Re: Washing Screen. Correct Water Amount?
Originally Posted by Stevenson1982
Hi, I am trying to see if anyone can help me with an enquiry below?
I am trying to see if there are any rules of thumb or calculations that can be used to work out how much water I need to wash/rinse the material adequately for the application below?
"Customers intention to install a new rinsing screen in order to final wash 20mm and 10mm single sized aggregates prior to load out in order to wash out any deleterious material and accumulated fines that may be present.
The 4/10mm and 10/20mm limestone which will be supplied as single sizes to six separate on site concrete plants.
Due to the very high technical specification of the project, the 10mm single size that is produced does not meet the required material specification. The specification requires an average of 1%, and a maximum of 1.5% passing 0.063mm. Also, 10% of the current 20mm production does not meet the required material specification.
Extensive field trials have demonstrated that the handling and re-handling of the material between the point of production and delivery to the concrete plants will result in an increase in the 0.063mm content in excess of 1%. Therefore, in order to meet the delivered specification as above, the material will need to be produced with less than 0.5% passing 0.063mm.
The screen should be suitably sized by the manufacturer based on the following application details:-
The screen should be designed to accept either single sized 20mm or 10mm limestone material with a minimal amount of degraded fines material present caused by the various movements of the material.
The screen should be suitably sized for a feed of 150 tonnes per hour although the manufacturer should indicate the maximum tonnage that the proposed screen is able to handle.
The amount of fine materials associated with the single sized material is mainly present in the 10mm and there is approximately 3% fines reported in some cases. Based on this there will be approximately 4.5 tonnes per hour of -2mm material present.
Manufacturers should allow for tonnage peaks of up to 200 metric tonnes per hour and advise the maximum allowable for the machine design proposed"
I am trying to see if there are any rules of thumb or calculations that can be used to work out how much water I need to wash/rinse the material adequately for the application below?
"Customers intention to install a new rinsing screen in order to final wash 20mm and 10mm single sized aggregates prior to load out in order to wash out any deleterious material and accumulated fines that may be present.
The 4/10mm and 10/20mm limestone which will be supplied as single sizes to six separate on site concrete plants.
Due to the very high technical specification of the project, the 10mm single size that is produced does not meet the required material specification. The specification requires an average of 1%, and a maximum of 1.5% passing 0.063mm. Also, 10% of the current 20mm production does not meet the required material specification.
Extensive field trials have demonstrated that the handling and re-handling of the material between the point of production and delivery to the concrete plants will result in an increase in the 0.063mm content in excess of 1%. Therefore, in order to meet the delivered specification as above, the material will need to be produced with less than 0.5% passing 0.063mm.
The screen should be suitably sized by the manufacturer based on the following application details:-
The screen should be designed to accept either single sized 20mm or 10mm limestone material with a minimal amount of degraded fines material present caused by the various movements of the material.
The screen should be suitably sized for a feed of 150 tonnes per hour although the manufacturer should indicate the maximum tonnage that the proposed screen is able to handle.
The amount of fine materials associated with the single sized material is mainly present in the 10mm and there is approximately 3% fines reported in some cases. Based on this there will be approximately 4.5 tonnes per hour of -2mm material present.
Manufacturers should allow for tonnage peaks of up to 200 metric tonnes per hour and advise the maximum allowable for the machine design proposed"
For relatively clean material you should think about 0.5 x volume of material = 100m3 would be a good point to start.
Regards
Ziggy Gregory ■
Ziggy Gregory www.vibfem.com.au
Washing Screen. Correct Water amount?
Hi, I am trying to see if anyone can help me with an enquiry below?
I am trying to see if there are any rules of thumb or calculations that can be used to work out how much water I need to wash/rinse the material adequately for the application below?
"Customers intention to install a new rinsing screen in order to final wash 20mm and 10mm single sized aggregates prior to load out in order to wash out any deleterious material and accumulated fines that may be present.
The 4/10mm and 10/20mm limestone which will be supplied as single sizes to six separate on site concrete plants.
Due to the very high technical specification of the project, the 10mm single size that is produced does not meet the required material specification. The specification requires an average of 1%, and a maximum of 1.5% passing 0.063mm. Also, 10% of the current 20mm production does not meet the required material specification.
Extensive field trials have demonstrated that the handling and re-handling of the material between the point of production and delivery to the concrete plants will result in an increase in the 0.063mm content in excess of 1%. Therefore, in order to meet the delivered specification as above, the material will need to be produced with less than 0.5% passing 0.063mm.
The screen should be suitably sized by the manufacturer based on the following application details:-
The screen should be designed to accept either single sized 20mm or 10mm limestone material with a minimal amount of degraded fines material present caused by the various movements of the material.
The screen should be suitably sized for a feed of 150 tonnes per hour although the manufacturer should indicate the maximum tonnage that the proposed screen is able to handle.
The amount of fine materials associated with the single sized material is mainly present in the 10mm and there is approximately 3% fines reported in some cases. Based on this there will be approximately 4.5 tonnes per hour of -2mm material present.
Manufacturers should allow for tonnage peaks of up to 200 metric tonnes per hour and advise the maximum allowable for the machine design proposed" ■