magnesium olivine sand and magnesia is adjusted, granularity of the raw materials magnesium olivine sand and magnesia is changed. Thus, a tundish prefabricated component prepared from the castable still can be endowed with advantages of high strength, anti-explosion performance and the like.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a casting material for a low-cost magnesium-silicon tundish prefabricated part and a preparation method thereof. Background technique [0002] With the downturn of the entire steelmaking industry in recent years, especially since 2011, the pressure of refractory market competition is increasing, and the profit margin of products is gradually shrinking. The survival of refractory manufacturers has been severely challenged. At present, many of the tundish prefabricated parts produced by domestic refractory manufacturers still use high-cost high-alumina, corundum and aluminum-magnesium prefabricated parts. With the increase in demand for clean steel, the transformation of tundish prefabricated parts to alkaline materials has been promoted. Magnesium prefabricated parts have been greatly developed in recent years, and have certain advantages in price. However, with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 邹新国朱永军汪正峰颜浩李洪波
Owner SHANGHAI LIER REFRACTORY MATERIAL
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