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Ball Mill

Ball mill grinding involves using a cylindrical device containing ball shaped grinding media to reduce ceramic particles to smaller sizes through compression, impact, and shear. Sand samples were ground for one hour in a ball mill with grinding media and sieved to determine size distribution and compare to unground samples. Sieve analysis showed grinding increased finer particles, demonstrating ball mill grinding's ability to comminute materials through mechanical action.

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HeeshanGunathilaka
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350 views3 pages

Ball Mill

Ball mill grinding involves using a cylindrical device containing ball shaped grinding media to reduce ceramic particles to smaller sizes through compression, impact, and shear. Sand samples were ground for one hour in a ball mill with grinding media and sieved to determine size distribution and compare to unground samples. Sieve analysis showed grinding increased finer particles, demonstrating ball mill grinding's ability to comminute materials through mechanical action.

Uploaded by

HeeshanGunathilaka
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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TITLE: Ball mill grinding.

INTRODUCTION: Ball mill grinding is one of mechanical grinding (reduction particles to small sizes) method of ceramics. Basically ball mill is a cylindrical device with ball shaped grinding media which is used to grind the particles. Materials like Ceramic, Flint and Stainless Steel are used as grinding media. To obtain powder with high purity, same material is used In the grinding process particles to be ground are partially filled to the mill with grinding media and during the operation cylinder rotate a horizontal axis. In ball mill grinding comminution occurs by compression, impact and shear between moving grinding media and the particles. There are two main conditions which can be used in the ball mill grinding Wet milling Dry milling The rate of grinding is very important thing in ball mill grinding. It should be controlled to obtain and depend on mill parameters, properties of grinding media and properties of particles to be ground. In this practical our purposes were study the working of ball mill and principles of sieve analysis method, also observing how to change the cumulative retained particle weight with the mesh size by plotting a graph percentage cumulative retained vs. mesh size.

MATERIALS AND APPARATES:


Sand Ball mill and pebbles Set of sieves Electronic balance Mechanical sieve shaker

PROCEDURE First of all, two samples of sand of 100g were measured using the balance. Then, one sample is charged into ball mill with the 50% different size of grinding media and the operation is continued for one hour. Simultaneously, other sand sample was put into set of sieves and the size distribution is determined by sieve analysis method. After one hour grinding process ground sample was taken out and the size distribution of this sample was determined by sieve analysis method. Finally, percentage cumulative retained vs. size graph was plotted using the data which obtained by sieve analysis method.

CALCULATION:

For sieve analysis of the first sample (without grindings)

Mesh size (m) 1700 1000 710 500 355 250 150 106 pan

Retained weight (g) 1.17 47.48 36.63 9.37 2.38 4.15 0.08 0.00 0.00

Cumulative weight (g) 1.17 48.65 85.28 94.65 97.03 101.18 101.26 101.26 101.26

Cumulative Retained weight % ( 1.15 48.04 84.21 93.47 95.82 99.92 100.00 100.00 100.00 )

For sieve analysis of the second sample (after grindings)

Mesh size (m) 1700 1000 710 500 355 250 150 106 pan

Retained weight (g) 0.00 0.51 5.05 17.09 13.76 13.31 14.07 7.01 16.23

Cumulative weight (g) 0.00 0.51 5.56 22.65 36.41 49.72 63.79 70.80 87.03

Cumulative Retained weight % ( 0.00 0.59 6.39 26.03 41.84 57.12 73.30 81.35 100.00 )

RESULTS:

Before grinding ( Graph No.1)

After grinding ( Graph No.2)

Mesh size 1700 1000 710 500 355 250 150 106 pan

% Cumulative retained 1.15 48.04 84.21 93.47 95.82 99.92 100.00 100.00 100.00

Mesh size 1700 1000 710 500 355 250 150 106 pan

% Cumulative retained 0.00 0.59 6.39 26.03 41.84 57.12 73.30 81.35 100.00

CONCLUSION:
The amount of finer particles can be increased by grinding using the

ball mill with the proper charge and ratio between the pebbles and the materials.

REFERANCE:

Semester 3 , ceramic science lecture note Ball mill - Wikipedia, the free encyclopedia.htm

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