Refractory castable used for steel ladle and preparation method thereof

A technology of refractory castables and ladles, applied in the field of refractory materials, can solve the problems of low strength of castables and unstable pores, and achieve the effects of low thermal conductivity, good thermal shock stability and high apparent porosity

Inactive Publication Date: 2018-05-18
黎文泰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent uses microcellular foam and adds it to the castable to increase the porosity of the castable. The resulting pores are unstable and the castable has low strength.

Method used

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  • Refractory castable used for steel ladle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A refractory castable for a ladle is made of the following raw materials in parts by weight:

[0028] 40 parts of microporous corundum aggregate, 10 parts of M60 mullite, 10 parts of diatomite, 3 parts of attapulgite clay, 30 parts of 70 cement, 1 part of silicon carbide, and 5 parts of silicon micropowder; plus 0.2% of the total weight of the above raw materials water reducer and polypropylene fibers accounting for 0.03% of the total weight of the above raw materials, the particle size of the microporous corundum aggregate is 1-5 mm, the pore size is 0.5-1.2 μm, the apparent porosity is 4-10%, and the bulk density is 2 -3.2g / cm 3 .

[0029] The preparation method of the microporous corundum aggregate is as follows: 70 parts of γ-Al 2 o 3 Fine powder, 12 parts of MgO fine powder, 1 part of α-Al 2 o 3 nanopowder and 0.5 parts CaCO 3 Fine powder, ball milled evenly, then add 15 parts of Suzhou clay and 0.3 parts of water reducer, dry at 100°C for 20 hours, and then ...

Embodiment 2

[0040] A refractory castable for a ladle is made of the following raw materials in parts by weight:

[0041] 42 parts of microporous corundum aggregate, 15 parts of M70 mullite, 13 parts of diatomite, 3.2 parts of attapulgite clay, 30 parts of 925 cement, 1.6 parts of silicon carbide, and 6 parts of silicon micropowder; plus 0.2% of the total weight of the above raw materials water reducer and polypropylene fibers accounting for 0.05% of the total weight of the above raw materials, the particle size of the microporous corundum aggregate is 1-5mm, the pore size is 0.5-1.2μm, the apparent porosity is 4-10%, and the bulk density is 2 -3.2g / cm 3 .

[0042] The preparation method of the microporous corundum aggregate is as follows: 72 parts of γ-Al 2 o 3 Micropowder, 10 parts of MgO micropowder, 1.2 parts of α-Al 2 o 3 Nanopowder and 0.6 part CaCO 3 Fine powder, ball milled evenly, then add 16 parts of Suzhou clay and 0.4 parts of water reducer, dry at 110°C for 16 hours, and...

Embodiment 3

[0053] A refractory castable for a ladle is made of the following raw materials in parts by weight:

[0054] 45 parts of microporous corundum aggregate, 16 parts of M60 mullite, 14 parts of diatomite, 4 parts of attapulgite clay, 31 parts of 70 cement, 2.5 parts of silicon carbide, and 9 parts of silicon micropowder; plus 0.3% of the total weight of the above raw materials water reducer and polypropylene fibers accounting for 0.06% of the total weight of the above raw materials, the microporous corundum aggregate has a particle size of 1-5mm, a pore size of 0.5-1.2μm, an apparent porosity of 4-10%, and a bulk density of 2 -3.2g / cm 3 .

[0055] The preparation method of the microporous corundum aggregate is as follows: 73 parts of γ-Al 2 o 3 Fine powder, 13 parts of MgO fine powder, 1.3 parts of α-Al 2 o 3 nanopowder and 0.5 parts CaCO 3 Fine powder, ball milled evenly, then add 17 parts of Suzhou clay and 0.5 parts of water reducer, dry at 100°C for 18 hours, and then si...

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Abstract

The invention belongs to the technical field of refractory materials, in particular to a refractory castable used for steel ladle and a preparation method thereof. The refractory castable is preparedfrom the following raw materials in parts by weight: 40-60 parts of micropore corundum aggregate, 10-30 parts of mullite, 10-20 parts of kieselguhr, 3-5 parts of attapulgite clay, 30-40 parts of cement, 1-5 parts of silicon carbide, 5-15 parts of silica powder, water reducer and polypropylene fiber, wherein the water reducer occupies 0.2-0.5% of total mass of the above raw materials, and the polypropylene fiber occupies 0.03-0.1% of total mass of the above raw materials; the particle size of the micropore corundum aggregate is 1-5mm, the bore diameter of the micropore corundum aggregate is 0.5-1.2mu m, the apparent porosity of the micropore corundum aggregate is 4-10%, and the volume density of the micropore corundum aggregate is 2-3.2g / cm<3>. The refractory castable disclosed by the invention has the advantages of low thermal conductivity, proper apparent porosity, high intensity, light weight and high thermal shock stability.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory castable for a ladle and a preparation method thereof. Background technique [0002] At present, refractory materials are widely used in ladle lining materials. During the molten steel refining process, refractory materials are easily eroded and infiltrated by slag, cracking, and even peeling off. The short service life is only about 1 year, and the existing refractory castables are thermally conductive. A high coefficient often leads to a large amount of heat loss, and the temperature of the molten steel drops rapidly, which affects the quality of the billet. [0003] The Chinese patent with the notification number CN105236995B discloses a lightweight corundum-spinel castable and a preparation method thereof. The technical solution is: use 60~75wt% equal-diameter microporous corundum balls as aggregate, 8~12wt% fused white corundum fine pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/101C04B35/622C04B35/63C04B35/634
CPCC04B35/101C04B35/622C04B35/6303C04B35/63404C04B38/08C04B2235/3206C04B2235/3208C04B2235/3418C04B2235/3463C04B2235/349C04B2235/3826C04B2235/6022C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B2235/9607C04B38/0074C04B38/0067C04B38/0054
Inventor 黎文泰
Owner 黎文泰
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