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Hey guys , I looked around and didn't see anything . I got access to a lot of bx cable. . I was wondering what the recovery rate . So I used dr coppers method cut a piece weighed it and stripped the wire. Divided copper weight by gross weight . And I got 17% copper recovery rate. I feel like that's not right is it really that low. What do you guys think ?
That seems a little low, for sure. What kind of BX cable was it? 2 conductor with a bare ground wire? What is the wire size? (no. 14 is pretty common--its 0.064" diameter, which is just about exactly 1/16" in diameter. Is the metal jacket aluminum or steel? If aluminum, its worth some money, too. I would expect a recovery in the 30% range. Is it a specialty BX that maybe has Ethernet cable or some kind of very small control cable? If that is the case your recovery would be very low.
Did you do a decent sample size? It depends on your scale--if it only reads to a 1/2 lb, you will need a big sample to get any accuracy. When I did samples like this, I used a scale good to 1/100lb (0.01lb) and used samples about 18" long.
Just to confirm the % recovery method:
(% copper recovery) = (wt. of bare copper wire from sample) divided by (total sample weight)
(% aluminum recovery) = (wt of bare aluminum jacket from sample) divided by (total sample weight)
(% insulation recovery) = (wt of insulation, paper, etc from sample) divided by (total sample weight)
The percentage of copper + aluminum + insulation should add up to 100%.
Another detail to consider is who you sell it to. A yard with a granulator that can separate aluminum from copper will eat this stuff up very easily and, in theory at least, should be paying you the best for your product. YMMV.
Hope this helps!
Jon.
I think that Highvoltageprocessing had mentioned this during one of his posts.
i mean the steel bx is heavy and only had two wires . but the aluminum bx has 3 wires in it and of course is lighter.