Flame-resistant corrosion-resistant coating

A coating and corrosion-resistant technology, applied in the field of fire-resistant and corrosion-resistant coatings, can solve the problems that have not been seen before, and achieve the effects of reducing surface porosity, good thermal shock resistance and high purity

Active Publication Date: 2012-12-12
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no product that can resist the corrosion of a higher concentration of fluoride volatiles or hydrogen fluoride atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o3 Content 99.5wt%, Al of calcined alumina micropowder 2 o 3 Content ≥ 99.6wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%, phosphoric acid is 85% concentrated phosphoric acid blended into 30% phosphoric acid solution.

[0037] Sintered tabular corundum fine powder particle size 0mm-0.045mm 30%;

[0038] Magnesium aluminum spinel fine powder particle size 0mm-0.045mm 5%;

[0039] Calcined а-Al 2 o 3 Micro powder (average particle size less than 30um) 40%;

[0040] Sodium hexametaphosphate 0.15%;

[0041] Pure calcium aluminate cement 2%;

[0042] Phosphoric acid solution (30%) 22.85%;

[0043] In this example, sintered tabular corundum fine powder, magnesium aluminum spinel fine powder, calcined а-Al 2 o 3 Micropowder, sodium hexametaphosphate, and pure calcium aluminate cement are premixed in the mixer for 3 to 5 minutes, then add ...

Embodiment 2

[0045] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o 3 Content 99.5wt%, Al of calcined alumina micropowder 2 o 3 Content ≥ 99.6wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%, phosphoric acid is 85% concentrated phosphoric acid blended into 40% phosphoric acid solution.

[0046] Sintered platy corundum fine powder, particle size 0mm-0.045mm 36%;

[0047] Magnesium aluminum spinel fine powder particle size 0mm-0.045mm 3%;

[0048] Calcined а-Al 2 o 3 Micropowder (average particle size less than 30um) 43%;

[0049] Sodium hexametaphosphate 0.15%;

[0050] Pure calcium aluminate cement 1%;

[0051] Phosphoric acid solution (40%) 16.85%;

[0052] In this example, sintered tabular corundum fine powder, magnesium aluminum spinel fine powder, calcined а-Al 2 o 3 Micropowder, sodium hexametaphosphate, and pure calcium aluminate cement are premixed in the mixer for 3 to 5 minutes, then add ...

Embodiment 3

[0054] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o 3 Content 99.5wt%, Al of calcined alumina micropowder 2 o 3 Content ≥ 99.6wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%, phosphoric acid is 85% concentrated phosphoric acid blended into 40% phosphoric acid solution.

[0055] Sintered platy corundum fine powder, particle size 0mm-0.045mm 45%;

[0056] Magnesium aluminum spinel fine powder particle size 0mm-0.045mm 2%;

[0057] Calcined а-Al 2 o 3 Micro powder (average particle size less than 30um) 40%;

[0058] Sodium hexametaphosphate 0.15%;

[0059] Pure calcium aluminate cement 2%;

[0060] Phosphoric acid solution (60%) 10.85%;

[0061] In this example, sintered tabular corundum fine powder, magnesium aluminum spinel fine powder, calcined а-Al 2 o 3 Micropowder, sodium hexametaphosphate, and pure calcium aluminate cement are premixed in the mixer for 3 to 5 minutes, then add...

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Abstract

The invention discloses a flame-resistant corrosion-resistant coating. The flame-resistant corrosion-resistant coating is an amorphous flame-resistant corrosion-resistant coating for protecting the surface of a liner of an industrial furnace. The flame-resistant corrosion-resistant coating is characterized in that fine powder of tabular corundum and magnesium aluminate spinel, calcined alpha-Al2O3 micro-powder, pure calcium aluminate cement as a curing agent, sodium hexametaphosphate as a sintering assistant, and a phosphoric acid or aluminum dihydrogen phosphate solution as a binder are blended into the flame-resistant corrosion-resistant coating. The flame-resistant corrosion-resistant coating can resist corrosion produced by a high-concentration fluoride and a high-concentration hydrogen fluoride atmosphere, and has the advantages of high purity, good heat stability, application convenience, smooth and compact surface and relatively low cost. The flame-resistant corrosion-resistantcoating is suitable for the surface of a liner of a furnace with fluorides and a hydrogen fluoride atmosphere and also is suitable for the surface of a liner of a high-temperature and low-oxygen content furnace with a strong reduction atmosphere.

Description

technical field [0001] The invention relates to a refractory and corrosion-resistant coating, which relates to an unshaped refractory and corrosion-resistant coating for protecting the lining surface of industrial furnaces and kilns. Background technique [0002] Refractory coatings are often used on the lining surface of industrial furnaces such as heating furnaces, soaking furnaces, thermal power plant boilers, and metal heat treatment furnaces. Erosion, improve the life of the lining material. In addition, the bright white refractory coating can also improve the heat radiation ability of the dark lining material, improve the thermal efficiency and the uniformity of the temperature in the furnace. For kilns with cracks, broken blocks, and falling off linings, the use of refractory coatings can make the lining more sealed and heat-resistant, reduce the heat loss of the kiln, increase the heating speed and yield, and also increase the overhaul cycle of the kiln. save costs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 杨建红包生重李致远李旺兴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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