exp 7

INTRODUCTION: Ball mill is the equipment to be used for size reduction. It is a kind of grinder used for intermediate or fine grinding. Ball mill is a metal cylinder which rotates about its horizontal axis. The coarse sugar charged along with the metal balls breaks to fine powder by impact of metal balls. The size reduction is actually to make the too large to be used solid materials usable. It leads to an increase in surface area per unit volume that enhances the rate of the reaction by allowing more sites for the reaction to take place. Moreover handling of smaller size particles is much easier as compared to that of bigger particles. Particle size is one of the significant parameters influencing the grinding kinetic and in selecting of optimum ball size in ball mills. That is why it forces researchers to describe the more accurate relationship between particle size-grinding kinetic and particle size-optimum ball size OBJECTIVE: To study the concept of size reduction using ball mill

DISCUSSION: The objective in this experiment was to learn the concept of size reduction by using ball mill. Based on the graph of percentage of weight particles versus aperture size for coarse sugar, the distribution of particle size was not uniform after ball milling. However, the particle size was reduced after the ball milling. This was showed when the weight retained on receiver after the ball milling was higher than before the ball milling. This because the ball milling was grinding the course sugar to decrease the particle size from bigger size to smaller size. Next, for the average particle size of the sample. It can be measured by using the sieve with a different arrangement of aperture size which is the bigger aperture was on top while the smaller aperture at the bottom. Based on the result obtained, the distribution of the sugar powder increase at the small aperture size than the biggest one because the sugar can through smoothly the big aperture size of the sieve. Lastly, from the graph, the size reduction of coarse sugar after ball milling showed the differences of the distribution at each of the sieve compared to before ball milling. This is because the device are capable of producing very fine powders but are quite energy inefficient. Therefore, the ball milling is the one of the correct device that can be used to reduce the particle size of the sample.

CONCLUSION: In a conclusion, the concept of size reduction using ball mill was successfully achieved. The ball mill usually used to grind the raw materials such as coarse sugar to reduce the particle size of the sample especially in food industry.

REFERENCES: 1. Chanchan Sun, R. L., , Kai Ni, TaoWu a, Xinye Luo, Bin Liang, Min Zhang. (2016). Reduction of particle size based on superfine grinding: Effects on structure, rheological and

gelling

properties

of

whey

protein

concentrate.

69-79.

doi:

10.1016/j.jfoodeng.2016.03.002 2. Shimadzu. (2017). Particle Size Distribution Dependent on Principle of Measurement. (Shimadzu Corporation) 3. http://metalurji.mu.edu.tr/Icerik/metalurji.mu.edu.tr/Sayfa/LAB%20-%20Particle%20size %20reduction,%20screening%20and%20size%20analysis.pdf 4. http://inzynieria-aparatura-chemiczna.pl/pdf/2009/2009-4/InzApChem_2009_4_3437.pdf