Acid-resistant spray coating suitable for globe roof of hot-blast stove

A technology of spraying paint and hot blast furnace, which is applied in the field of refractory materials, can solve the problems of poor high-temperature performance, reduced strength, and high Na content, and achieve the effects of stable volume, increased strength, and accelerated polycondensation reaction

Active Publication Date: 2021-09-07
中冶武汉冶金建筑研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the water glass bonded material will decrease after being corroded by acid, and the Na content in the water glass is high, and the high temperature performance is not good.

Method used

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  • Acid-resistant spray coating suitable for globe roof of hot-blast stove
  • Acid-resistant spray coating suitable for globe roof of hot-blast stove
  • Acid-resistant spray coating suitable for globe roof of hot-blast stove

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]An acid-resistant spray paint suitable for the dome of a hot blast stove. The components and their mass percentages are: mullite aggregate 53%, 70 high alumina powder 21%, α-Al 2 o 3 Micropowder 4%, quartz powder 3%, kyanite particles 4%, sodium carboxymethyl starch 0.4%, magnesium oxide 1.2%, amino-modified silane coupling agent 0.5%, modified quick-drying silica sol 12.9%.

[0043] According to the above formula, the two-component spray paint (powder and binder) is packaged and transported to the construction site, the powder and a small amount of binder are mixed and stirred evenly, and then sent to the sprayer, and the remaining silica sol is added at the position of the gun mouth and adjusted to Appropriate addition amount, use the semi-dry spraying method to spray the top part of the hot blast stove. The performance test results of the acid-resistant spray paint obtained in Example 1 are shown in Table 1.

[0044] Table 1

[0045]

Embodiment 2

[0047] An acid-resistant spray paint suitable for hot blast stove domes, the components and their mass percentages are: mullite aggregate 57%, 70 high alumina powder 16.2%, α-Al 2 o 3 Micropowder 6%, quartz powder 5%, kyanite particles 2%, propylene glycol alginate 0.3%, magnesium oxide 0.8%, amino-modified silane coupling agent 0.4%, modified quick-drying silica sol 12.3%.

[0048] According to the above formula, the two-component spray paint (powder and binder) is packaged and transported to the construction site, the powder and a small amount of binder are mixed and stirred evenly, and then sent to the sprayer, and the remaining silica sol is added at the position of the gun mouth and adjusted to Appropriate addition amount, use the semi-dry spraying method to spray the top part of the hot blast stove. The performance test results of the acid-resistant spray paint obtained in Example 2 are shown in Table 2.

[0049] Table 2

[0050]

[0051]

Embodiment 3

[0053] An acid-resistant spray paint suitable for hot blast furnace domes, the components and their mass percentages are: mullite aggregate 52%, 70 high alumina powder 21.7%, α-Al 2 o 3 Micropowder 5%, quartz powder 4%, kyanite particles 3%, sodium carboxymethyl starch 0.5%, magnesium oxide 1%, amino-modified silane coupling agent 0.3%, modified quick-drying silica sol 12.5%.

[0054] According to the above formula, the two-component spray paint (powder and binder) is packaged and transported to the construction site, the powder and a small amount of binder are mixed and stirred evenly, and then sent to the sprayer, and the remaining silica sol is added at the position of the gun mouth and adjusted to Appropriate addition amount, use the semi-dry spraying method to spray the top part of the hot blast stove. The performance test results of the acid-resistant spray paint obtained in Example 3 are shown in Table 3.

[0055] table 3

[0056]

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Abstract

The invention discloses an acid-resistant spray coating suitable for a globe roof of a hot blast stove. The acid-resistant spray coating comprises the following components in percentage by mass: 50 to 65 wt% of mullite aggregate, 16 to 25 wt% of 70 high aluminum powder, 3 to 6 wt% of alpha-Al2O3 micro powder, 2 to 6 wt% of quartz powder, 1 to 4 wt% of kyanite particles, 0.1 to 0.6 wt% of a tackifier, 0.5 to 2 wt% of a curing agent, 0.2 to 0.6 wt% of an accelerant and 10 to 13 wt% of modified quick-drying silica sol. According to the semi-dry spray coating with the silica sol as a binding agent, substances with low melting point are not brought in, and the high-temperature performance is ensured. The polycondensation reaction of silica sol siloxane bonds can be promoted in an acid environment, the strength is not reduced but also improved after acid erosion, the surface layer is intact, the sign of erosion does not occur, and the service life of the hot blast stove is prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an acid-resistant spray paint suitable for the dome of a hot blast stove. Background technique [0002] At present, the structure of domestic hot blast stoves mostly adopts the top combustion type, and the air supply temperature can reach 1250-1300°C. The combustion chamber is located at the top area of ​​the hot blast stove, which makes the top temperature of the hot blast stove higher, which can reach above 1350°C. In the actual production process, a large amount of nitrogen oxides will be formed in the furnace roof. When the temperature drops, it will combine with condensed water to form acidic substances, which will cause intergranular stress corrosion on the furnace shell, causing the furnace shell to be thinned and damaged by acid erosion. In severe cases, the production of the hot blast stove will be stopped. Therefore, the refractory protective l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185
CPCC04B35/66C04B35/185C04B2235/3217C04B2235/3418C04B2235/3463C04B2235/5427C04B2235/5436C04B2235/3206C04B2235/483C04B2235/9615C04B2235/96C04B2235/77
Inventor 刘会永丛培源胡进项冰
Owner 中冶武汉冶金建筑研究院有限公司
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