1. GOVERNMENT ENGINEERING COLLEGE BHARUCH (014)

2. PRESENTED BY NAME- MARVANIYA CHIRAG (130140105017)
BHANUSHALI JEET ( )

3. TOPIC
OPEN-CIRCUIT GRINDING
CLOSED-CIRCUIT GRINDING

4. OPEN-CIRCUIT OPERATION
In many machine, the feed material is reduced to satisfactory size by passing it once through the machine.
If the material is passed only once through the machine and no attempt is made to return the oversize material to it for further reduction, the process is known as open-circuit grinding.

5. Open circuit grinding consists of one or more grinding mills arranged in series or parallel without classfication equipment.
this method discharge a final ground as it comes from a mill and there is no return of coarse discharge back to the mill.

6. EXAMPLES Feed ball mill Product Feed rod mill Product
Combination of ball mill and rod mill.
Feed rod mill ball mill
product

7. IMPORTANCE Some condition that favour open circuit grinding are:
1-small reduction ratio
2-coarse reduction of particle
Advantages of open-circuit grinding are:
1-simplicity of operation
2-minimum equipment requirements.

8. CLOSED-CIRCUIT OPERATION
If the partially ground material from the machine is sent to a size separation unit, from where the undersize is withdrawn as the product and the oversize material is returned to the machine for reground, the process is known as closed circuit grinding.
Closed-circuit grinding though useful for any crusher ,it is commonly employed to machine yielding a fine product.

9. Closed circuit grinding consist of one or more grinding mills with classfication equipment. The mills discharge ground product to classfier which return the coarse product from it to the mill for further grinding .

10. ADVANTAGES Higher capacity.
Lower power consumption per tone of product.
Suitable for reduction to fine and altrafine sizes.
Avoids coarse material in the final ground product by returning it to the mill.
Eliminate overgrinding by removing fines early .

11. FLOW SHEET

12. Thank You