Search results for query: ap

...it is a set it and forget it process. Then you can work on what ever else you do in the mean time. One important thing with both the Nitric and AP process is that the sheets ned a separation so the acid can contact the whole sheets. When it goes for yield it is a risk that pregnant AR can be...

HCl does not dissolve copper or other base metals from brass or bronze. And you just spent a lot of time to put copper in solution to separate it from the pm's. Cementing it all back out sets you back to having a mix of copper, base metals and pm's. Which is a waste of time and chemicals.

This is a very good point. Theoretically, wouldnt HCl bath prior to ap/ar treatment dissolve most of the base metals? Ive beej reading Hokes book and this also has been mentioned. I have been doing HCl baths before anything else. Ive cemented copper and it looks to be relatively pure. If i ever...

...As the gold goes into solution the copper ( or base metal) on the boards cement it back out. This is very fine powders so fine that the gold appears brown. Due to particle size it does not reflect light so we don’t see the yellow gold but only brown dust. This repeats itself until there are...

...it alone, with a bit of time. HCl two parts to one part water will do the job. If peroxide is needed at all per gallon of HCl only use one to two cap’s full. You only need to convert the copper to AP, or what is actually copper(ll)chloride. If the forum is well researched on this CuCl2, there...

Many use Cupric Chloride aka AP on GF and it works well as far as I understand. Slower than Nitric but much cheaper and forgiving.

I've actually been trying all kinds of recovery, trying to find the most suitable. The solid pins, I disolved base metals with nitric, the disolved foils in AR. That was very time consuming and used a lot of nitric for a small return. The pogo barrels went into copper(2)chloride leach and took a...

Some PCBs ar full plated with gold specially RF telecom boards, when use AP or nitric to get gold foils I got less amount of gold, so I prefer to dissolve everything to better results.

This is good advice. Thanks. I did label everything except the sulfuric acid and at 2am I made the mistake of pouring it into my AP waste and went to bed. No more late night chemistry for me :) I'm going to neutralize, use iron to drop metals, filter and dispose of solutions. Re-refine the...

...of a screenshot why did you not post the link so we could see the development of the thread and age as well. There has been a development here, the reason it is called AP is the in the beginning we actually used Peroxide. Today we really do not recommend using Peroxide but rather corroded Copper.

...times for segregation. I was wondering if you could elaborate a bit more on the chemical processes as I am keen on understanding my precious metal recovery from the product I have for better understanding of financial feasibility and better pricing on these PCBs. I would appreciate any...

Dude, this has occurred to the letter...the brown sands are present thanks for tip.

...boards) then the easy way to strip them is start with hot water and LYE solution - this will remove the green solder mask / epoxy. I then do an AP soak for a while (weeks), then wash all the boards in clean water. some scrubbing will usually remove all of the gold trace, then it's into AP...

Why do you want to use Nitric on something that is stripped already? And the exceedingly few boards with this much Gold will be better treated in AP directly. Maybe Nitric directly if the amount of solder is not excessive.

Dissolving copper to free Gold foils using only what i have available, also most of it i get for free both chemicals and materials. Only think i got unlimited is time. Waste is welcome some will go to geology students to grow Crystals, some to our students to be turned back into copper and...

Another good example on the topic of asking a simple question and getting a simple answer.

This dark color is why pins don’t work very well in AP. It uses up large amounts of oxygen on base metals. This is also part of why it is used on fingers, and very clean boards of the right type, it works best on the finger/ board materials. It is also best to use a large excess of HCl for AP...

...of the light brown sands...!! Thanks for the tip. The filters are golden brown-yellow with a grey paste (tin)?. I am filtering half of the AP to drop for any dissolved gold that have remained in solution (small experiment), and using the other half again on stubborn components with bubbler...

Hello All, I have some questions regarding the AP solution where I am using HCl with 34% H2O2. The media that I am processing are trimmed fingers from obsolete RAM and GPUs, and scrapped out clean (free of components and solder)PCMBs. The solution does a great job of removing the gold from...

Hello Stewill, That’s an impressive amount of RAM fingers. I’m curious—how much 24k gold were you able to recover from this batch? I’m about to begin refining with 2 lbs of material and would like to gauge whether it will be profitable or if it’s more suited as a hobby.

The golden ratio is no Peroxide. Use an aquarium bubbler and bubble air through the HCl.

Copper chloride significantly catalyzes the reaction of dissolving gold in chloride solutions.

Mainly HCl and H2SO4, because nitric has no place in waste solutions. (should you still have nitric in your waste, then it's not waste! ;) ) We do not use many other acids in gold and silver refining. The best way for me is soda to create hydroxides and neutralize the acids. Lime also works.

...that this was the most easiest (known) method as well. Pyrolysis is something I have thought about a lot but it's insanely difficult to build and apparently very dangerous. Incineration is possible but then I create some other more difficult problems with authorities here. I am more looking...

I'm OK with removing base metal pieces from gold filled scrap. Just be sure to rinse them thoroughly into a separate container and keep the rinses for any gold that may have cemented out on the base metals. You can add them to the gold foils you get at the end of the AP process. If you have...

Yep...I made that mistake when I first started (2014). Fortunately, I didn't have very much in the garage at the time, so damage was pretty limited. Hydrochloric fumes are pervasive and persistent.... no matter how much cleaning and ventilation you do, stuff will continue to rust for months...

Hi That last AP was a mess...a mixture of vinegar and peroxide... Bottled and neutralised.. I agree there may be no platinum, although solution went from yellow to breakfast orange juice colour after application of SMB. [with these failed attempts I neutralise with baking soda and store] We...

How do you treat those large amounts of waste acids?

Green is fresh good copper 2 chloride, darker is more copper 1 chloride. When that gets saturated, it precipitates out as white slimy gelly stuff. You want it to be green, not dark.

As with most chemistry questions. Yes and No, depending on conditions. I’m away and using my phone now so it is not the best for replies. If you want to recover all, forget chemistry and simple. Definitely forget easy and cheap. It WILL get complicated and expensive.