68% 80% 92% 30mm 40mm 50mm 60mm Al2O3 Alumina ball Ceramic Grinding Balls for Ball Mill
Model Number: Hongtai
Minimum Order Quantity: 5 ton
Physical properties of of alumina ball
Moreover, it is required that the dissolution rate of alumina in the cryolite melt is fast, the bottom of the electrolytic cell tank is deep and deep; the heat insulation of the shell on the electrolyte is good; the moisture is not absorbed in the air, the flying loss is small, the fluidity is good, and the transportation is convenient. And to facilitate the automatic feeding of the electrolytic cell. All of these properties depend on the physical properties of the alumina.
The indicators used to characterize the physical properties of alumina are: angle of repose, α-Al203 content, bulk density, particle size and specific surface area, and wear coefficient.
Technical datas of alumina ball
Use and properties of alumina ball
1. The angle of repose. The alumina angle of repose refers to the inclination of the material naturally accumulating on a smooth plane. The alumina with a larger repose angle is more soluble in the electrolyte, and can be well covered on the electrolyte crust during the electrolysis process, and the flying loss is also small.
2. A-Al2O3 content. The content of a-Al2O3 in alumina reflects the degree of alumina roasting. The higher the degree of calcination, the more a-Al2O3 content, the hygroscopicity of alumina decreases with the increase of a-Al2O3 content. Therefore, alumina for electrolysis is required to contain a certain amount of a-Al2O3. However, the solubility of a-Al2O3 in the electrolyte is inferior to that of Υ-Al203.
3, the weight. The bulk density of alumina refers to the weight of a unit volume of material in a natural state. Aluminium, which generally has a small bulk density, facilitates dissolution in the electrolyte.
4. Particle size. The particle size of alumina refers to the degree of its thickness. The particle size of alumina must be appropriate, too coarse in the electrolyte to dissolve slowly, or even precipitate; the rules are easy to fly loss.
5. Specific surface area. The specific surface area of alumina refers to the total surface area of the sum of the outer surface area per unit weight of the material and the surface area of the inner pores. It is an important indicator of the level of material activity. Alumina having a large specific surface area has good solubility in an electrolyte and is active, but is hygroscopic.
6, wear coefficient. The so-called wear coefficient is the percentage change of the fractional content in the sample after the alumina is rubbed in a fluidized bed under controlled conditions. The wear coefficient is a physical indicator of the strength of alumina.
According to the physical properties of alumina, alumina can usually be divided into three types: sand, flour and intermediate. These three types of alumina have large differences in physical properties. The sand-like alumina has a small bulk density, a large specific surface area, a slightly smaller angle of repose, and a smaller amount of a-Al2O3, and the coarse particles are more and more uniform, and the strength is higher. Flour-like alumina has a large bulk density, a small specific surface area, contains a large amount of a-Al2O3, more fine particles, and poor strength. The physical properties of the intermediate alumina are somewhere in between.
Production capacity: Our factory actively response to government environmental protection policy, we designed and built the fully automatic controlled high temperature gas tunnel kiln (1700℃), and got capacity of annual output 70,000 tons of high quality refractory products.
★Bricks: Fumigated wooden pallet with log paperboard covered and stainless steel band strapping, the whole outside is wrapped with thermoplastic film. Or carton packaging.
★Wooden pallet size: usually 92*92cm (standard brick)
★Castable: Ton bag with rain film and 25kg bags inside
★Or according to customer’s requirements
★Port of dispatch: Tianjin port; Qingdao port
★Delivery time: According to customer’s demand or two sides negotiate
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