A kind of silica sol combined with wet spraying material

A technology of wet spraying and silica sol, which is applied in the field of unshaped refractory materials, can solve the problems of increased voids, reduced molar volume, and rebound of large particles, so as to prevent the expansion of micro-cracks, improve various properties, and improve fracture toughness. Effect

Active Publication Date: 2018-10-09
中冶武汉冶金建筑研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The castable construction is relatively simple and the construction period is shortened, but due to the difficulties in mold support and vibration construction, it is difficult to apply to the maintenance of this part
The dry and semi-dry spraying process has the following defects because the spray paint and water or binder cannot be mixed uniformly in advance: 1. The water reducing agent in the spray paint cannot fully react with water or binder, and the water reducing effect is not ideal. The amount of liquid added is large; 2. The sprayed layer is a stacked layer of liquid and material alternately stacked, it is difficult to form a homogeneous body and easy to cause layered peeling; 3. During the construction process, the large particle material rebounds, the fine powder material scatter, and the original particle The gradation design is destroyed; 4. The critical particle size is small, the strength of the sprayed layer is low, and the thermal shock stability is poor; 5. The dust is flying and the construction environment is poor
If the heating rate is too fast during this period, the water vapor in the furnace lining cannot be discharged immediately, and it will accumulate in the furnace lining to generate steam pressure, causing the furnace lining to crack
2. When the temperature rises to about 800°C to 1000°C, the calcium aluminate hydrate in the cement is dehydrated and decomposed, and the hydration bond is destroyed; at the same time, the low-density hydrate is transformed into a high-density hydrate, and the molar volume The shrinkage and the increase of the gap lead to low structural strength of the furnace lining at this working temperature, poor thermal shock stability, and easy to be corroded by alkali metals and slag.
[0005] At present, there is no available technical solution that successfully solves the above technical problems and is suitable for the above conditions. Good adhesion, low rebound rate, fast baking, high medium temperature strength, wear resistance, good thermal shock stability, and good construction performance spray material

Method used

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  • A kind of silica sol combined with wet spraying material
  • A kind of silica sol combined with wet spraying material
  • A kind of silica sol combined with wet spraying material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A silica sol combined wet spraying material, which is composed of main raw materials and external components; the main raw materials and their mass percentages are: corundum granules 70%, corundum powder 25%, alumina micropowder (≤2μm 2%, ≤5μm 3%) 5%. The mass percentages of additional components and the total mass of the above-mentioned main raw materials are: retarder (dextrin) 0.4% (that is, the amount of dextrin added is 0.4% of the total mass of corundum granules, corundum powder and alumina micropowder), Dispersant (polyethylene glycol polycondensate 0.7%, sodium hexametaphosphate 0.8%) 1.5%, coagulant (aluminum chloride saturated solution) 0.5%, silica sol 10%.

[0041] Wherein, the mass percentages of the four particle gradations of the corundum granular material in the granular material are 10%, 20%, 30%, and 40% in sequence.

[0042] The above-mentioned preparation method of silica sol combined with wet spraying material comprises the following steps:

[004...

Embodiment 2

[0048] A silica sol combined wet spraying material, which is composed of main raw materials and external components; the main raw materials and their mass percentages are: corundum granules 52%, bauxite powder 40%, alumina micropowder (≤2μm 4%, ≤5μm 4% )8%. The mass percentages of additional components and the total mass of the above-mentioned main raw materials are: retarder (carboxymethyl cellulose) 0.8%, dispersant (polyethylene glycol polycondensate 0.8%, sodium hexametaphosphate 0.5%) 1.3 %, coagulant (aluminum phosphate saturated solution) 0.8%, silica sol 12%.

[0049] Wherein, the mass percentages of the four particle gradations of the corundum pellets in the pellets are 16%, 30%, 30%, and 24% in sequence.

[0050] Preparation process: with embodiment 1.

[0051] Construction method: with embodiment 1.

Embodiment 3

[0053] A silica sol combined wet spraying material, which is composed of main raw materials and external components; the main raw materials and their mass percentages are: 30% of corundum granules, 30% of mullite granules, 15% of corundum powder, 15% of alumina powder, Alumina fine powder (≤2μm 2%, ≤5μm 8%) 10%. The mass percentages of the additional components and the total mass of the above-mentioned main raw materials are: retarder (dextrin) 0.6%, dispersant (sodium hexametaphosphate) 1.0%, coagulant (aluminum phosphate saturated solution) 0.6%, silicon Sol 11%.

[0054] Wherein, the mass percentages of the four particle gradations of the corundum pellets in the corundum pellets are 10%, 25%, 30%, and 35% in sequence. The mass percentages of the four particle gradations of the mullite granular material in the mullite granular material are 10%, 25%, 30%, and 35% in sequence.

[0055] Preparation process: with embodiment 1.

[0056] Construction method: with embodiment 1. ...

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Abstract

The invention belongs to the technical field of unshaped refractories, and particularly relates to a silica sol combined wet-type spraying material. The silica sol combined wet-type spraying material is characterized by comprising main raw materials and additional components; the main raw materials include, by weight, 50%-70% of granular materials, 25-40% of powdery materials and 5-10% of alumina micro powder, and the sum of the mass percentages of the main raw materials is 100%; the additional components include retarder, dispersant, coagulant and silica sol which account for 0.4-1.0%, 0.6-1.5%, 0.5-1.2% and 10-14% of the main raw materials respectively. The spraying material has the advantages of high stickiness, low rebound rate, large formwork-free continuous construction thickness, quickness in baking, high medium-temperature strength, wear resistance, high thermal shock resistance and excellent construction performance, and is applicable to quick repairing of linings of blast-furnace shaft areas.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials. In particular, it relates to a silica sol combined with a wet injection material, which is used for rapid repair of the inner lining of the blast furnace body area. Background technique [0002] The shaft area of ​​the blast furnace is the reaction area of ​​iron-making materials. The temperature fluctuation range of this area is 400℃~1200℃, and the furnace lining is damaged in various forms. Including the abrasion of material falling, the scour of hot air flow, the erosion of harmful elements produced by material reaction, etc. The upper temperature of the furnace body is 400 ℃ ~ 800 ℃, which mainly bears the impact and collision of the furnace material, the erosion of furnace dust and rising air flow, the erosion of alkali metals, carbon deposition and damage by temperature stress. High alumina bricks, corundum-mullite bricks, etc. are mostly used in this part. The lowe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 谢大勇彭云涛方昌荣彭艳程水明项冰刘会永熊继全丛培源代洁
Owner 中冶武汉冶金建筑研究院有限公司
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