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Castable for reducing atmosphere kiln

A castable and kiln technology, applied in the field of refractory materials, can solve problems such as wasting energy and affecting normal production, and achieve the effects of avoiding abnormal looseness, high resistance to CO erosion, and strong room temperature hardening ability

Inactive Publication Date: 2019-03-22
LUOYANG KECHUANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the furnace lining is seriously damaged, the furnace must be stopped for repairs, which not only wastes energy, but also affects the normal production

Method used

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  • Castable for reducing atmosphere kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Castable formula for reducing atmosphere kiln:

[0030] Component Particle Size Weight Content

[0031] Pyrophyllite clinker 5-3mm 28%

[0032] Andalusite 3-1mm 22%

[0033] Andalusite 1-0mm 17%

[0034] Tabular alumina 325 mesh 18.45%

[0035] Ammann CA270 cement 325 mesh 0.5%

[0036] Hydrated alumina 20μm 3%

[0037] α-alumina fine powder 3μm 5%

[0038] Zirconium silicon powder 2μm 6%

[0039] Explosion-proof fiber 0.05%

[0040] CASTAMENT FS20 0.1%.

[0041] The main physical and chemical indicators of the castable for the reducing atmosphere kiln in this embodiment are:

[0042] Chemical Composition: Al 2 o 3 56.1%, SiO 2 42.6%, Fe 2 o 3 0.36%;

[0043] Matrix mineral phase composition: After firing at 1450°C, the matrix XRD results show that the main crystal phase is mullite;

[0044] Thermal Shock Resistance: Water cooling at room temperature, 56 thermal shocks.

[0045] Resistance to CO erosion: The test standard adopts the American "Test Met...

Embodiment 2

[0047] Castable formula for reducing atmosphere kiln:

[0048] Component Particle Size Weight Content

[0049] Pyrophyllite clinker 5-3mm 30%

[0050] Andalusite 3-1mm 20%

[0051] Andalusite 1-0mm 17%

[0052] White corundum 325 mesh 19.39%

[0053] Ammann CA670 cement 325 mesh 1%

[0054] Hydrated alumina 20μm 2.5%

[0055] α-alumina fine powder 3μm 4%

[0056] Zirconium silicon powder 2μm 6%

[0057] Explosion-proof fiber 0.03%

[0058] CASTAMENT FS20 0.08%.

[0059] The main physical and chemical indicators of the castable for the reducing atmosphere kiln in this embodiment are:

[0060] Chemical Composition: Al 2 o 3 55.2%, SiO 2 43.3%, Fe 2 o 3 0.37%;

[0061] Matrix mineral phase composition: After firing at 1450°C, the matrix XRD results show that the main crystal phase is mullite;

[0062] Thermal Shock Resistance: Water cooling at room temperature, 53 thermal shocks.

[0063] Resistance to CO erosion: The test standard adopts the American "Test Met...

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Abstract

The invention specifically relates to a castable for a reducing atmosphere kiln. The castable is prepared from low iron pyrophyllite clinker, low iron andalusite and high-purity corundum as main raw materials, and calcium aluminate cement-hydrated alumina-silica micropowder is used as a composite bonding agent. The castable has higher room temperature hardening performance and higher high-temperature strength. The thermal shock performance of the castable is improved greatly through zirconia in the silica powder. The raw materials used in the castable have low iron content and higher CO corrosion resistance, so that a furnace liner can be effectively prevented from getting tremendously loose, and the service life of the reducing atmosphere kiln is prolonged greatly.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a casting material for reducing atmosphere furnaces. Background technique [0002] At present, the lining of many high-temperature kilns is built with clay bricks and high-alumina bricks. The typical characteristics of high-alumina bricks and clay bricks are high iron content, which is not suitable for kilns with a reducing atmosphere in the furnace because: When the furnace lining refractory encounters a reducing CO atmosphere at high temperature, on the one hand, Fe 2 o 3 Will be gradually reduced to Fe or Fe by CO gas 3 C, on the other hand, due to the decomposition of CO, free C will be deposited around the metallic iron in the material, making the lining structure very loose or even cracked. In the process of use, the strong erosion of high-temperature flue gas and the fluctuation of furnace temperature will cause large-scale peeling off of the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185
CPCC04B35/185C04B35/66C04B2235/9669C04B2235/9607C04B2235/5208C04B2235/3244C04B2235/3418C04B2235/349C04B2235/3222C04B2235/3218C04B2235/3217C04B2235/3208
Inventor 马军强
Owner LUOYANG KECHUANG NEW MATERIAL CO LTD
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