The speed of a Ball Mill is in measured in revolutions per minute (rpm) of its drum.To measure this, you need a stopwatch (preferably that rings!) and a thick felt pen. Mark a bold line lengthwise on the outside of the drum. Then start the loaded ball mill and allow it to reach its steady loaded speed. Then press the stopwatch timed for a minute, and count the number of times the bold line comes into view before the stopwatch rings.
The speed of rotation (rpm) of the loaded ball mill is critical to success:too slow, and the milling takes too long; while too fast, and the contents (balls, ore and water) slam against the wall, inhibiting milling.Now use trial-and-error to discover the critical speed at which the centrifugal force pins the balls against the inside of the drum - they cease to roll and no longer fall. For this, the ball mill should be fitted with a variable speed drive.
The critical speed can also be derived by 42.3/D0.5 where D is the diameter in METRES. For instance, a 90cm diameter ball mill has a critical speed of 44 rpm. For efficient milling, the critical speed is too high - you need now to determine the optimal speed which is about 70-75% of the critical speed. For instance a 90cm diameter ball mill with a critical speed of 44 rpm has an optimal speed of 31 to 33 rpm. Get rotary kiln,ball mill,Mineral Processing From http://www.ballmill8.com
The speed of a Ball Mill is in measured in revolutions per minute (rpm) of its drum.To measure this, you need a stopwatch (preferably that rings!) and a thick felt pen. Mark a bold line lengthwise on the outside of the drum. Then start the loaded ball mill and allow it to reach its steady loaded speed. Then press the stopwatch timed for a minute, and count the number of times the bold line comes into view before the stopwatch rings.
The speed of rotation (rpm) of the loaded ball mill is critical to success:too slow, and the milling takes too long; while too fast, and the contents (balls, ore and water) slam against the wall, inhibiting milling.Now use trial-and-error to discover the critical speed at which the centrifugal force pins the balls against the inside of the drum - they cease to roll and no longer fall. For this, the ball mill should be fitted with a variable speed drive.
The critical speed can also be derived by 42.3/D0.5 where D is the diameter in METRES. For instance, a 90cm diameter ball mill has a critical speed of 44 rpm. For efficient milling, the critical speed is too high - you need now to determine the optimal speed which is about 70-75% of the critical speed. For instance a 90cm diameter ball mill with a critical speed of 44 rpm has an optimal speed of 31 to 33 rpm. Get rotary kiln,ball mill,Mineral Processing From http://www.ballmill8.com
Author Resource:
Shanghai Minggong Heavy Equipment Co.,Ltd(Shanghai Daming factory), is an export & import company,which specialized in large and medium-sized series of mining machinery,metallurgical machinery and building materials equipments,R & D, producton and marketing into a joint-stock enterprises.In 2005,coordinating with city construction,the company buy 40000m2 land in Shanghai Jiading Malu high-tech Park,build factory 18000m2,15000000RMB assets,more than 400 employees, has a scientific research group with 70 technologists and 20 senior engineer.Many years experiences bring up a well-trained riveter and welder team. The company have a long-term cooperation with many research institutions in China and aboard,bring in advanced technology of the world.
![[Valid RSS feed]](http://www.look4articles.com/images/icon_Rss.png "XML Feed For RSS"){kind=icon}
Category Rss Feed
Print This Article
Add To Favorites
![[Valid RSS feed]](http://www.look4articles.com/images/rss.jpg "XML Feed For RSS")