With paper silver recovery is usually just burn it and then put the ash in a furnace with flux to melt and recover the silver. With film it's rehalogenate with Ferric Chloride, the fix, pass the fixer through an electrolytic unit to plate out the silver, you can keep reusing the silver for quite a while, eventually the fixer goes through wire woll to take out silver to below 4ppm.
I worked in precious metal recovery for nearly 30 years, the company I worked for last was founded 260 years ago - they claim - actually that's how long the family has been in the trade but my boss saw his inherited company go bust in the Bunker Hunt crisis, it exists under different ownership. He set up an entirely new company.
Ironically it was Kodak, Ilford, Agfa and Fuji who were that main creditors the company did did all the silver recovery. as the Silver price plummeted the photo companies wanted their money not the worthless silver
Ian