technical NOTES

S. N. Specifications UOM Circular Linear

Stockpile Width Mtr 41.6 32

Effective Stock Pile Length Mtr 146.4 116

Stock Pile Height Mtr 15.4 12.5

Angle of Repose deg. 36 36

No. of stock piles Nos. 1 2

Limestone Bulk Density T/M3 1.36 1.36

and the direction of the inflow and outflow conveyor is variable over 360.
ƒ The stockpile is endless so that the reclaimer is never repositioned.
ƒ In circular stockpile, there is High “live storage volume” of approx. 75%
compared to 50% of a two pile linear system.
ƒ There is a flexibility of converting the stacking pattern from standard
circular piling to linear piling system by changing the program.

• Disadvantages
  ƒ Tunnel is required for reclaiming material.
  ƒ Sticky and very moist material may choke the chutes in the central column.
  ƒ The poke holes for removing the chute jam are relatively inaccessible.
  ƒ Water in the tunnel may cause difficulties in the material extraction.
  ƒ A great disadvantage of a circular stockpile system is that a future extension
  will not be possible. Capacity can be increased only by setting up a
  second pile.
  ƒ Maintenance is difficult as compare to Linear stockpile.

3.1.3 Preferred suppliers

• India
  ƒ Man Takraf
  ƒ Elecon Engineering
  ƒ Metso Minerals
  ƒ TKIL


• Outside India
  ƒ Shenyang mining- China
  ƒ Dalian SDA – China

3.2 Cost Comparison
Based on the below mentioned figures, it is clear that installed capital expenditure
for the circular stacker reclaimer system is less as compared to linear stacker
reclaimer system.

However, the running cost of the linear stockpile is comparatively lower than the
circular stockpile system in spite of long belt conveyors both having same live stock
pile capacities. The reason being that in circular stockpile the total lift of reclaimer
belt is approx.12 mtr. and in case of linear reclaimer belt conveyor the lift is approx .4.5 mtr.