The image above represents the mill speed. Two essential parameters are needed to calculate mill speed: speed percentage (N%) and critical speed (Nc).
The formula for calculating mill speed:
MS = N% x Nc
Where:
MS = Mill Speed
N% = Speed Percentage
Nc = Critical Speed
Let’s solve an example;
Find the mill speed when the speed percentage is 12 and the critical speed is 10.
This implies that;
N% = Speed Percentage = 12
Nc = Critical Speed = 10
MS = N% x Nc
Then, MS = (12/100) x (10)
MS = (0.12) x (10)
MS = 1.2
Therefore, the mill speed is 1.2 m/s.
Calculating the Speed Percentage when the Mill Speed and the Critical Speed are Given
N% = MS / Nc
Where;
N% = Speed Percentage
MS = Mill Speed
Nc = Critical Speed
Let’s solve an example;
Find the speed percentage when the mill speed is 24 and the critical speed is 6.
This implies that;
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MS = Mill Speed = 24
Nc = Critical Speed = 6
N% = MS / Nc
So, N% = 24 / 6
N% = 3
Therefore. the speed percentage is 3 m/s.
Read more:Â How to Calculate and Solve for Critical Mill of Speed | Ball Mill Sizing
Calculating the Critical Speed when the Mill Speed and the Speed Percentage are Given
Nc = MS / N%
Where;
Nc = Critical Speed
MS = Mill Speed
N% = Speed Percentage
Let’s solve an example;
Find the critical speed when the mill speed is 30 and the speed percentage is 3.
This implies that;
MS = Mill Speed = 30
N% = Speed Percentage = 3
Nc = MS / N%
That is, Nc = 30 / 3
Nc = 10
Therefore, the critical speed is 10 m/s.
Read more:Â How to Calculate and Solve for Shaft Power | Ball Mill Sizing
How to Calculate Mill Speed With Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the mill speed.
To get the answer and workings of the mill speed using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
To get access to the professional version via web, you need to register and subscribe for NGN 2,000 per annum to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator
Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.
Now, Click on Ball Mill Sizing under Materials and Metallurgical
Now, Click on Mill Speed under Ball Mill Sizing
The screenshot below displays the page or activity to enter your values, to get the answer for the mill speed according to the respective parameters which is the Speed Percentage (N%) and Critical Speed (Nc).
Now, enter the value appropriately and accordingly for the parameter as required by the Speed Percentage (N%) is 12 and Critical Speed (Nc) is 10.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the mill speed and presents the formula, workings and steps too.
