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Refractory spray castable

A castable and refractory technology, which is applied in the field of refractory spray castables, can solve the problem that the adhesion performance and anti-scouring performance cannot meet the needs of pouring and repairing of thermal kiln lining, and cannot meet the needs of large-area and high-thickness repair work on the furnace roof. The problem of low shock performance can be achieved to enhance the acid and alkali corrosion resistance, improve the adhesion performance and bonding strength, and improve the thermal shock resistance.

Active Publication Date: 2010-06-23
WUHAN BOZE HIGH TEMPERATURE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low thermal shock performance of the bauxite aggregate under high temperature conditions, the bonding strength of the castable is still low under high temperature conditions, and it is easy to loosen, and the continuous construction performance of the castable is poor in the actual use process However, the adhesion performance and anti-scouring performance still cannot meet the needs of pouring and repairing of thermal kiln lining, especially the need for large-area and high-thickness repair work on the furnace roof.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The raw material composition and weight percentage of the refractory spray castable are: 25% of alumina particles, 5% of alumina fine powder, 5% of mullite particles, 20% of mullite fine powder, 19% of corundum fine powder, Calcium aluminate cement 1%, silica powder 2%, α-Al 2 o 3 Micropowder 10%, Cr 2 o 3 1% of micropowder, 10% of SiC powder, and 2.0% of composite admixture composed of sodium polyphosphate, heat-resistant steel fiber, sodium metasilicate and calcium hydroxide, wherein the alumina particles have a particle size of 6 to 3mm, 3 ~ 1mm and 1 ~ 0.1mm three particle gradations, the weight percentage of the above three particle gradations in the bauxite particles is 50%, 25% and 25% in turn, the particle size of the bauxite fine powder ≤0.088mm, the particle size of the corundum fine powder is ≤0.076mm.

[0021] Preparation process: weigh the above-mentioned raw materials according to the above-mentioned weight percentage, add them into the mixe...

Embodiment 2

[0023] Embodiment 2: The raw material composition and weight percentage of refractory injection castable are: 45% of alumina particles, 6% of alumina fine powder, 8% of mullite particles, 5% of mullite fine powder, 5% of corundum fine powder, Calcium aluminate cement 3%, silica powder 8%, α-Al 2 o 3 Micropowder 2%, Cr 2 o 3 7.9% of micropowder, 10% of SiC powder and 0.1% of composite admixture composed of sodium polyphosphate, heat-resistant steel fiber and calcium hydroxide, wherein, the alumina particles and alumina fine powder contain Al 2 o 3 The weight percentage content of the alumina particles is 60-75%. The alumina particles are composed of three particle gradations with particle sizes of 6-3mm, 3-1mm and 1-0.1mm respectively. The percentage by weight in is 40%, 45% and 15% successively, the particle size of described bauxite fine powder is ≤0.088mm, the particle size of described corundum fine powder is ≤0.076mm, and the particle size of described mullite is respe...

Embodiment 3

[0026] Example 3: The raw material composition and weight percentage of the refractory spray castable are: 25% of alumina particles, 20% of alumina fine powder, 10% of mullite particles, 6% of mullite fine powder, 10% of corundum fine powder, Calcium aluminate cement 15%, silica powder 2%, α-Al 2 o 3 Micropowder 3%, Cr 2 o 3 5% of fine powder, 2% of SiC powder and 2% of composite admixture composed of sodium polyphosphate, hydroxymethyl cellulose and calcium hydroxide, wherein the alumina particles and alumina fine powder contain Al2 o 3 The weight percent content of the bauxite is required to be 75-85%. The bauxite particles are composed of three particle gradations with particle sizes of 6-3mm, 3-1mm and 1-0.1mm respectively. The weight percentages in the particles are 40%, 30% and 30% in turn; the particle size of the alumina fine powder is ≤0.088mm, the corundum fine powder particle size is ≤0.076mm, and the mullite particles have a particle size of 6~ 3mm, 3~1mm and 1...

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Abstract

The present invention discloses a refractory spray castable. The castable comprises components of the following percentages by weight: 25 to 45% of alumina particle, 5 to 20% of alumina fine powder, 5 to 30% of mullite particle, 5 to 20% of mullite fine powder, 5 to 25% of corundum fine powder, 1 to 15% of calcium aluminate cement, 2 to 8% of micro silicon powder, 2 to 10% of micro alpha-Al2O3 powder, 1 to 10% of micro Cr2O3 powder, 2 to 10% of SiC powder and 0.1 to 2.5% of compound additive. The compound additive comprises a water reducing agent, an adhesive and an accelerating agent. Practice proves that the refractory spray castable has the advantages of good adhesion, small resilience rate, big thickness of die-free continuous construction, capability of on-line maintenance under proper construction conditions, good anti-corrosion properties and low manufacture and use cost.

Description

technical field [0001] The invention belongs to a refractory material for a thermal kiln, in particular to a refractory injection castable. Background technique [0002] At present, the thermal shock stability of the refractory materials used in thermal kiln linings such as sulfur incinerators and fluidized furnaces in the domestic sulfuric acid industry is poor, which not only makes the lining easily deformed after burning, severe thermal spalling, but also difficult to repair after the lining is loose. , the bonding strength between the repaired part and the remaining brickwork is low, which will easily lead to the furnace lining loosening again. There are problems such as short overhaul period of thermal kiln and high cost of refractory furnace lining, which seriously affects the normal turnover and allocation of thermal kiln. The Chinese patent with the patent number 03113433.5 introduces a component weight ratio as follows: primary bauxite aggregate < 5mm 65-60%, pri...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 潘波
Owner WUHAN BOZE HIGH TEMPERATURE NEW MATERIAL
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