Vacuum Pump

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jmdlcar

Well-known member
Joined
Jul 19, 2011
Messages
849
Location
Ohio
I order one and I receive it today.
https://www.ebay.com/itm/Eisco-Labs-Filter-Flask-Borosilicate-1000mL/272039620578?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

But can I use this to pull down a vacuum to filter Silver power?
https://www.ebay.com/itm/Hand-Held-Vacuum-Pressure-Pump-Tester-Set-Brake-Fluid-Bleeder-Bleeding-Kit-Box/124347524908?hash=item1cf3b0a72c:g:JIUAAOSw-RJfaXkE

I won't be doing much more then 200 grams of Sterling Silver at a time so I won't need a big vacuum pump.
 
I've never used a hand pump but I don't see why it wouldn't work. You do not need a very high vacuum, the filtering speed will vary depending on the vacuum you generate. Let the fluid rest before filtering it so that the sediments settle to the bottom, and then remove the liquid by siphoning it. This way you avoid clogging the filter and making the filtering harder.

Nacho
 
The brake bleeder hand pump in your second link will suffice for vacuum filtering on a small scale.

Many, many years ago, when I was first experimenting with refining, I converted an old Vac-U-Form toy (anybody else remember those?) as my vacuum source. It was very crude, but it worked.

Dave
 
FrugalRefiner said:
The brake bleeder hand pump in your second link will suffice for vacuum filtering on a small scale.

Many, many years ago, when I was first experimenting with refining, I converted an old Vac-U-Form toy (anybody else remember those?) as my vacuum source. It was very crude, but it worked.

Dave

When i started back in the first days of the forum i used a small air pump for a vacuum source. On one side you have suction where it draws air in and on the other you have pressure going out.
 
If I have to keep pumping it. I found this.
https://www.ebay.com/itm/Small-Lab-Vacuum-Pump-20-30-kPa-80-120-H20-3-4-PSI/254571237634?hash=item3b45a0d102:g:2mkAAOSwz8temMx9

Is that better idea?
 
https://www.ebay.com/itm/3-5CFM-Deep-Vacuum-Pump-Rotary-Vane-1-4HP-AC-110V-R410a-R134-HVAC-Refrigerant/383677919098?hash=item5954fc6f7a:g:2Q4AAOSwPWRgAmEg
 
I have found the KNF™ Chemically Resistant Vacuum Pumps to be very good.
New they are over £1000 but keep your eyes open, and I picked my two up for under £100 each.
A little bit of an investment, but they work well for years and don't dissolve.
 
I bought two vacuum pumps in my first 4 years. They lasted about 2 years each.
Then i bought the exact same pump again as the first two. $60 every two years is just an expense to me.
Then on the 3rd one i bought i discovered something! I ran out of pump oil one day and didn't have anymore so i topped it off with the used motor oil i drain from my car. That 3rd pump has been going strong for almost 10 years now and still going strong. Something about the used oil and i guess the carbon that's in it that seems to protect the pump better! Used oil is all i use in that pump and all i will use ever in my pumps!
 
I used one of these for a long time.

https://www.harborfreight.com/multi-use-transfer-pump-63144.html

When my material outgrew it, I went with one of these. It is now two years old and still working fine. Then I don't run near the material Palladium does, :D However I do run motor oil in mine as well, again from his past advice as well.

https://www.harborfreight.com/25-cfm-vacuum-pump-61245.html
 
Well I think I will go with this one 2 In 1 Brake Bleeder & Vacuum Pump Gauge Test Tuner Kit Tools DIY Hand Tools Hot because I will only process about every 3 or 4 month since I am on SS. If I fine Sterling Silver in yard sale or where ever I can get it.
 
If you are only doing small amounts occasionally then why not use a water driven Venturi cheap and easy to set up.
 
I also use a water driven venturi to skim siphon waste solutions, vacuum destil and scrub fumes. Made it from a plastic T splitter. https://goldrefiningforum.com/phpBB3/viewtopic.php?f=69&t=21371
It consumes a lot of water if you use tap water pressure. A small tank with a membrane pump to feed the venturi will eliminate that. These pumps create more pressure, giving a deeper vacuum. A by-pass valve over the pump inlet and outlet or a bleed valve on the outlet gives a good control over the vacuum.

Some aquarium air pumps have rubber flap checkvalves in them which you can turn around, turning it into a suction pump in stead of a blower.

I have never used a buchnel vacuum funnel to filter, just time.

Martijn.
 
nickvc said:
If you are only doing small amounts occasionally then why not use a water driven Venturi cheap and easy to set up.

I have a catch-all outside my filter shed on the output of my pump.
Even being careful a little value get through the system and turns up in that barrel.
A Venturi aspirator will pull every thing down the drain.
Only small amounts of spent liquor most of the time, but it would have the potential to lose value down the drain as well.
 
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