Ball milling is generally divided into dry milling and wet milling, wet milling is the most commonly used method with the advantage of high efficiency, and uniform particles out of milling. Because large particles in the ball milling with media grinding and impact action, there will be cracks. The cracks will break to form small particles over time, that is, the so-called grinding process. If it is dry grinding, then the particles in the ball milling process crack expansion, due to the ball milling ball or between the particles of the extrusion, the formation of cracks may be squeezed “closed”, the cracks can not be effectively expanded, the large particles can not be quickly fracture the formation of small particles. But if it is wet grinding, then the liquid ball milling medium (water or anhydrous ethanol, etc.) will enter the crack gap formed, blocking the crack closure, which will effectively make the crack expand rapidly, and will greatly improve the ball milling efficiency. Dry grinding is generally used for the material in the liquid medium does not react. If there is a reaction, it will form other substances in the ball mill, then the ball mill is meaningless, such as: cement can not be ball milled in water. At the same time, due to the design of the ball mill tank, it will form some dead ends where the materials couldn’t be milled in dry grinding. But wet grinding also has a weakness, that is, after wet grinding, we need powder to dry to remove moisture or other liquid media, so it will increase the consumption and cost. But currently wet grinding is widely used in industrial production
Wet grinding ratio is ball: material: water (or other liquids) = 4:2:1 relationship, or within this range to do a small adjustment. The specific can be determined through experiments and the size of the alumina grinding ball graded requirements. With the good ratio, the efficiency of ball milling will be greatly improved . If you are not sure about the ratio, we can do experiment for you in our laboratory.