How to use alumina ceramic grinding balls?
Jan 20, 2021
First, how to choose the size, filling amount and ratio of alumina ceramic grinding balls?
Alumina ceramic grinding balls have the characteristics of high strength, high hardness, high wear resistance, high specific gravity, small size, high temperature resistance, corrosion resistance, iron-free, non-polluting, etc., and are widely used in ceramics, glazes, glass, etc. The grinding of non-metals is the grinding medium of ball mills, pot mills, vibration mills, etc. Its performance is significantly higher than that of pebbles.
Alumina ceramic balls are used for grinding in the ball mill. When selecting the product, the type of grinding ball should be considered according to the incompatibility of the material and the Mohs hardness of the product. The hardness of the high alumina ceramic ball is 9, and the density is 3.6. g/cm3, in the wet grinding process, when the filling volume of the balls reaches 55% of the net volume of the ball mill, the better state can be achieved. The weight of the balls in the ball mill can be estimated with an empirical formula, and the filling ratio formula of the balls: ball Stone loading amount=3.14X the square radius of the ball mill radius X the specific gravity of the ball stone X the length of the ball mill X25%*1000.
Regarding the gradation of the alumina ceramic granding ball of the ball mill: Due to the different grinding aids added to the ball mill, the above formula has also changed. Generally speaking, the initial ball stone gradation of the ball mill is: 30% for large balls, 40% for medium balls, and 30% for small balls. In practice, it mainly depends on the particle size of the material to be abrasive. The diameter and speed of the ball mill should also be properly considered. Wet ball mill The crushing of materials mainly relies on grinding instead of impact, so the amount of large balls should be appropriately reduced, and medium and small balls should be used to ensure a good grinding effect. The load of the ball depends on the model of the ball mill, so the above rules are not suitable for the dry crushing process.
Second, what matters should be paid attention to when high-aluminum grinding ball is installed and stopped?
The linings of each silo of the ball mill are basically made of metal. When loading the balls in the air mill, you should first load a certain amount of material (or bulk cement) for buffering, and then install the ceramic balls to avoid a height difference of more than 3m. Cause the ceramic ball to hit the steel liner, cause microcrack damage, and increase the damage rate of the ceramic ball during the production process. In addition, during the cement production process, if the grinding is stopped due to reasons such as production and overhaul, it is necessary to avoid long-term empty grinding operation without material to avoid damage to the alumina ceramic grinding balls
, shorten the ball filling cycle and extend the service life.
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