阅读说明：本技术 一种抗氧化高抗折炉缸浇注料及其生产方法 (Anti-oxidation high-fracture-resistance hearth castable and production method thereof ) 是由 王相丰 裘伟 王维 于 2020-07-30 设计创作，主要内容包括：本发明公开了一种抗氧化高抗折炉缸浇注料及其生产方法,属于耐火材料技术领域。所述浇注料包括白刚玉颗粒、电熔镁砂、铝酸钙水泥、三氧化二铝、二氧化硅微粉、抗氧化剂、稳定剂等原料；其生产方法如下：(1)称取并混合,得到物料一；(3)将物料一、铝酸钙水泥、三氧化二铝、二氧化硅微粉混合,得到物料二；(4)将物料二加水搅拌,安装模具,接着浇注,晾干成型；(5)拆卸模具,得到成型的浇注料,并置于干燥处自然养护；(6)将自然养护后的浇注料进行烘烤处理。与现有技术相比,本发明生产的浇注料具有良好的性能优势,体积密度、线变化率、抗折强度及抗压强度等试验参数均体现了显著性差异,为优质的抗氧化高抗折炉缸浇注料。(The invention discloses an antioxidant high-fracture-resistance hearth castable and a production method thereof, belonging to the technical field of refractory materials. The castable comprises raw materials such as white corundum particles, fused magnesia, calcium aluminate cement, aluminum oxide, silica micropowder, an antioxidant, a stabilizer and the like; the production method comprises the following steps: (1) weighing and mixing to obtain a first material; (3) mixing the first material, calcium aluminate cement, aluminum oxide and silicon dioxide micropowder to obtain a second material; (4) adding water into the material II, stirring, installing a mold, then pouring, airing and forming; (5) disassembling the mold to obtain a molded castable, and placing the castable in a dry place for natural curing; (6) and baking the naturally cured castable. Compared with the prior art, the castable produced by the invention has good performance advantages, and the test parameters such as volume density, linear change rate, rupture strength and compressive strength show significant differences, and is a high-quality antioxidant high-rupture-resistant hearth castable.)

1. The anti-oxidation high-fracture-resistance hearth castable is characterized by comprising the following raw materials in parts by weight:

2. the anti-oxidation high-breaking-resistance hearth castable according to claim 1, characterized by comprising the following raw materials in parts by weight:

3. the anti-oxidation high-breaking-resistance hearth castable according to claim 2, characterized by comprising the following raw materials in parts by weight:

4. the castable for refractory hearth according to claim 1,

the granularity of the white corundum particles is 2mm-3 mm;

the granularity of the fused magnesia is 4mm-8 mm;

the granularity of the calcium aluminate cement is 5mm-10 mm;

the granularity of the aluminum oxide is 200 meshes;

the granularity of the silicon dioxide micro powder is 200 meshes.

5. The castable for refractory hearth according to claim 1,

the antioxidant comprises silicon nitride powder, boron carbide powder and aluminum powder, wherein the weight ratio of the silicon nitride powder to the boron carbide powder to the aluminum powder is 1: 2: 1.5;

the stabilizer comprises triethanolamine, hexamethylenetetramine and carbamide, wherein the weight ratio of the triethanolamine to the hexamethylenetetramine to the carbamide is 2: 3: 5.

6. a production method of an anti-oxidation high-breaking-resistance hearth castable is characterized by comprising the following steps:

(1) weighing white corundum particles, fused magnesia, calcium aluminate cement, aluminum oxide, silica micropowder, an antioxidant and a stabilizer for later use;

(2) sending the white corundum particles, the fused magnesia, the antioxidant and the stabilizer to a ball mill for mixing to obtain a first material for later use;

(3) feeding the first material, the calcium aluminate cement, the aluminum oxide and the silicon dioxide micropowder to a ball mill for mixing to obtain a second material for later use;

(4) adding water into the material II, stirring, mounting a mold on the inner wall of the hearth, pouring the mold into a gap between the mold and the inner wall of the hearth, and airing and forming for later use;

(5) disassembling the mold to obtain a molded castable, and placing the castable in a dry place for natural curing for 72h for later use;

(6) and (5) baking the naturally cured castable to obtain the castable.

7. The method for producing the castable for the anti-oxidation and high fracture resistance hearth according to claim 6, wherein,

the equipment weighed in the step (1) is a material tank scale, a hopper scale, a barrel trough scale or a storage scale.

8. The method for producing the castable for the anti-oxidation and high fracture resistance hearth according to claim 6, wherein,

the rotating speed of the ball mill in the step (2) is 80r/min, and the mixing time is 2-4 h.

9. The method for producing the castable for the anti-oxidation and high fracture resistance hearth according to claim 6, wherein,

the rotating speed of the ball mill in the step (3) is 100r/min, and the mixing time is 6 h.

10. The method for producing the castable for the anti-oxidation and high fracture resistance hearth according to claim 6, wherein,

the adding amount of the water in the step (4) is 10 percent of the total weight of the material II;

the baking temperature in the step (6) is 550 ℃, and the baking time is 50 h.

