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Nano-carbon-containing refractory castable for desulfurization stirrer and preparation method of nano-carbon-containing refractory castable

A refractory castable and nano-carbon technology, applied in the field of refractory materials, can solve problems such as restricting large-scale popularization and application, high price of chopped carbon fibers, cumbersome dispersion process, etc., and achieve performance improvement, preparation method optimization, and raw material composition optimization. Effect

Pending Publication Date: 2020-09-22
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chopped carbon fiber is expensive and the dispersion process is cumbersome, which restricts the large-scale application of this technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: A kind of refractory castable for desulfurization agitator containing nano-carbon, is made up of base material component and external component, each raw material component and its mass percentage in the base material are:

[0040] Ordinary fused mullite, 10mm≤particle size<20mm, 18%;

[0041] Ordinary fused mullite, 5mm≤particle size<10mm, 15%;

[0042] Ordinary fused mullite, 3mm≤particle size<5mm, 12%;

[0043] Pure fused mullite, 1mm≤particle size<3mm, 5%;

[0044] Pure fused mullite, 0.1mm≤particle size<1mm, 5%;

[0045] Pure fused mullite, 325 mesh, 5%;

[0046] Andalusite, 1mm≤particle size<3mm, 10%;

[0047] Andalusite, 0.1mm≤particle size<1mm, 8%;

[0048] Dense corundum fine powder, 325 mesh, 5%;

[0049] α-Al 2 o 3 Micronized powder, 7%;

[0050] Silica powder, 5%;

[0051] Pure calcium aluminate cement, 5%.

[0052] Among them, the pure fused mullite of 325 mesh and 0.1mm≤particle size<1mm is pure fused mullite coated with nano-carbo...

Embodiment 2

[0060] Embodiment 2: A refractory castable for a desulfurization mixer containing nano-carbon, consisting of a base material component and an additional component, each raw material component and its mass percentage in the base material are:

[0061] Ordinary fused mullite, 10mm≤particle size<20mm, 18%;

[0062]Ordinary fused mullite, 5mm≤particle size<10mm, 15%;

[0063] Ordinary fused mullite, 3mm≤particle size<5mm, 12%;

[0064] Pure fused mullite, 1mm≤particle size<3mm, 5%;

[0065] Pure fused mullite, 0.1mm≤particle size<1mm, 5%;

[0066] Pure fused mullite, 325 mesh, 5%;

[0067] Andalusite, 1mm≤particle size<3mm, 10%;

[0068] Andalusite, 0.1mm≤particle size<1mm, 8%;

[0069] Dense corundum fine powder, 325 mesh, 5%;

[0070] α-Al 2 o 3 Micronized powder, 7%;

[0071] Silica powder, 5%;

[0072] Pure calcium aluminate cement, 5%.

[0073] Among them, the pure fused mullite with 325 mesh and 0.1mm≤particle size<1mm is pure fused mullite coated with nano-carbon...

Embodiment 3

[0074] Embodiment 3: A kind of refractory castable for desulfurization mixer containing nano-carbon, is made up of base material component and external component, and each raw material component and its mass percentage in the base material are:

[0075] Ordinary fused mullite, 10mm≤particle size<20mm, 18%;

[0076] Ordinary fused mullite, 5mm≤particle size<10mm, 15%;

[0077] Ordinary fused mullite, 3mm≤particle size<5mm, 12%;

[0078] Pure fused mullite, 1mm≤particle size<3mm, 5%;

[0079] Pure fused mullite, 0.1mm≤particle size<1mm, 5%;

[0080] Pure fused mullite, 325 mesh, 5%;

[0081] Andalusite, 1mm≤particle size<3mm, 10%;

[0082] Andalusite, 0.1mm≤particle size<1mm, 8%;

[0083] Dense corundum fine powder, 325 mesh, 5%;

[0084] α-Al 2 o 3 Micronized powder, 7%;

[0085] Silica powder, 5%;

[0086] Pure calcium aluminate cement, 5%.

[0087] Among them, the 325-mesh pure fused mullite is pure fused mullite coated with nano-carbon film, and the 325-mesh dense...

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Abstract

The invention discloses a nano-carbon-containing refractory castable for a desulfurization stirrer. The castable comprises raw materials with the particle size being 1 mm or above, raw materials withthe particle size being larger than or equal to 0.1 mm and smaller than 0.1 mm and raw materials with the particle size being smaller than 0.1 mm. The raw materials with the particle size being smaller than 0.1 mm are prepared from pure fused mullite with the particle size being 325 mesh and dense corundum fine powder with the particle size being 325 mesh. The 325-mesh pure fused mullite and the 325-mesh dense corundum fine powder are carbon film nano-coated pure fused mullite and carbon film nano-coated dense corundum fine powder respectively. The invention also discloses a preparation methodof the castable. According to the castable disclosed by the invention, the thermal shock stability and the slag and molten iron erosion penetration resistance of the castable are improved, so that the castable is good in comprehensive performance and low in raw material cost, and a prepared stirrer is long in service life and low in consumption cost.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for desulfurization pretreatment of molten iron in molten iron tanks, and in particular relates to a refractory castable for a desulfurization agitator containing nano-carbon and a preparation method thereof. Background technique [0002] At present, the agitator used in KR stirring desulfurization of molten iron at home and abroad is composed of a stirring metal core and a refractory lining. Among them, the commonly used refractory material for the agitator lining is steel fiber reinforced mullite refractory castable. The main refractory raw material is high-purity fused mullite. The physical and chemical properties are roughly as follows: Chemical composition: Al 2 o 3 ≥60%, SiO 2 30~35%; physical properties: compressive strength 110℃×24h≥24Mpa, 1500℃×3h≥60Mpa, bulk density 110℃×24h≥2.6g / cm 3 、1500℃×3h≥2.5g / cm 3 ; After burning, the line change is ±0.5% at 1500℃×3h. Due to the ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185B01F7/00
CPCC04B35/66C04B35/185C04B2235/422C04B2235/5454C04B2235/3217C04B2235/96C04B2235/3463C04B2235/9676C04B2235/5212C04B2235/5216B01F27/053
Inventor 欧阳德刚杨新泉沈继胜朱万军罗巍孙伟杨成威邓品团刘婳
Owner 武汉钢铁有限公司
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