All kind time of day! I'm new here. I want to make my 5 cents. I am engaged in processing of films of 11 years, recently for extraction of silver from a film I use: fixing (thank God, medical x-ray in Russia not yet everywhere digital). The process is this: the film (x-ray, film,) was milled with a mill of 1.5 *1.5 cm, cover in polypropylene woven bags (15 kg), and placed these in plastic bags capacity 1 cubic meter (fits 18 bags). Then I fill with a solution of ferric chlorid. After 15 minutes, when the silver film passes into AgCl, I drain the solution Fecl3, rinse the film with water once (700 liters), and pour a solution of medical untreated fixation (0.7 - 3 grams Ag/liter), several times pumped through the film fix, and let the lock on electrolysis. The overflow from the device goes back to the container with a film, and so in a circle until the complete extraction of silver. Solution FeCl3 and fix after removing the silver is not drained into the sewer, it can be reused several times