Technical Field

The invention belongs to the technical field of refractory materials, and particularly relates to an antioxidant high-fracture-resistance hearth castable and a production method thereof.

Background

The blast furnace hearth is main equipment for continuously performing high-temperature operation, is an important guarantee for high efficiency and low consumption of related enterprises, and is a key part for safety and long service life in the production process of the blast furnace. The furnace hearth is subjected to physical rotational flow, eddy current scouring and chemical erosion of molten iron for a long time, so that melting loss and damage to the furnace hearth are caused. Therefore, effective measures are taken to improve the structure and the material of the hearth, and the method has important significance for prolonging the service life of the blast furnace.

The improvement of the service life and the safety performance of the blast furnace are always the research hotspots of the technical personnel in the field. Practice shows that the sol combined castable can replace a ceramic cup and a tuyere combined brick in a blast furnace hearth, can prolong the service life of the hearth and improve the safety factor. Therefore, the castable for the ceramic cup of the hearth in the prior art mostly adopts the pumping castable combining silica sol and corundum silicon carbide, is optimized and improved on the basis of the material of the traditional ceramic cup (plastic corundum brick, corundum mullite brick and the like), has good overall performance, can be tightly and effectively attached to the interface of a carbon brick, and resists the corrosion of slag and iron. However, the existing corundum silicon carbide castable has weak oxidation resistance, cannot effectively improve the pressure resistance and the fracture resistance, cannot fundamentally improve the service life of a blast furnace, and cannot fundamentally ensure the safe and long-life operation of a hearth.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems in the prior art, the invention provides the anti-oxidation high-breaking-resistance hearth castable and the production method thereof.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the invention is as follows:

an antioxidant high-fracture-resistance hearth castable comprises the following raw materials in parts by weight:

the anti-oxidation high-fracture-resistance hearth castable comprises the following raw materials in parts by weight:

the anti-oxidation high-fracture-resistance hearth castable comprises the following raw materials in parts by weight:

in the anti-oxidation high-bending-resistance hearth castable, the particle size of the white corundum particles is 2-3 mm; the granularity of the fused magnesia is 4mm-8 mm; the granularity of the calcium aluminate cement is 5mm-10 mm; the granularity of the aluminum oxide is 200 meshes; the granularity of the silicon dioxide micro powder is 200 meshes.

In the above refractory castable for high oxidation resistance and high bending resistance hearth, the antioxidant comprises silicon nitride powder, boron carbide powder and aluminum powder, and the weight ratio of the silicon nitride powder to the boron carbide powder to the aluminum powder is 1: 2: 1.5;

the stabilizer comprises triethanolamine, hexamethylenetetramine and carbamide, wherein the weight ratio of the triethanolamine to the hexamethylenetetramine to the carbamide is 2: 3: 5.

a production method of an anti-oxidation high-breaking-resistance hearth castable comprises the following steps:

(1) weighing white corundum particles, fused magnesia, calcium aluminate cement, aluminum oxide, silica micropowder, an antioxidant and a stabilizer for later use;

(2) sending the white corundum particles, the fused magnesia, the antioxidant and the stabilizer to a ball mill for mixing to obtain a first material for later use;

(3) feeding the first material, the calcium aluminate cement, the aluminum oxide and the silicon dioxide micropowder to a ball mill for mixing to obtain a second material for later use;

(4) adding water into the material II, stirring, mounting a mold on the inner wall of the hearth, pouring the mold into a gap between the mold and the inner wall of the hearth, and airing and forming for later use;

(5) disassembling the mold to obtain a molded castable, and placing the castable in a dry place for natural curing for 72h for later use;

(6) and (5) baking the naturally cured castable to obtain the castable.

In the production method of the anti-oxidation high-bending-resistance hearth castable, the equipment weighed in the step (1) is a charging basket scale, a hopper scale, a bucket trough scale or a storage scale.

In the production method of the anti-oxidation high-fracture-resistance hearth castable, the rotating speed of the ball mill in the step (2) is 80r/min, and the mixing time is 2-4 h.

In the production method of the anti-oxidation high-fracture-resistance furnace hearth castable, the rotating speed of the ball mill in the step (3) is 100r/min, and the mixing time is 6 hours.

In the production method of the anti-oxidation high-fracture-resistance hearth castable, the adding amount of water in the step (4) is 10% of the total weight of the material II; the baking temperature in the step (6) is 550 ℃, and the baking time is 50 h.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

compared with the prior art, the castable produced by the invention has good performance advantages, and the test parameters such as volume density, linear change rate, rupture strength and compressive strength show significant differences, and is a high-quality antioxidant high-rupture-resistant hearth castable. On the basis of the existing castable formula, substances such as white corundum particles, fused magnesia, antioxidants and the like are innovatively introduced, and the substances can generate a synergistic effect, so that the structure of the castable is changed, the volume density of the castable is improved, and parameters such as compression resistance, bending resistance and the like are well improved; meanwhile, the process method improves the constructability of the castable and can improve the linear change rate of the castable.

Detailed Description

The invention is further described with reference to specific examples.