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Lightweight high-strength refractory castable

A refractory castable, high-strength technology, applied in the field of refractory materials, can solve problems such as increased consumption, easy breakage, and fluctuations in the mechanical properties of castables, and achieve the effects of reducing heat loss, reducing bulk density, and improving high-temperature performance

Active Publication Date: 2021-12-17
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the heavy castable in the authorized publication number CN100408515C Chinese patent, this patent has the characteristics of light bulk density, good mechanical properties, and excellent thermal shock stability. It is prone to breakage, and the deterioration of aggregate performance not only leads to an increase in consumption, but also causes fluctuations in the mechanical properties of the castable. In addition, its thermal insulation performance needs to be further improved

Method used

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  • Lightweight high-strength refractory castable

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A light-weight high-strength refractory castable, its raw material composition and weight percentage content are: 25% light-weight high-strength microporous bauxite aggregate, 35% aluminum oxide hollow balls, 3% floating beads with a particle size of 200 mesh, and 3% with a particle size of 5% of 120 mesh kyanite powder, 6.88% of cooked bauxite fine powder with a particle size of 200 mesh, 8% of silicon micropowder with a particle size of ≤500 mesh, α-Al with a particle size of ≤500 mesh 2 o 3 Micropowder 9%, alumina cement 5%, refractory fiber 3%, composite water reducer 0.1%, commercially available RK-720F silicon polyether defoamer 0.02%.

[0035] Wherein, the light-weight high-strength microporous alumina aggregate is graded, specifically including light-weight high-strength microporous alumina aggregate with 15% by weight of 5mm≤particle size3 , the total porosity ≥ 65%, the average pore diameter of micropores ≤ 10μm.

[0036] The alumina hollow spheres are partic...

Embodiment 2

[0040] A light-weight high-strength refractory castable, its raw material composition and weight percentage content are: 30% light-weight high-strength microporous bauxite aggregate, 30% aluminum oxide hollow balls, 4% floating beads with a particle size of 180 mesh, and 4% with a particle size of 6% of 120 mesh kyanite powder, 5.32% of cooked bauxite fine powder with a particle size of 200 mesh, 6% of silicon micropowder with a particle size of ≤500 mesh, α-Al with a particle size of ≤500 mesh 2 o 3 Micro powder 8%, alumina cement 6.5%, refractory fiber 4%, composite water reducer 0.15%, commercially available RK-720F silicon polyether defoamer 0.03%.

[0041] Wherein, the light-weight high-strength microporous alumina aggregate is graded, specifically including light-weight high-strength microporous alumina aggregate with 15% by weight of 5mm≤particle size3 , the total porosity ≥ 65%, the average pore diameter of micropores ≤ 10μm.

[0042] The alumina hollow spheres are pa...

Embodiment 3

[0046] A light-weight high-strength refractory castable. Its raw material composition and weight percentage content are: 28% light-weight high-strength microporous bauxite aggregate, 25% aluminum oxide hollow balls, 5% floating beads with a particle size of 160 mesh, and 5% floating beads with a particle size of 80 mesh kyanite powder 6.82%, 180 mesh cooked bauxite fine powder 8%, silicon micropowder ≤500 mesh 6%, α-Al particle size ≤500 mesh 2 o 3 Micropowder 9%, alumina cement 7%, refractory fiber 5%, composite water reducer 0.15%, commercially available RK-720F silicon polyether defoamer 0.03%.

[0047] Wherein, the light-weight high-strength microporous alumina aggregate is graded, specifically including light-weight high-strength microporous alumina aggregate with 18% by weight of 5mm≤particle size3 , the total porosity ≥ 65%, the average pore diameter of micropores ≤ 10μm.

[0048] The alumina hollow spheres are graded, specifically including 17% by weight of alumina ho...

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Abstract

The invention discloses a lightweight high-strength refractory castable which comprises the following raw materials in percentage by weight: 25-35% of lightweight high-strength microporous alumina aggregate, 25-35% of alumina hollow spheres, 3-5% of floating beads, 5-8% of kyanite powder, 5-8% of calcined bauxite fine powder, 5-8% of silica powder, 6-9% of alpha-Al2O3 micro powder, 5-10% of alumina cement, 3-5% of refractory fibers, 0.1-0.3% of a composite water reducing agent and 0.02-0.05% of a water-based silicon polyether defoaming agent. The refractory castable can effectively reduce the water-cooling heat loss of a high-temperature water-cooling furnace roller of a thin slab continuous casting and rolling tunnel type heating furnace, improve the heat efficiency of the heating furnace and prolong the service life of a heat insulation layer of the furnace roller, and has the characteristics of stable performance, light volume weight, good mechanical property and excellent heat insulation performance and thermal shock resistance stability.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a lightweight high-strength refractory castable. Background technique [0002] The high-temperature water-cooled furnace rolls of the thin slab continuous casting and rolling tunnel-type heating furnace are responsible for supporting and driving the slab in the furnace. They work in a high-temperature environment with a temperature of 1100-1300 °C for a long time. The furnace rolls pass through four heat-resistant metal layers arranged on the outer wall. The roller ring is in direct contact with the slab to play a supporting and driving role. In order to ensure the high temperature strength of the furnace roller, a fire-resistant and heat-insulating protective layer is usually used between the metal roller rings, and water is passed inside the furnace roller for cooling to protect Furnace rollers, reduce water cooling heat loss and prolong service life. Due to the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/80C04B35/64C04B35/63C04B35/634C04B38/08
CPCC04B35/101C04B35/80C04B35/64C04B35/6303C04B35/634C04B35/63448C04B35/62204C04B38/08C04B2235/3463C04B2235/5228C04B2235/3418C04B2235/528C04B2235/5216C04B2235/5427C04B2235/77C04B2235/9607C04B38/0067
Inventor 罗巍刘义滔朱善合杜秀峰何金平丁翠娇欧阳德刚陈超
Owner 武汉钢铁有限公司
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