Hmmm where to start
When an opponent shouts something like āABSOLUTELY NOT TRUEā and āABSOLUTELY FALSE &/or MIS-INFORMATIONā or "B.S." (which is actually very impolite)
I guess I will start here
When I use caps &/or bold print it is not because I am shouting - it is because I am stressing a point in part of the discussion
If I was shouting I would hit the "cap lock" & my entire post would be in caps
with 100% confidence, he must be ready to confirm his words
And kurtak's behavior was self-confident
Yes - there is no question about it - I am
VERY confident in my points about cementation & 100% confident or I would not be stressing my point(s) with caps & bold print
he must be ready to confirm his words with numerical data from verified and authoritative scientific sources.
Can you do it?
Provide any three verified scientific references (other than your personal opinion) on the rate of copper cementation of noble metals from chloride solutions.
I do not need to waste my time "looking for" authoritative scientific papers on this matter of cementation (actually ion exchange)
I have something MUCH better then that to prove my point(s) about cementation without the need to go "looking for" papers on the matter -
& do so with 100% certainty
It is call 10 years of ACTUAL EXPERIENCE working in the recovery & refining of PMs
for a living
To give you an idea of my "real life" experience - I used to buy my 57% nitric in 55 gallon drums & my 68% nitric in 15 gallon kegs (we can convert that to liters - if we want to get "scientific")
That should give you at least some idea of how much metal(s) I was putting into solution --- it certainly was not a back yard hobby hack dissolving a few grams of metal(s) kind of operation
And I can tell you this -
as a MATTER OF FACT
Cementation played a
major roll in the success of my "making a living" in the recovery & refining of PMs
Somewhere - almost daily - if not daily - cementation was taking place in my operation of PM recovery/refining
Cementation such as -----------
1) anything from 1 or two 35 gallon drums with copper to cement those last traces of PMs left behind from chemical precipitation ---&/or 1 to three 55 gallon drums with iron to recover (cement) the copper after PM/copper cementation
2) or cementing 10 - 20 liters of solution heavy contaminated with base metals AND lots of excess oxidizer in them as a result of leach things like ceramic CPUs or the IC chip ash concentrates from 100 - 150 batches of epoxy IC chips
3) or cementing 30 - 50 kilo batches of silver to upgrade it for running in the silver cell - or use the silver cement for a collector metal in my smelting operation
4) cementing PGMs as recovery after dropping gold - or PGM recovery from catalyst (Pd/Pt/Rh) so the PGMs can then go to actual chemical refining/separation
5) and yes - even using cementing to turn out 999 plus metals
And this is what I can tell you -
with 100% certainty - after "employing" cementation almost daily (if not daily) in my operation
With cementation you can get ABSOLUTELY 100% recover of your PMs --- that is why - until the development of resins - cementing is what many LARGE refiners used to recover the TRACES of PMs left behind after chemical precipitation
I can also tell you that it ABSOLUTELY -
DOES NOT - take days - to cement the PMs from solution - with 100% recovery --- it can
IN FACT be done in hours - ranging from an hour (even less) to a full 8 hour day - depending on the situation --- in fact - just yesterday I cemented about a gram of gold from a test solution & it only took about 15 minutes
The
ONLY real exception to this (short time needed for cementing) is in the case of cementing the TRACE PMs from solutions after chemical precipitation in which case you should let the cementation run for "at least" 24 hours & up to 2 or 3 days - mostly dependent on whether you are cementing a 5 gallon (20 liter) bucket of solution - or a 55 gallon drum of solution
The reason for the "extended" time for cementing in this case is because the solutions are
VERY dilute to start with - dilute first in the very few numbers of PM ions in the solution (after chemical precipitation) - & then even more diluted in the washing out of the chem from the sponge after chemical precipitation
Provide any three verified scientific references (other than your personal opinion)
So - I most certainly do not need to provide you with scientific references to prove my point - nor is what I am telling you
just a matter of my opinion
It is a MATTER OF FACT - with100% certainty - verified - by the almost daily (if not daily) employment of cementation in my (about) 10 years of making a living at the recovery & refining of PMs
Your turn
Kurt
- and what's worse is that the excess sulfamic (and a bit of lead) are now crystallized around the top of the solution, as well as a pile on the bottom of the beaker. The stannous test shows NO GOLD IN SOLUTION!!! 
