Main Technical Indicators of High Alumina Refractory Ball
The technical Indicators of high-alumina refractory ball is the main reference basis in the procurement process, which determines the quality of the refractory ball. There are 7 main technical indicators of high alumina refractory ball, which are Al2O3 content, Fe2O3 content, bulk density, apparent porosity, room temperature compressive strength, load softening temperature, and thermal shock stability. The following is the detailed technical indicators of high alumina refractory ball.
1. Al2O3 Content
The popular point of Al2O3 content is the content of aluminum oxide in the raw materials of refractory balls. The aluminum content determines the level of other properties. Therefore, it is the main performance index of refractory balls.
There are four main types of high alumina refractory balls based on aluminum content:
Special grade high-aluminum ball, RQA-80 with 80% aluminum content;
Grade I high aluminum ball, RQA-75 with 75% aluminum content;
Grade 2 high aluminum ball, RQA-65 with 65% aluminum content;
Grade 3 high-aluminum ball, RQA-55 with 55% aluminum content.
2. Fe2O3 Content
Fe2O3 content refers to the content of ferric oxide in the material. Unlike the above-mentioned Al2O3 content, the iron content is an impurity component in high alumina balls. The lower the content, the better the product quality. In national standards, there are no clear requirements for third- and second-class high-alumina refractory balls. The first-class high-alumina refractory balls are not more than 1.8%, and the special high-aluminum refractory balls are not more than 1.6%.
3. Bulk Density
Bulk density is the ratio of the dry mass of the refractory ball to its total volume. The unit is g / cm3. Bulk density mainly indicates the compactness of the refractory ball. Generally, the bulk density of a refractory ball is strongly related to its porosity and mineral composition. In a refractory ball, the higher the bulk density, the better the quality of the product.
The bulk density of the four types of refractory balls are:
Special high-aluminum ball ≥2.7;
Class 1 high aluminum ball ≥2.5;
Secondary high aluminum ball ≥2.3;
Three high-aluminum balls ≥ 2.1.
4. Apparent Porosity
Apparent porosity is the ratio of the volume of the open pores of the refractory ball to the total volume. Usually, the slag and harmful gases in the kiln are eroded by the refractory ball itself through the open pores. Therefore, the smaller the apparent porosity of the refractory ball, the better.
The apparent porosity of the four types of refractory balls are:
Special high-aluminum ball ≤22%;
Class 1 high-aluminum ball ≤24%;
Secondary high aluminum ball ≤26%;
Grade 3 high-aluminum ball ≤28%.
5. Pressure Value at Room Temperature
The room temperature withstand voltage value has a great impact on the production, transportation and use performance of the refractory ball, so it needs a higher withstand voltage value. Its unit is expressed in MPa.
The room temperature and pressure resistance values of the four types of refractory balls are:
Special high-aluminum ball ≥36;
Class 1 high aluminum ball ≥32;
Secondary high aluminum ball ≥14;
Three high-aluminum balls ≥13.
6. Load Softening Temperature
The load softening temperature of the refractory ball refers to the temperature at which deformation occurs during use.
The load softening temperatures of the four types of refractory balls are:
Special grade high aluminum ball ≥1530 ℃;
Class 1 high aluminum ball ≥1480 ℃;
Secondary high aluminum ball ≥1450 ℃;
Three high-aluminum balls ≥1400 ℃.
7. Thermal Shock Stability
Thermal shock stability is the ability of a refractory ball to resist rapid and rapid temperature changes. This performance index for the determination of refractory balls is usually expressed in times under water-cooled conditions at 1100 ° C.
The thermal shock stability of the four types of refractory balls are:
Special high-aluminum ball ≥10 times;
Level 1 high aluminum ball, level 2 high aluminum ball, level 3 high aluminum ball ≥ 15 times.
The above is the requirement of the technical performance index of the refractory ball. When purchasing and using refractory balls, they must be selected in strict accordance with the actual furnace conditions of the hot blast stove, in order to extend the service life of the hot blast stove and save maintenance costs on the premise of ensuring the service life of the refractory balls. The Rongsheng High alumina refractory manufacturer https://highaluminarefractory.com/ is a reliable guarantee for your high alumina refractory ball for hot blast stove. If you need to buy high aluminum refractory balls, please contact us by email: sales@highaluminarefractory.com . Look forward to working with you.
