 |
What is the Effect of the Duration of Time in Ball Mill |
|
Submitted by ballmill
| RSS Feed
| Add Comment
| Bookmark Me!
‘Duration of time’ (understood as residence time) is assumed as Tres = k*L/(N*D*S) (L=length, D=internal diameter, S=slope, N=RPM of the mill, k=constant), even though this may be a simplified rough approximation. The formula with k=0.19 is reported in Perry for Rotary Driers (5th ed, p 20-40, Solids-Drying Equipment), and I verified it for a pilot Rotary Kiln too (more complex formulae consider additional factors and material properties). A mill is also a rotating cylinder, but with balls in it, so k is expected to be different. At any case Tres can be assumed more or less independent of feed rate.
Hold up (understood as held mass fraction) in steady state is feed rate * residence time; thus hold up can be assumed proportional to residence time. Apparently longer residence time will result in thinner granulometry at the exit (all other parameters remaining same), but Tres is assumed to remain constant under supposed conditions as said (constant L, N, D, S). Get Mineral Processing,rotary kiln,ball mill From http://www.ballmill8.com
‘Duration of time’ (understood as residence time) is assumed as Tres = k*L/(N*D*S) (L=length, D=internal diameter, S=slope, N=RPM of the mill, k=constant), even though this may be a simplified rough approximation. The formula with k=0.19 is reported in Perry for Rotary Driers (5th ed, p 20-40, Solids-Drying Equipment), and I verified it for a pilot Rotary Kiln too (more complex formulae consider additional factors and material properties). A mill is also a rotating cylinder, but with balls in it, so k is expected to be different. At any case Tres can be assumed more or less independent of feed rate.
Hold up (understood as held mass fraction) in steady state is feed rate * residence time; thus hold up can be assumed proportional to residence time. Apparently longer residence time will result in thinner granulometry at the exit (all other parameters remaining same), but Tres is assumed to remain constant under supposed conditions as said (constant L, N, D, S). Get Mineral Processing,rotary kiln,ball mill From http://www.ballmill8.com
Click for Details --> http://www.ballmill8.com <--
|
|
|
|
|
LinkedIn Recommendation:
 Harold Ramsey - Php Developer at Euromerica USA - Man... I was lost on my business plan until I met Teo through his eWorkshopCourses.com program. He came up with several completely new revenue models for my business that I totally missed! This guy is a powerhouse too with information distribution on the web... When it comes to tech, his firm is a one stop shop! - March 15, 2012, Harold was Teo's client |
|
Featured [Mineral Processing] Articles:
|
|
