The silver sulfate can be crystallized out by slowly diluting the cooled acid to less than 30%. The crystals can be collected and washed. I have cemented them with transformer iron and that worked well. There will be silver sulfate still in the acid and the wash solution which can be recovered on copper.
This is a dangerous procedure, as has been noted before. The hot acid will spatter and spray, even explode, if any amount of water gets in it. This acid spray could very easily disfigure, blind or cause death. If the container were to to spill on you it would be truly horrific. If the reaction vessel broke, the acid could react strongly, even violently with your heating setup, the counter, the damp or wet ground or concrete, metals, organic matter and who knows what else. The fumes didn't seem to be very heavy when I did it, but that might depend on exact temperature and concentrations, a fume cabinet or outdoors is mandatory in any case.
If you died or became incapacitated from a something either related or unrelated while doing this process, would your setup become more or less dangerous from lack of tending? Would the next person be able to recognize and deal with the dangers? I hope this is good food for thought for those who may be considering doing this. The worst part is it is really easy to do. The dangers are numerous, it would be easy for anyone to overlook something potentially disasterous.