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| High Alumina Refractory Ball |
1. Al2O3 Content
The popular point of Al2O3 content is the content of aluminum oxide in the raw materials of refractory balls. The aluminum content determines the level of other properties. Therefore, it is the main performance index of refractory balls.
There are four main types of high alumina refractory balls based on aluminum content:
Special grade high-aluminum ball, RQA-80 with 80% aluminum content;
Grade I high aluminum ball, RQA-75 with 75% aluminum content;
Grade 2 high aluminum ball, RQA-65 with 65% aluminum content;
Grade 3 high-aluminum ball, RQA-55 with 55% aluminum content.
2. Fe2O3 Content
Fe2O3 content refers to the content of ferric oxide in the material. Unlike the above-mentioned Al2O3 content, the iron content is an impurity component in high alumina balls. The lower the content, the better the product quality. In national standards, there are no clear requirements for third- and second-class high-alumina refractory balls. The first-class high-alumina refractory balls are not more than 1.8%, and the special high-aluminum refractory balls are not more than 1.6%.
3. Bulk Density
Bulk density is the ratio of the dry mass of the refractory ball to its total volume. The unit is g / cm3. Bulk density mainly indicates the compactness of the refractory ball. Generally, the bulk density of a refractory ball is strongly related to its porosity and mineral composition. In a refractory ball, the higher the bulk density, the better the quality of the product.
The bulk density of the four types of refractory balls are:
Special high-aluminum ball ≥2.7;
Class 1 high aluminum ball ≥2.5;
Secondary high aluminum ball ≥2.3;
Three high-aluminum balls ≥ 2.1.
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| High Alumina Refractory Ball Package |
4. Apparent Porosity
Apparent porosity is the ratio of the volume of the open pores of the refractory ball to the total volume. Usually, the slag and harmful gases in the kiln are eroded by the refractory ball itself through the open pores. Therefore, the smaller the apparent porosity of the refractory ball, the better.
The apparent porosity of the four types of refractory balls are:
Special high-aluminum ball ≤22%;
Class 1 high-aluminum ball ≤24%;
Secondary high aluminum ball ≤26%;
Grade 3 high-aluminum ball ≤28%.
5. Pressure Value at Room Temperature
The room temperature withstand voltage value has a great impact on the production, transportation and use performance of the refractory ball, so it needs a higher withstand voltage value. Its unit is expressed in MPa.
The room temperature and pressure resistance values of the four types of refractory balls are:
Special high-aluminum ball ≥36;
Class 1 high aluminum ball ≥32;
Secondary high aluminum ball ≥14;
Three high-aluminum balls ≥13.
6. Load Softening Temperature
The load softening temperature of the refractory ball refers to the temperature at which deformation occurs during use.
The load softening temperatures of the four types of refractory balls are:
Special grade high aluminum ball ≥1530 ℃;
Class 1 high aluminum ball ≥1480 ℃;
Secondary high aluminum ball ≥1450 ℃;
Three high-aluminum balls ≥1400 ℃.
7. Thermal Shock Stability
Thermal shock stability is the ability of a refractory ball to resist rapid and rapid temperature changes. This performance index for the determination of refractory balls is usually expressed in times under water-cooled conditions at 1100 ° C.
The thermal shock stability of the four types of refractory balls are:
Special high-aluminum ball ≥10 times;
Level 1 high aluminum ball, level 2 high aluminum ball, level 3 high aluminum ball ≥ 15 times.
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| RS High Alumina Refractory Ball Manufacturer |
The above is the requirement of the technical performance index of the refractory ball. When purchasing and using refractory balls, they must be selected in strict accordance with the actual furnace conditions of the hot blast stove, in order to extend the service life of the hot blast stove and save maintenance costs on the premise of ensuring the service life of the refractory balls. The Rongsheng High alumina refractory manufacturer https://highaluminarefractory.com/ is a reliable guarantee for your high alumina refractory ball for hot blast stove. If you need to buy high aluminum refractory balls, please contact us by email: sales@highaluminarefractory.com . Look forward to working with you.
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