Advantages and Physical Properties of Alumina Hollow Sphere

Alumina hollow balls have good temperature resistance, high stability after heating, and a simple structure that can effectively reduce the weight of the furnace body. It can also achieve energy-saving effects during use and reduce losses. The wear percentage of alumina hollow balls is low. , the following introduces the advantages and physical characteristics of alumina hollow spheres.

1. Advantages of alumina hollow spheres

1. High operating temperature: up to 1750 degrees or more, good thermal stability. The change rate of the reburning line is small, and it can be used for a longer period of time.

2. Optimize the structure and reduce the weight of the furnace body: the high-temperature-resistant materials currently used are heavy bricks with a volume density of 2.6-3.0g/cm. The alumina hollow ball brick is only 1.1~1.5g/cm3, the same volume of one cubic meter, the use of alumina hollow ball brick can reduce the weight of 1.1-1.9 tons.

Advantages and physical characteristics of alumina hollow spheres

3. Material saving: to achieve the same operating temperature, if heavy bricks are used, the price is equivalent to that of alumina hollow ball bricks. And also need considerable insulation layer refractory material. If alumina hollow ball bricks are used, 1.1-1.9 tons of heavy bricks can be saved per cubic meter, and 80% of refractory insulation materials can be saved.

4. Energy saving: Alumina hollow balls have obvious thermal insulation properties and low thermal conductivity, which can play a very good thermal insulation effect. Reduce heat dissipation and improve thermal efficiency, thereby achieving the purpose of saving energy. The energy saving effect can reach more than 30%.

2. Physical properties of alumina hollow spheres

1. a-Al2O3 content: the a-Al2O3 content in alumina reflects the degree of calcination of alumina, the higher the degree of calcination, the more a-Al2O3 content. The hygroscopicity of alumina becomes worse with the increase of a-Al2O3 content. Therefore, alumina for electrolysis requires a certain amount of a-Al2O3. However, the solubility of a-Al2O3 in the electrolyte is worse than that of γ-Al203.

2. Bulk density: The bulk density of alumina refers to the weight of the material per unit volume in the natural state. Generally, alumina with a small bulk density is conducive to dissolution in the electrolyte.

3. Particle size: The particle size of alumina refers to its thickness. The particle size of alumina is appropriate, and if it is too coarse, it will dissolve slowly in the electrolyte. even precipitation. If it is too small, it is easy to cause flying loss.

4. Specific surface area: The specific surface area of ​​alumina refers to the total surface area of ​​the sum of the outer surface area of ​​the material per unit weight and the inner surface area. It is an important indicator of the activity of the substance. Alumina with a large specific surface area has good solubility in electrolytes and high activity, but it is easy to absorb moisture.

5. Wear coefficient: The so-called wear coefficient is after alumina is rubbed against a fluidized bed under certain conditions. The percentage change in particle size content in a sample. The wear coefficient is a physical index to characterize the strength of alumina.