Re: 70% Copper Slurry
70% mass is a bit high but only so. 70% vol is also possible, but different. It depends on the total heads involved. Generally speaking its a matter of density ratios & viscosities. You know the former & the latter can be measured like we did in the physics labs at school. Nothing's changed. Falling sphere & stopwatch job.
If you've been involved with the Slurry Systems Handbook, McGraw Hill, I can understand your comments re empirical. At present my copy is purely medicinal; in that it is being used to pack my monitor to a more comfortable height! ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Thanks
HAHAHAHAHAH
Don't worry, I didn't get to buy a copy. I spent my money in a smaller, better and cheaper book: Brown and Heywood Slurry Handling....
Anyway... it is a 70% mass slurry with 0,04 mm particles. Correlations doesn't give me a clear prognosis about the settling or not settling behavior. Is in the border...
That's why i'm not sure how to determine critical velocity. But i'm seriously thinking about meassuring properties in slurry.
Well, thanks again!
Leonardo ■
Copper Concentrate Slurry
Depends on who far you want to pump and at what head.
70% slurry with 70% Copper concetrate by weight and 30 % water by weight will be reasonably fluid. Pumping in plant to next process operation is possible by using a suitable centrifugal pump.
can you give some more details like
1. sp.gr of concentrate.
2. horizontal length and vertical lift for pumping.
3. Amount of slurry to be pumped in m3/hour ■
Hi Vinayak
The data is as follows:
1. sp. gr. slurry 2,18
2. 300 m horizontal length, 20 m vertical
3. 23 m3/h
as you see, is a rather small instalation. The point is that I don't find the critical velocity to design it...
Thanks and regards!
Leonardo ■
Copper Slurry.
The quantity is really too small for a pump and pipeline.
If it is an in plant operation from one process shop to another, you can consider movement by tank lorry with discharge into a trough for pumping into the next process tank. ■
Re: 70% Copper Slurry
No it isn't too small for a pump. Buying 2 tankers, with discharge pumps??? would easily buy a little high quality pump with an adequate casing pressure rating. (then there is no need to cater for truck turning circles at each end of a 300m run...FG'sSake.)
Particle size is right & the concentration OK. Just blast it along with a belt driven pump & juggle the pulley sizes until you're totaly happy. It's what we do. Never overly concern yourself with pipeline replacement costs..there is a job to do.
Very best of luck with the slurry assessment. Do it yourself...labs are a rip-off in so much as their time costs you production delays. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: 70% Copper Slurry
Originally posted by johngateley
No it isn't too small for a pump. Buying 2 tankers, with discharge pumps??? would easily buy a little high quality pump with an adequate casing pressure rating. (then there is no need to cater for truck turning circles at each end of a 300m run...FG'sSake.)
Particle size is right & the concentration OK. Just blast it along with a belt driven pump & juggle the pulley sizes until you're totaly happy. It's what we do. Never overly concern yourself with pipeline replacement costs..there is a job to do.
Very best of luck with the slurry assessment. Do it yourself...labs are a rip-off in so much as their time costs you production delays.
To add to what john has said:
A "Rupp" or "Wilden" double diaphram pump will work as well in your situation the piping distance is not a bother either as you can use victaulic grooved pipe , fittings, gaskets and clamps for the job easly with no fussing and no worries as it can handle the load with no problem since the "Victaulic" system is used world wide for slurries and a small air powered diaphram pump willl pump what ever it can receive in the chambers with little effort on the pumps part. ■
Re: 70% Copper Slurry
I performed experiments using 125 micron glass beads in 5.5 cm dia pipe upto 50% by volume concentration and 5m/s velocity. Centrifugal slurry pump was used for maintaining the flow in 30 m long recirculating pipe loop. Results of this study are published in following paper:
http://dx.doi.org/10.1016/j.powtec.2006.11.020
Most recently I am able to reproduce my experimental results using CFD modeling. I hope this may be of some help to you.
Regards
D.R. Kaushal ■
70% Copper Slurry
Dear Gentlemen:
I've been looking for models to calculate head losses and critical velocity. But the slurry has 70% of milled copper of 400 tyler or 40 micrometers diameter. Fluid is water.
The idea is to use a centrifugal pump to convey the slurry.
Unfortunatly, all models and enpirical data i've found cannot be applied to such high concentrations.
does anyone knows wath correlations or references can i apply?
any practical experience with such conditions?
Thaks for your hep!
regards
Leonardo Verdugo ■