DESIGN AND FABRICATION OF MINI BALL MILL.
This project is to design and fabricate the mini ball mill that can grind the solid state of various type of materials into nano-powder. The cylindrical jar is used as a mill that would rotate the material that about to be ground, a motor is used to power the system so that the jar can rotate in high speed and using the regulator controls the speed of the rotation of the jar. The solid material will be put into the stainless steel jar with the metal balls. Gearing system is used to transmit more torque from motor to generate higher rotating speed. The speed of the rotation will be control by the regulator and the jar will keep rotating until the material inside become a very fine powder. To ensure the stability of the mini ball mill, a ball mill base is design and fabricate to withstand the weight of the rotating jar, motor and gears. After a few hours, stop the mini ball mill and the powder can be filtered out by the removing the metal balls. Observation will be taken if the material can be crushed into nano-powder form and how long it takes.
The aim of this project is to design and fabricate ball ,milling machine that is capable of grinding already crushed material ores into fine particles, which will be cost effective, durable and less,cumbersome. Alternative materials were used like mild steel in the material. selection which makes easily affordable for light duty centers. The machine is categorized under the tumbling mill type of milling machine, which the rotation cf the cylinder placed horizontally on the two parallel shafts placed side by side to each other. Due to the slow operational rotation of the machine, a speed reducer mechanism was introduced to further step down the generated speed from the electric motor.
Typically, the mini ball milling device consists of a cylindrical vessel mounted on an appropriate basis at both ends which allows rotation of the vessel around the center axis. The mill is driven by long high density mild steel shaft and powered by an AC motor mounted to the base of the ball mill. A gear pulley system is used in our model whereby one is attached to the motor the main power supply and the other one is attached to the shaft that is rotates the cylindrical vessel. Using the gear ratio, the reduction of the velocity of the motor is take place because a desirable spend is needed to grind the mill. After the mill is charged with the starting material (ore, rock, etc.) and the grinding media (balls), the milling process takes place during rotation as a result of the transfer of kinetic energy of the moving grinding media into the grinding product. The grinding media used is with sizes of the balls ranging from 6 to 14 mm in diameter. As in the speed of rotation of the mill, centrifugation characteristic which means very fast rotation is used to grind micro metal powder into nano powders. Furthermore, the mass, volume, hardness, density and size distribution of the material charged in the mill is considered alongside with the mass, density, ball size distribution of the grinding media balls. The influence of grinding conditions on the production of fine particles and the width of the particle size distribution produced during ball mill grinding. As a result, measurement is taken to check whether nano powder is produce or not
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