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|Title:||Tilted lifters for autogenous mills|
|Abstract:||In autogenous mills, lifters used on shell and end linings are so constructed with their teeth tilted toward the direction of rotation of the mill in such a way that teeth of lifters statistically coincide to the mean velocity of falling rocks relative to moving lifters.|
|Inventor(s):||Wei; Yun-Song (Pensacola, FL)|
1. In an autogenous mill including a casing and a number of lifters on both shell and liners within the casing, the improvement comprising said lifters having teeth which are inclined
toward the direction of motion of the mill, said teeth having a center line which will substantially coincide with a mean locus of falling rocks within the mill, said mean locus being substantially a logarithmic spiral, said center line being straight
for better resistance to buckling.
2. An improvement according to claim 1, in which said lifters are fixed at an angle of 20.degree.-45.degree. as determined by optimum working conditions, the mill operating at a speed of 60% to 80% of its critical speed.
3. An improvement according to claim 2 in which the optimum working situation is the best efficiency of the mill.
4. An improvement according to claim 2 in which the optimum working situation is the best quality of the final product.
5. An improvement according to claim 2 in which the optimum working situation is the lowest value of kilowatt hours per ton of the material.
6. An improvement according to claim 2 in which the optimum situation is the even wear pattern of the lifters.
7. An improvement according to claim 2 in which said lifter angle and said operating speed are determined by optimum working conditions.
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